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Published in final edited form as:
J Neurolinguistics. 2009 January 1; 22(1): 91–108. doi:10.1016/j.jneuroling.2008.07.001.
Knowledge of the Semantic Constraints on Adjective Order Can
Be Selectively Impaired
David Kemmerer1,2,3, Daniel Tranel3, and Cynthia Zdanczyk2
1 Department of Speech, Language, and Hearing Sciences, Purdue University
2
Department of Psychological Sciences, Purdue University
3
Department of Neurology, Division of Behavioral Neurology and Cognitive Neuroscience,
University of Iowa College of Medicine
Abstract
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When multiple adjectives are used to modify a noun, they tend to be sequenced in the following way
according to semantic class: value > size > dimension > various physical properties > color. To
investigate the neural substrates of these semantic constraints on adjective order, we administered a
battery of three tests to 34 brain-damaged patients and 19 healthy participants. Six patients manifested
the following performance profile. First, they failed a test that required them to discriminate between
semantically determined correct and incorrect sequences of adjectives—e.g., thick blue towel vs.
*blue thick towel. Second, they passed a test that assessed their knowledge of two purely syntactic
aspects of adjective order—specifically, that adjectives can precede nouns, and that adjectives can
precede other adjectives. Finally, they also passed a test that assessed their knowledge of the
categorical (i.e., class-level) features of adjective meanings that interact with the semantic constraints
underlying adjective order—e.g., that thick is a dimensional adjective and that blue is a color
adjective. Taken together, these behavioral findings suggest that the six patients have selectively
impaired knowledge of the abstract principles that determine how different semantic classes of
adjectives are typically mapped onto different syntactic positions in NPs. To identify the
neuroanatomical lesion patterns that tend to correlate with defective processing of adjective order,
we combined lesion data from the six patients just described with lesion data from six other patients
who we reported in a previous study as having similar impairments [Kemmerer, D. (2000). Selective
impairment of knowledge underlying adjective order: Evidence for the autonomy of grammatical
semantics. Journal of Neurolinguistics, 13, 57–82.] We found that the most common areas of damage
included the left posterior inferior frontal gyrus and the left inferior parietal lobule. Overall, these
results shed new light on the neural substrates of the syntax-semantics interface.
Keywords
adjective; syntax-semantics interface; iconicity; Broca’s area; inferior parietal lobule
Address for correspondence: David Kemmerer, Department of Speech, Language, and Hearing Sciences, 1353 Heavilon Hall, Purdue
University, West Lafayette, IN 47907-1353, Phone: (765) 494-3826, Fax: (765) 494-0771, kemmerer@purdue.edu.
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1. INTRODUCTION
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English speakers have strong intuitions about the grammaticality of adjective sequences that
precede nouns. For example, a fine black stallion sounds natural, but *a black fine stallion
sounds odd. Research on this topic suggests that when multiple descriptive adjectives are strung
together before a noun without being linked by coordinators, and also without contrastive
intonation, the following linear precedence of semantic classes tends to apply: value > size >
dimension > various physical properties > color (Table 1; Bache, 1978;Bache & DavidsenNielsen, 1997;Dixon, 1982;Quirk et al., 1985). It has been argued that this hierarchy reflects
a set of principles which together entail that adjectives that denote objective, absolute, inherent
properties of entities, like color (e.g., black), tend to occur closer to the modified noun than
adjectives that denote subjective, relativistic, context-sensitive properties, like value (e.g.,
fine; Frawley, 1992;Hetzron, 1978;Martin, 1969a,1969b;Martin & Ferb, 1973;Richards,
1975; for further elaboration see the General Discussion). But even apart from such austere
principles, it is apparent that the semantic constraints underlying adjective order must involve
fairly abstract notions. Consider, for instance, the following contrast: a thick blue towel vs.
*a blue thick towel. The rules that determine which sequence of adjectives is correct are
sensitive to the fact that thick is a dimensional adjective whereas blue is a color adjective;
however, they are not sensitive to the idiosyncratic semantic features that distinguish between
different dimensional adjectives (e.g., thick vs. thin) or between different color adjectives (e.g.,
blue vs. green), as shown by the following contrast which parallels the previous one: a thin
green towel vs. *a green thin towel. In other words, general concepts like “dimension” and
“color” are relevant to adjective order, but more specific concepts like “thick”/“thin” and
“blue”/“green” are not (see Figure 1).
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In earlier work, we conducted a neuropsychological investigation which obtained preliminary
evidence suggesting that knowledge and/or processing of the semantic constraints underlying
adjective order can be selectively impaired by focal brain lesions (Kemmerer, 2000). In
particular, of 16 left-hemisphere-damaged patients who were studied, six manifested the
following performance profile. On the one hand, they failed a grammaticality judgment task
that required them to discriminate between correct and incorrect sequences of adjectives. On
the other hand, they performed normally on a grammaticality judgment task that probed their
knowledge of the following two purely syntactic aspects of adjective order: first, that adjectives
can precede nouns; and second, that adjectives can precede other adjectives. Thus, the patients
apparently lost their appreciation of how adjectives can be sequenced within noun phrases, but
retained their appreciation that adjectives can be sequenced within noun phrases. In addition,
the patients performed normally on a third task that evaluated their knowledge of idiosyncratic
semantic features of adjectives—i.e., features that are irrelevant to adjective order. The entire
pattern of results suggested that the patients’ lesions selectively disrupted their understanding
of the abstract principles that govern the relative positional tendencies of different semantic
classes of adjectives.
Kemmerer’s (2000) investigation has several limitations, however. First, the behavioral data
are actually consistent with two different interpretations. As noted above, one possibility is
that the patients’ impairments affected specifically their knowledge and/or processing of the
semantic constraints on adjective order—e.g., that dimensional adjectives like thick and thin
typically precede color adjectives like blue and green (see the reference to constraints in the
top portion of Figure 1). But an alternative possibility is that the patients’ impairments affected
specifically their knowledge and/or processing of the categorical (i.e., class-level) features of
adjective meanings that interact with those constraints—e.g., that thick and thin both encode
the general concept of “dimension,” and that blue and green both encode the general concept
of “color” (see the reference to syntactically relevant categorical semantic features of adjectives
in the bottom portion of Figure 1). Another limitation of the study is that the neuroanatomical
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correlates of the patients’ deficits were not characterized precisely. It was indicated that among
the six patients of interest, four had left perisylvian lesions (with mixed combinations of
involvement of frontal, temporal, and parietal sectors), one had a left lateral orbitofrontal lesion,
and one had a left superior parietal lesion. But a more precise neuroanatomical analysis was
not undertaken.
In this paper we report a new study that addresses both of the previous study’s limitations.
First, we provide in a new set of patients more detailed and compelling evidence that knowledge
of the semantic constraints on adjective order can in fact be selectively impaired; and second,
we investigate in greater depth the types of neuroanatomical lesion patterns that tend to
correlate with defective processing of adjective order.
2. NEUROPSYCHOLOGICAL STUDY
2.1. Participants
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The brain-damaged participants were 34 individuals with unilateral left (N=21), right (N=11),
or bilateral (N=2) hemisphere lesions, selected from the Iowa Cognitive Neuroscience Patient
Registry of the University of Iowa’s Division of Behavioral Neurology and Cognitive
Neuroscience. (None of these patients had participated in the study reported by Kemmerer
(2000).) All of them gave informed consent in accordance with the Human Subjects Committee
of the University of Iowa and federal regulations. The patients’ lesions were caused by either
cerebrovascular disease (N=19), temporal lobectomy (N=9), anoxia (N=1), or surgical
resection of either benign tumor (N=3) or abcess (N=2). All of the patients have been
extensively characterized neuropsychologically and neuroanatomically, according to standard
protocols (Damasio & Frank, 1992; Frank et al., 1997; Tranel, 2007). Some of the patients
were recovered aphasics, and some had moderately severe residual aphasia; however, none
had aphasia of such a degree as to preclude their comprehension of the experimental tasks. We
excluded patients who could not comprehend the tasks, or who had any difficulty understanding
the content of the queries used in the tasks (one patient with global aphasia was excluded on
this basis, prior to forming the group of 34 noted above). All data were obtained in the chronic
phase, when patients were at least three months post lesion onset. The patients had the following
general demographic characteristics: age (M=50.6 years, SD=14.9 years); education (M=14.1
years, SD=2.3 years); gender (17 men, 17 women); racial composition (100% white).
Handedness, measured with the Geschwind-Oldfield Questionnaire (Oldfield, 1971) which has
scale ranging from full right-handedness (+100) to full left handedness (−100), was distributed
as follows: 23 patients were fully right-handed (+90 or greater), five were primarily righthanded (2 @ +80, 1 @ +75, 1 @ +75, 1 @ +55), 5 were fully left-handed (−100), and 1 was
primarily left-handed (−80).
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A comparison group of normal participants was also studied. These were 19 persons who were
selected so as to be free of neurological or psychiatric disease yet closely matched with the
brain-damaged patients in terms of both age and education. They had the following general
demographic characteristics: age (M=50.3 years, SD=5.7 years); education (M=15.1 years,
SD=1.4 years); gender (5 men, 14 women); racial composition (100% white); handedness (15
fully right-handed, 2 primarily right-handed, 2 fully left-handed). All of the normal participants
gave informed consent in accordance with the Human Subjects Committee of Purdue
University and federal regulations. They participated in the experiment on a voluntary basis
and were financially compensated for their time.
2.2. Methods
2.2.1. Task 1: Adjective Syntax (Semantically Constrained)—Task 1 was designed
to evaluate knowledge and processing of the semantic constraints on adjective order (see the
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reference to constraints in the top portion of Figure 1). The stimuli consisted of 70 pairs of
sentences. The sentences comprising each pair had the same type of syntactic structure: a
subject noun phrase (e.g., The woman) followed by a past-tense verb (e.g., bought) followed
by a direct object noun phrase containing an indefinite determiner, two adjectives, and a head
noun (e.g., a thick blue towel). The two sentences in each pair differed only with respect to the
linear order of the two adjectives, with one sentence having the correct order (e.g., thick
blue) and the other sentence having the incorrect order (e.g., *blue thick). Of the 70 sentence
pairs, 60 consisted of 6 instances of each the 10 subtypes of adjective order shown in Table 1.
The remaining 10 sentence pairs contained a different subtype of adjective order called “color
+ material” (e.g., Mrs. Jones bought a white silk scarf vs. *Mrs. Jones bought a silk white
scarf). These items were included because, unlike all of the other subtypes of adjective order
that involve color adjectives, they represent instances in which color adjectives are not
preferred in the syntactic slot closest to the modified noun (Bache, 1978;Bache & DavidsenNielsen, 1997;Quirk et al., 1985). All 70 sentence pairs are shown in Appendix A.
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For the first 60 sentence pairs, the adjectives occupying first and second position in the normal
sequences were not significantly different in either word frequency per million (first position:
M=159.7, SD=191.6; second position: M=148.1, SD=218.7; p=0.33; Francis & Kucera,
1982) or letter length (first position: M=4.9, SD=1.2; second position: M=4.9, SD=1.3;
p=0.39). Because the reversed sequences contained exactly the same adjectives as the normal
sequences, only with their linear order switched, the adjectives occupying first and second
position were also controlled for both frequency and length. The normal and reversed adjective
sequences used in this task were drawn from a larger set of sequences for which naturalness
judgments had been previously obtained in an experiment with 72 healthy college students
who participated in exchange for credit in an introductory psychology course (age: M=19.2
years, SD=1.8 years; gender: 34 male, 38 female). These participants rated each adjective
sequence on a scale from 1 (very bad) to 5 (very good). The average ratings for the 60 normal
sequences and the 60 reversed sequences that were ultimately selected for inclusion in Task 1
fell near the extreme ends of the scale (normal: M=4.0, SD=1.4; reversed: M=1.7, SD=0.3; see
Appendix A for details; see also Kemmerer et al., 2007).
The 70 sentence pairs were presented to participants in list form, printed in Times 16-point
font on 8.5 × 11 inch pages, with 10 sentence pairs per page and each pair labeled A and B.
The two adjectives in each sentence were always underlined. For example:
A. Mr. Smith wore an ugly yellow hat.
B. Mr. Smith wore a yellow ugly hat.
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For each pair of sentences, the participant’s task was to indicate which one—A or B—contained
the more natural adjective order. The correct sentences were distributed evenly across the A
and B positions, except the A or B sentence could not be consistently correct for more than
three consecutive items. In addition, the progression of adjective order subtypes was
randomized across the items, with the proviso that no more than two items involving the same
subtype could occur consecutively. Finally, one practice item was provided at the outset of the
task so as to familiarize the participant with the nature of the materials and make sure they
understood the task.
2.2.2. Task 2: Adjective Syntax (Semantically Unconstrained)—Task 2 was
designed to evaluate knowledge and processing of certain semantically unconstrained aspects
of adjective order—most importantly, that adjectives can precede nouns, and that adjectives
can precede other adjectives (see the reference to syntax in the top portion of Figure 1). The
same task was also employed by Kemmerer (2000), and additional methodological details are
provided in that paper. Briefly, the materials consisted of 15 pairs of NPs. Each pair varied
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only in the linear order of lexical items, with one version being perfectly grammatical and the
other being ungrammatical due to a violation of purely syntactic rules. There were three
subtypes of noun phrase pairs, with five instances of each subtype. The specific subtypes were
as follows: (1) “adjective + noun” (e.g., big field vs. *field big); (2) “adjective + adjective +
noun” (e.g., warm sweet air vs. *air sweet warm); and (3) “determiner + adjective + adjective
+ noun” (e.g., a hilly bumpy road vs. *road bumpy hilly a). Note that for subtypes 2 and 3, all
of the adjectives were from the same class—namely, “various physical properties”—and their
relative order was not semantically constrained (Bache, 1978;Bache & Davidsen-Nielsen,
1997). For example, warm sweet air and sweet warm air are both acceptable, although *air
sweet warm and *air warm sweet are both clearly unacceptable. All 15 pairs of noun phrases
are shown in Appendix B. The items were presented to participants in list form, printed in
Times 16-point font on 8.5 × 11 inch pages, with the two noun phrases comprising each pair
labeled A and B. For each pair of noun phrases, the participant’s task was to indicate which
one—A or B—had the more natural order. The correct answer was A for eight items and B for
seven items. All items were randomized. Finally, one practice item was provided at the outset
of the task so as to familiarize the participant with the nature of the materials and make sure
they understood the task.
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2.2.3. Task 3: Adjective Semantics (Categorical Similarities)—Task 3 was designed
to evaluate knowledge and processing of the categorical (i.e., class-level) semantic features of
adjectives that are most relevant to the abstract principles that determine how adjectives are
normally sequenced relative to each other (see the reference to syntactically relevant
categorical semantic features in the bottom portion of Figure 1). We took into consideration
the following five general concepts, which define the five classes of adjectives whose ordering
tendencies are the focus of Task 1: “value,” “size,” “dimension,” “various physical
properties” (such as texture, temperature, and weight), and “color.” The stimuli consisted of
25 triads of adjectives, five for each of the five general concepts just mentioned. For each triad,
one adjective served as the pivot and two others served as alternative choices, with the task
being to identify which of the two latter adjectives is more similar in meaning to the pivot. The
pertinent similarity metric, which the participant needed to discern in order to perform well,
always hinged on one of the general concepts of interest. For example, for one item the
participant must decide whether gigantic or heavy is more similar in meaning to huge. This
particular item probes the participant’s sensitivity to the “size” feature that is shared by
gigantic and huge. Across the 25 items, the following three types of semantic relation were
used to link the pivot and target adjectives via a shared general concept: synonymy (e.g.,
gigantic and huge), antonymy (e.g., deep and shallow), and cohyponymy (e.g., red and
green) (Cruse, 2000;Deese, 1964;Gross, Fischer, & Miller, 1989). All of the items are shown
in Appendix C. The items were presented to participants in list form, printed in Times 16-point
font on 8.5 × 11 inch pages, with each pivot appearing in upper case font on the left side of the
page, and the two corresponding choice adjectives appearing to the right of the pivot in lower
case font. The correct answer was the first adjective for 12 items and the second adjective for
13 items. All items were randomized. Finally, one practice item was provided at the outset of
the task so as to familiarize the participant with the nature of the materials and make sure they
understood the task.
2.3. Results and Discussion
On average, both groups of participants achieved high levels of performance on all three tasks
(Table 2). However, seven brain-damaged patients were significantly impaired on Task 1—
i.e., they obtained scores that were greater than two standard deviations below the mean for
the normal participants (Table 3). Of these seven patients, one (3297) was also mildly impaired
on Task 2 and severely impaired on Task 3, with the cutoff for impairment on either task being
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set at ≤90% correct (due to the fact that the normal participants performed at ceiling on both
tasks). In contrast, the other six patients performed quite well on Tasks 2 and 3.
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To determine whether performance on Task 1 was influenced by certain item-specific
properties of the stimuli, we conducted the following analyses. First, we calculated the
correlation coefficient between, on the one hand, the average percentage correct for each item,
and on the other, the average frequency of the two adjectives in each item. For the seven braindamaged patients who failed Task 1, r = −.139 (r2 = −.019), and for the 19 normal participants,
r = −.116 (r2 = −.013). These findings indicate that performance was not significantly affected
by frequency. Second, we calculated the correlation coefficient between, on the one hand, the
average percentage correct for each item, and on the other, the difference for each item between
the average naturalness rating received by the correct adjective sequence and the average
naturalness rating received by the incorrect adjective sequence (Appendix A lists these ratings,
which, as described in section 2.2.1, were provided by 72 healthy college students). For the
seven brain-damaged patients, r = .404 (r2 = .163), and for the 19 normal participants, r = .601
(r2 = .360). These findings indicate that performance was moderately influenced by how easily
the correct and incorrect adjective sequences comprising each item could be discriminated. For
example, the item with the largest rating difference (3.4)—namely, Melissa drove a big orange
truck (4.9) vs. *Melissa drove an orange big truck (1.5)—elicited an average score of 86%
correct from the seven brain-damaged patients and 100% correct from the 19 normal
participants. Conversely, the item with the smallest rating difference (1.3)—namely, Jill saw
a gorgeous giant sunflower (3.8) vs. *Jill saw a giant gorgeous sunflower (2.5)—elicited an
average score of 57% correct from the seven brain-damaged patients and 85% correct from the
19 normal participants. Overall, then, it is clear that the rating factor is important; however, it
is also apparent that this factor can only explain a relatively small fraction of the total variability
in the subjects’ performance.
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The seven brain-damaged patients who failed Task 1 manifested very different performance
profiles across the multiple subtypes of adjective order, and the 19 normal participants also
exhibited a wide range of average scores across the subtypes (Table 4). Similar variability was
reported by Kemmerer (2000). To determine whether performance tended to be worse for more
difficult subtypes, we calculated the correlation coefficient between the average percentage
correct and the average rating difference for each subtype. For the seven brain-damaged
patients, r = .421 (r2 = .177), and for the 19 normal participants, r = .781 (r2 = .610). These
findings reveal a fairly strong relationship between accuracy and difficulty at the level of
adjective order subtypes. For example, the “size + color” subtype contained the most easily
discriminable correct and incorrect adjective sequences, with an average rating difference of
3.4, and this subtype accordingly elicited relatively high accuracies from both the seven braindamaged patients (mean = 80.9%) and the 19 normal participants (mean = 98.3%). Conversely,
the “value + size” subtype contained the least discriminable correct and incorrect adjective
sequences, with an average rating difference of 1.9, and this subtype accordingly elicited
relatively low accuracies from both the seven brain-damaged patients (mean = 59.3%) and the
19 normal participants (mean = 83.0%). It is noteworthy, however, that, as mentioned above,
even though the rating factor is undoubtedly important, it cannot account for all of the data.
From a theoretical perspective, the most interesting cases are the six brain-damaged patients
who only failed Task 1. The fact that these patients obtained high scores on Task 2 constitutes
evidence that their poor performance on Task 1 was not due to disrupted understanding of
certain purely syntactic aspects of adjective order—specifically, that adjectives can precede
nouns, and that adjectives can precede other adjectives. Furthermore, the fact that these patients
also obtained high scores on Task 3 constitutes evidence that their poor performance on Task
1 was not due to disrupted understanding of the syntactically relevant categorical semantic
features of adjectives—specifically, features like “dimension” (for thick, thin, etc.) and
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“color” (for blue, green, etc.) which interact with the abstract semantic principles that determine
how different classes of adjectives are typically sequenced. We should note that the fact that
Tasks 2 and 3 yielded performances at ceiling in the normal participants makes the dissociation
between Task 1 and Tasks 2 and 3 somewhat less unequivocal. However, we would hasten to
add that, of the six relevant patients, three also performed at ceiling in Task 2 and two at ceiling
in Task 3 (see Table 3). Moreover, none missed more than one item in Task 2 and two items
in Taks 3. Thus, it is possible that the reason they failed Task 1 is because their lesions
selectively affected their knowledge and/or processing of the abstract semantic principles that
underlie adjective order.
3. NEUROANATOMICAL STUDY
3.1. Participants
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In a follow-up study we investigated the types of lesion patterns that are associated with
impaired discrimination between correct and incorrect adjective sequences. We focused on 12
patients: the six patients described above (i.e., those who only failed Task 1), and the six patients
from Kemmerer’s (2000) original study (i.e., those mentioned in the Introduction). Our
decision to include the latter six patients in the neuroanatomical analysis was based on the
following considerations. As we show in the Results section, the former six patients turned out
to have greater variability than we expected, not only in terms of the sites and etiologies of
their lesions, but also in terms of their handedness. Thus, by adding the latter six patients to
our analysis, we were able to form a larger group that was more balanced with regard to both
neuroanatomy and handedness. This decision came at a cost because, from a
neuropsychological perspective, although we have reason to suspect that the former six
patients’ difficulties with adjective order stem from defective sensitivity to the pertinent
semantic constraints, we do not know if the latter six patients’ dificulties with adjective order
were also due to defective sensitivity to the pertinent semantic constraints, or if instead they
were due to defective sensitivity to the syntactically relevant categorical semantic features of
adjectives. Despite this uncertainty, however, we are confident that all 12 patients have
impairments affecting at least some semantic aspects of adjective order, whether they be at the
construction level or the word level. It is therefore this general type deficit—one that is still
very narrowly defined in functional terms—that we sought to relate to the patients’ lesion sites.
3.2. Methods
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The neuroanatomical analysis was based on magnetic resonance imaging data obtained in a
1.5 Tesla General Electric Sigma scanner with a 3D SPGR sequence yielding 1.5 mm
contiguous T1 weighted coronal cuts. Lesion mapping on a reference brain was performed
according to MAP-3 methods, using the Brainvox programs (Frank et al., 1997). This method
entails a transfer of each patient’s lesion to a common space in a template brain. Each patient’s
lesion was coded according to the neuroanatomical regions specified by Damasio and Damasio
(1989), thereby allowing us to search for common lesion sites.
3.3. Results and Discussion
Of the six patients who we concentrated on in the behavioral study in section 2 (in the current
study), one (2563) was a case of anoxia with bilateral lesions circumscribed to the hippocampal
region, and two had unilateral lesions in the right hemisphere (2268 had an anterior temporal
lobectomy, and 2947 had dorsolateral prefrontal damage due to a stroke); moreover, two of
these three patients were left-handed. The other three patients in this set of six had unilateral
left hemisphere lesions due to different etiologies (stroke, hemorrhage, and anterior temporal
lobectomy), and one of them was left-handed. Of the six patients who were the focus of
Kemmerer’s (2000) original study, all had unilateral left hemisphere lesions caused by strokes;
five were right-handed and one was left-handed.
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Comparison of the lesion sites of the nine patients with unilateral left hemisphere lesions
yielded the following results. The most common area of damage (four cases) was in the left
inferior parietal lobule, including the inferior part of the supramarginal gyrus (BA1 40) and
extending into the angular gyrus (BA 39). Another frequently affected area (three cases) was
the posterior inferior frontal gyrus (BA 44/45 and the ventral part of BA 6) and/or the white
matter underneath this region.
An important question concerns the specificity of these brain-behavior correlations. Across the
two studies, were there any patients who performed normally at distinguishing between correct
and incorrect adjective sequences but who had lesions that overlapped one or both of the two
zones indicated above—i.e., the left inferior parietal lobule (especially the supramarginal
gyrus) and the left posterior inferior frontal region? We investigated the lesion sites of the ten
patients in Kemmerer’s (2000) original study who had normal adjective order judgment, and
found three “false negatives,” two with damage encompassing both zones and one with damage
encompassing just the frontal zone. We also investigated the lesion sites of the 27 patients in
the current study who had normal adjective order judgment, and did not find any “false
negatives.”
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Overall, the neuroanatomical data indicate that impaired sensitivity to semantic aspects of
adjective order is most often associated with lesions involving the left inferior frontoparietal
territory. However, damage to this territory does not always give rise to the deficit, and damage
to other regions can also engender it.
4. GENERAL DISCUSSION
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In previous work Kemmerer (2000) reported six patients who were unable to distinguish correct
from incorrect sequences of prenominal descriptive adjectives. It was not clear, however,
whether the patients’ disorders affected specifically their understanding of the abstract
semantic constraints that govern adjective order (see the reference to constraints in the top
portion of Figure 1), or if instead their disorders affected specifically their understanding of
the categorical aspects of adjective meanings that interact with those constraints (see the
reference to these semantic features in the bottom portion of Figure 1). One of the aims of the
present investigation was to overcome this limitation. To that end, we identified seven new
patients who also exhibited defective discrimination between correct and incorrect adjective
sequences. Moreover, for six of these patients we obtained additional data suggesting that their
impairments were highly selective in nature, affecting their appreciation of the semantic
constraints underlying adjective order, but leaving intact their sense of the categorical features
of adjective meanings that feed into those constraints. To take a concrete example, as shown
in Table 4, four of the six patients could no longer judge that dimensional adjectives like
thick and thin should be placed before rather than after color adjectives like blue and green;
however, all of them could still reliably indicate that dimensional adjectives are semantically
more similar to each other than they are to color adjectives, and that color adjectives are
semantically more similar to each other than they are to dimensional adjectives. In other words,
although the patients lost their understanding of how dimensional and color adjectives are
typically sequenced relative to each other, they retained their understanding that certain
adjectives belong to the “dimensional” class whereas others belong to the “color” class. Thus,
the results of this investigation extend those of the previous one by providing evidence that
sensitivity to the semantic constraints on adjective order can be disrupted independently of
sensitivity to the semantic features of adjectives to which those constraints apply.
1BA stands for Brodmann area, and we use the standard notational system.
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What is the precise nature of the semantic constraints on adjective order? Linguists disagree
about exactly how they should be characterized, but several intriguing proposals have been
made (for a partial review see Frawley, 1992, pp. 480–496). At the very outset, it is important
to note that most of the ordering patterns found in English have also been observed in a variety
of other languages that have prenominal adjective order—e.g., German, Hungarian, Polish,
Turkish, Amharic, Hindi, Telugu, Chinese, and Japanese—and the mirror images of these
patterns appear in a variety of languages with postnominal adjective sequences—e.g.,
Chichewa, Basque, Persian, Indonesian, and Qiang (Dixon, 1982; Hetzron, 1978; LaPolla &
Huang, 2004; Martin, 1969b). Because many of these languages are geographically,
historically, and typologically quite distant from each other, no mutual influences need be
suspected, thus raising the possibility that the most commonly attested ordering patterns, such
as the “value > size > color” hierarchy, reflect universal cognitive predispositions for mapping
descriptive semantic properties onto linear syntactic positions.2
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Two closely related scalar principles appear to be at work. The first principle involves degree
of objectivity: adjectives that denote objective, verifiable properties, like color, tend to occur
closer to the modified noun than adjectives that denote subjective, opinion-based properties,
like value (Hetrzon, 1978; Martin, 1969a; Quirk et al., 1985). The second principle, which is
more subtle, involves degree of absoluteness:3 adjectives that denote the same absolute
property regardless of the referential nominal context tend to occur closer to the modified noun
than adjectives whose interpretation is more relativistic insofar as it shifts with the referential
nominal context (Ferris, 1993; Frawley, 1992; Martin, 1969a; Siegel, 1980). This principle is
nicely illustrated by the difference between the expressions big black ant and big black
skyscraper. The meaning of black remains fairly constant regardless of the meaning of the
noun it modifies—e.g., in an absolute sense, a black ant and a black skyscraper have very
similar colors and hence are black in essentially the same sort of way. The meaning of big,
however, changes considerably depending on the meaning of the noun it modifies—e.g., in an
absolute sense, a big ant and a big skyscraper have very different sizes and hence are big in
fundamentally contrasting ways. So, the basic idea is that when both black and big are used to
modify a noun, black tends to occur closer to the noun than big, because the meaning of
black is more absolute than the meaning of big. Both of the scalar principles just outlined reflect
a more general type of semiotic coding strategy that is widespread in grammar and that is
sometimes called “diagrammatic iconicity” (Haiman, 1985a, 1985b). This strategy involves
mapping distance relations in semantic space (in this particular case, along the scales of
objectivity and absoluteness) onto distance relations in syntactic space (in this particular case,
along the scale of closeness to the modified noun).
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Taken together, these two principles provide substantial insight into the nature of the semantic
constraints on adjective order; however, their explanatory power is limited in several ways.
First, cross-linguistically, although the principles account well for the major typological
tendencies, there are non-trivial exceptions. For example, in Selepet value adjectives occur
closer to the modified noun than size adjectives (Dixon, 1982, p. 26), leading Frawley (1992,
p. 485) to ask, in quasi-Whorfian style, “Does this mean that value is more objective in this
language/culture?” Second, within individual languages, fine-grained ordering patterns exist
that cannot easily be explained in terms of the two principles. For instance, in English size
adjectives typically precede dimensional adjectives, but one would be hard pressed to show,
in a non-circular manner, that these two classes of adjectives vary in the expected ways along
2A caveat is that so far all of the cross-linguistic research on adjective order has been conducted with small databases. No studies have
been conducted that match the complexity of, say, Matthew Dryer’s massive investigations of other aspects of word order, investigations
that operate with well-balanced global samples of, on average, about 1,000 languages (see Dryer’s 17 chapters on word order in
Haspelmath et al., 2005).
3Frawley (1992) points out how degree of absoluteness is similar to both degree of categorematicity and degree of intensionality.
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the scales of objectivity and absoluteness. Furthermore, to our knowledge the possible role of
statistical learning in the development of adjective order patterns has yet to be explored.
Nevertheless, even though the two principles discussed above have some shortcomings, they
do seem to be on the right track. And for this reason, they shed light on the specific linguistic
capacity that appears to be disrupted in the six patients who only failed Task 1.
Another limitation of Kemmerer’s (2000) original investigation is that a detailed lesion analysis
was not conducted. We therefore combined the six patients from that investigation with the six
patients from the current one, yielding a group of 12 patients who all manifested significant
difficulties with semantic aspects of adjective order. (To reiterate: For the six new patients, we
know that those difficulties involved just the construction level, since the patients succeeded
in Task 3; however, for the six old patients, they might involve either the construction level or
the word level, since no equivalent to Task 3 was administered.) Overall, we found a fair amount
of variability in the patients’ lesion sites, especially among the six new patients. We interpret
this outcome as suggesting that the type of task that we employed to probe the patients’
understanding of adjective order—namely, explicit discrimination between correct and
incorrect sequences of prenominal adjectives—may depend on a complex network of
distributed brain structures, some which subserve the necessary forms of semantic knowledge,
and some of which mediate various processing operations involved in formulating
metalinguistic grammaticality judgments for these particular kinds of expressions.
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Nonetheless, despite the fact that the patients exhibited a considerable amount of
neuroanatomical diversity, it is noteworthy that the two most frequently damaged regions
(showing up in 3–4 of the 9 left-hemisphere patients) were the left posterior inferior frontal
gyrus and the left inferior parietal lobule. The left posterior inferior frontal gyrus encompasses
Broca’s area, which is, of course, well established as being a major computational hub for
language (for recent studies see, e.g., Grodzinsky & Amunts, 2006; Lindenberg et al., 2007;
Schubotz & Fiebach, 2006). Given that our research on adjective order is rooted in
contemporary construction-based approaches to language (as exemplified by, e.g., Fried &
Boas, 2005; Goldberg, 2003, 2006; Jackendoff, 2002, 2007; Langacker, 2008; Östman & Fried,
2005; Van Valin, 2005), we would like to point out that there is increasing evidence for the
hypothesis that Broca’s area plays a crucial role in the integration and linearization of the
different kinds of linguistic information—most importantly, syntactic and semantic
information—that comprise grammatical constructions (e.g., Bornkessel & Schlesewsky,
2006; Dominey & Hoen, 2006; Dominey et al., 2006; Hagoort, 2005; Hoen et al., 2006;
Kemmerer, 2006a). Our finding that Broca’s area is implicated in adjective order converges
with this line of inquiry, because adjective order hinges on intricate interactions between colinear syntactic and semantic representations. As for the left inferior parietal lobule, which we
also found to be damaged in several patients, one possible interpretation is that it may be related
to the fact that, as noted earlier, the semantic constraints on adjective order involve
diagrammatic iconicity. Recent research has linked the left inferior parietal lobule with the
processing of spatial image schemas, especially those associated with language (for a review
see Kemmerer, 2006b), and for this reason it is not inconceivable that the same region might
also facilitate the processing of the “spatialized” form-function mappings that lie at the heart
of the semantic constraints on adjective order. This idea is a conjecture that requires more
detailed investigation in the future.4
4Our conjecture revives, in part, Deane’s (1992) “Parietal Hypothesis,” which maintains that much of syntax has spatial foundations
implemented by the left parietal lobe (for an early critique see Kemmerer, 1998).
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Acknowledgments
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This research was supported by grants from the NIDCD (RO3 DC006137-01), NINDS (P01 NS19632), and NIDA
(R01 DA022549). We thank Ken Manzel and Amanda Trad for assistance with data collection, and Kathy Jones and
Ruth Henson for assistance with scheduling the participants.
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APPENDIX A
This appendix lists the 70 sentence pairs that were used in Task 1, organized according to
subtype of adjective order. Also shown are the average naturalness ratings, based on a scale
from 1 (very bad) to 5 (very good), provided by 72 healthy participants (see Methods). Note:
Only 9 of the 70 sentence pairs contained normal and reversed adjective sequences that were
also used in the study by Kemmerer (2000; compare this appendix with the one in that paper).
Correct Order
Rating
Value + Size
The boy has a nice small cup
Incorrect Order
Rating
Size + Value
4.2
The boy has a small nice cup
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Correct Order
Rating
Incorrect Order
Rating
Mrs. Jones lived in a beautiful gigantic mansion
4.2
Mrs. Jones lived in a gigantic beautiful
mansion
2.4
Melissa visited a splendid large museum
3.7
Melissa visited a large splendid museum
2.3
Mike sold a nice big table
4.4
Mike sold a big nice table
1.6
Jill saw a gorgeous giant sunflower
3.8
Jill saw a giant gorgeous sunflower
2.5
Mr. Smith owns a nasty little dog
4.1
Mr. Smith owns a little nasty dog
Subtotal
4.1 (0.3)
Value + Dimension
The house has a good high ceiling
2.4
2.1 (0.4)
Dimension + Value
3.9
The house has a high good ceiling
1.3
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Emma bought a nice tall candle
4.4
Emma bought a tall nice candle
1.6
The truck drove across a terrible narrow bridge
3.9
The truck drove across a narrow terrible
bridge
1.7
Chris discovered a lovely shallow pond
4.4
Chris discovered a shallow lovely pond
1.7
Lisa has a nice long ribbon
4.7
Lisa has a long nice ribbon
1.8
The boy slept on a nice thick mattress
4.8
The boy slept on a thick nice mattress
Subtotal
4.4 (0.4)
Value + Physical Property
1.6
1.6 (0.2)
Physical Property + Value
The ship sailed in the nice calm morning
4.2
The ship sailed in the calm nice morning
1.8
Michelle cooked a nice hot dinner
4.5
Michelle cooked a hot nice dinner
1.6
The boy built a good sturdy treehouse
4.2
The boy built a sturdy good treehouse
1.7
Mr. Wilson has a good firm handshake
4.9
Mr. Wilson has a firm good handshake
1.9
The man bought a good stiff board
4.0
The man bought a stiff good board
1.7
The table has a nice smooth surface
4.9
The table has a smooth nice surface
1.8
Subtotal
4.5 (0.4)
Value + Color
1.8 (0.1)
Color + Value
Mike has a cute black puppy
4.7
Mike has a black cute puppy
1.5
Jennifer saw a gorgeous purple butterfly
4.7
Jennifer saw a purple gorgeous butterfly
1.3
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The boy had a cute gray rabbit
4.7
The boy had a gray cute rabbit
1.3
Jill has a pretty blue fish
4.8
Jill has a blue pretty fish
1.6
Mr. Smith wore an ugly yellow jacket
4.9
Mr. Smith wore a yellow ugly jacket
1.7
Mrs. Jones has a lovely white blouse
4.9
Mrs. Jones has a white lovely blouse
1.5
Subtotal
4.8 (0.1)
Size + Dimension
1.5 (0.2)
Dimension + Size
Mr. Wilson used a big long rope
4.3
Mr. Wilson used a long big rope
1.8
Sarah read a small thin book
3.9
Sarah read a thin small book
1.9
The man works in a big tall building
4.5
The man works in a tall big building
1.7
Jeff drove across a tiny narrow bridge
4.6
Jeff drove across a narrow tiny bridge
1.8
Maria bought a large thick blanket
4.3
Maria bought a thick large blanket
2.4
The bird stood in a tiny shallow puddle
4.3
The bird stood in a shallow tiny puddle
Subtotal
4.3 (0.2
Size + Physical Property
1.9
1.9 (0.2)
Physical Property + Size
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Correct Order
Rating
Incorrect Order
Rating
Miss Lane moved a large hollow log
4.6
Miss Lane moved a hollow large log
1.4
Jennifer cleaned a small square rug
4.3
Jennifer cleaned a square small rug
1.4
Bob ate a big ripe apple
4.6
Bob ate a ripe big apple
1.6
The astronomer observed a massive spiral galaxy
4.5
The astronomer observed a spiral massive
galaxy
1.4
Mr. Smith is a big strong man
4.8
Mr. Smith is a strong big man
1.7
The ship hit a big hard rock
4.5
The ship hit a hard big rock
1.6
Subtotal
4.6 (0.2)
Size + Color
1.5 (0.1)
Color + Size
Mr. Wilson caught a small white moth
4.7
Mr. Wilson caught a white small moth
1.4
Lisa rode a huge gray elephant
4.6
Lisa rode a gray huge elephant
1.3
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Melissa drove a big orange truck
4.9
Melissa drove an orange big truck
1.5
John has a large brown desk
4.9
John has a brown large desk
1.4
Mrs. Lee made a huge green sign
4.9
Mrs. Lee made a green huge sign
1.6
Jeff fixed a small black clock
4.8
Jeff fixed a black small clock
1.5
Subtotal
4.8 (0.1)
Dimension + Physical Property
1.5 (0.1)
Physical Property + Dimension
Mike peered into a deep wet hole
4.1
Mike peered into a wet deep hole
1.8
The doctor took a long slow train
4.0
The doctor took a slow long train
1.7
The ranger took a long rough path
4.0
The ranger took a rough long path
1.6
Jill sat on a long heavy couch
4.1
Jill sat on a heavy long couch
1.9
Jennifer filled a tall empty glass
4.2
Jennifer filled an empty tall glass
1.8
Mrs. Lee helped a short fat boy
4.6
Mrs. Lee helped a fat short boy
Subtotal
4.2 (0.2)
Dimension + Color
Mrs. Jones entered a tall black skyscraper
1.8
1.8 (0.1)
Color + Dimension
4.5
Mrs. Jones entered a black tall skyscraper
1.6
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The man wore a thin green shirt
4.7
The man wore a green thin shirt
1.6
Melissa wore a long blue dress
4.7
Melissa wore a blue long dress
1.3
The house has a short white fence
4.5
The house has a white short fence
1.6
John bought a thick blue towel
4.6
John bought a blue thick towel
1.6
Sarah cut a thin blue thread
4.8
Sarah cut a blue thin thread
Subtotal
4.6 (0.1)
Physical Property + Color
1.8
1.6 (0.2)
Color + Physical Property
Michelle drove a fast red car
4.7
Michelle drove a red fast car
1.6
Jill bought a soft brown sweater
4.7
Jill bought a brown soft sweater
1.4
Miss Lane folded a clean white napkin
4.9
Miss Lane folded a white clean napkin
1.8
Jeff wore a warm black coat
4.9
Jeff wore a black warm coat
1.7
The artist painted a clear blue sky
4.9
The artist painted a blue clear sky
1.5
The girl used a sharp silver needle
4.8
The girl used a silver sharp needle
1.6
Subtotal
4.8 (0.1)
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Correct Order
Rating
Grand Total
4.0 (1.4)
Color + Material
Incorrect Order
Rating
1.7 (0.3)
Material + Color
The horse jumped over a gray stone wall
-
The horse jumped over a stone gray wall
-
The baby found a yellow plastic toy
-
The baby found a plastic yellow toy
-
Mrs. Lee owns a red cotton shawl
-
Mrs. Lee owns a cotton red shawl
-
Michelle has a purple nylon umbrella
-
Michelle has a nylon purple umbrella
-
Sarah bought a green wool sweater
-
Sarah bought a wool green sweater
-
Jennifer carried a brown paper bag
-
Jennifer carried a paper brown bag
-
Brian bought a black metal file cabinet
-
Brian bought a metal black file cabinet
-
Jeff found a purple canvas shoe
-
Jeff found a canvas purple shoe
-
Mrs. Jones bought a white silk scarf
-
Mrs. Jones bought a silk white scarf
-
Jennifer wore a black leather belt
-
Jennifer wore a leather black belt
-
APPENDIX B
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This appendix lists the 15 NP pairs that were used in Task 2, organized according to subtype
of NP.
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Correct Order
Incorrect Order
Adjective + Noun
Noun + Adjective
big field
field big
tall man
man tall
heavy box
box heavy
different cat
cat different
green carpet
carpet green
Adjective + Adjective + Noun
Noun + Adjective + Adjective
warm sweet air
air sweet warm
soft calm eyes
eyes calm soft
harsh thin light
light thin harsh
smart kind woman
woman kind smart
fat round bottle
bottle round fat
Determiner + Adjective + Adjective + Noun
Noun + Adjective + Adjective + Determiner
a cool light rain
rain light cool a
a hilly bumpy road
road bumpy hilly a
an interesting likeable person
person likeable interesting a
a natural peaceful expression
expression peaceful natural a
a relaxed confident actor
actor confident relaxed a
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APPENDIX C
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This appendix lists the 25 triads of adjectives that were used in Task 3, organized according
to the categorical semantic features that served as the bases for similarity judgments. For each
item, the pivot adjective is in the left column in upper case font, the target (correct) adjective
is in the middle column, and the distractor (incorrect) adjective is in the right column.
Pivot
Target
Distractor
GOOD
bad
tiny
SPLENDID
superb
tall
EXCELLENT
wonderful
hot
TERRIBLE
horrible
black
AWFUL
marvelous
gigantic
BIG
little
good
LARGE
small
deep
HUGE
gigantic
heavy
TINY
puny
pink
ENORMOUS
immense
thick
thin
splendid
Value
Size
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Dimension
THICK
TALL
short
puny
DEEP
shallow
soft
WIDE
narrow
blue
SHORT
long
terrible
Physical Property
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ROUGH
smooth
excellent
SOFT
hard
immense
HOT
cold
wide
LIGHT
heavy
awful
COOL
warm
yellow
Color
BLACK
white
superb
RED
green
enormous
BLUE
yellow
narrow
ORANGE
purple
rough
BROWN
pink
short
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Figure 1.
Interactions between the basic adjective order construction and the meanings of individual
adjectives. Top: The adjective order construction has both syntactic and semantic levels:
syntactically, it specifies that multiple adjectives can precede a noun; and semantically, it
specifies that those adjectives encode descriptive properties of the entity designated by the
noun. Most importantly, the construction stipulates that the sequential mapping of descriptive
properties onto adjective positions is semantically constrained. Bottom: Adjective meanings
have two kinds of semantic features: first, categorical (i.e., class-level) features that are relevant
to syntax insofar as they interact directly with the semantic constraints stipulated by the
adjective order construction; and second, idiosyncratic (i.e., word-specific) features that are
irrelevant to syntax and instead serve to distinguish between the adjectives comprising each
class.
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Table 1
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Ordering patterns for descriptive adjectives. These positional preferences reflect the following linear hierarchy
of semantic classes: value > size > dimension > various physical properties > color. The number after each
example is the average naturalness rating that the item received on a scale from 1 (very bad) to 5 (very good)
from 72 participants (see also Appendix A).
Subtypes of Adjective Order
Correct Example
Incorrect Example
Value + Size
a nice small cup (4.2)
a small nice cup (1.5)
Value + Dimension
a good high ceiling (3.9)
a high good ceiling (1.3)
Value + Physical Property
a nice hot dinner (4.5)
a hot nice dinner (1.6)
Value + Color
a gorgeous purple butterfly (4.7)
a purple gorgeous butterfly (1.3)
Size + Dimension
a big tall building (4.5)
a tall big building (1.7)
Size + Physical Property
a small square rug (4.3)
a square small rug (1.4)
Size + Color
a huge gray elephant (4.6)
a gray huge elephant (1.3)
Dimension + Physical Property
a long rough path (4.0)
a rough long path (1.6)
Dimension + Color
a thick blue towel (4.6)
a blue thick towel (1.6)
Physical Property + Color
a soft brown sweater (4.7)
a brown soft sweater (1.4)
NIH-PA Author Manuscript
NIH-PA Author Manuscript
J Neurolinguistics. Author manuscript; available in PMC 2010 April 26.
Kemmerer et al.
Page 19
Table 2
NIH-PA Author Manuscript
Results for all participants on all tasks. Cells indicate mean percent correct, with standard deviations in
parentheses.
Task
Brain-Damaged Patients (N=34)
Normal Participants (N=19)
1: Syntax (semantically constrained)
91.7 (10.7)
94.7 (3.6)
2: Syntax (semantically unconstrained)
98.5 (3.3)
100
3: Semantics (categorical similarities)
97.5 (5.3)
99.8 (0.9)
NIH-PA Author Manuscript
NIH-PA Author Manuscript
J Neurolinguistics. Author manuscript; available in PMC 2010 April 26.
NIH-PA Author Manuscript
NIH-PA Author Manuscript
NIH-PA Author Manuscript
Table 3
Task
3310
3300
2268
2563
2947
3273
3297
1: Syntax (semantically constrained)
63
66
70
80
80
87
67
2: Syntax (semantically unconstrained)
100
93
100
93
100
93
87
3: Semantics (categorical similarities)
100
92
92
92
100
92
72
Kemmerer et al.
Results for individual brain-damaged patients impaired on one or more tasks involving adjectives. Cells indicate percent correct. Shaded cells indicate
defective scores.
J Neurolinguistics. Author manuscript; available in PMC 2010 April 26.
Page 20
NIH-PA Author Manuscript
NIH-PA Author Manuscript
NIH-PA Author Manuscript
Table 4
J Neurolinguistics. Author manuscript; available in PMC 2010 April 26.
Subtype of Adjective Order
Normal Ss
3310
3300
2268
2563
2947
3273
3297
Value + Size
83.0 (7.6)
33
83
33
83
50
83
50
Value + Dimension
95.8 (3.8)
50
83
83
100
67
100
50
Value + P.P.
100
83
67
83
100
83
100
33
Value + Color
100
67
83
83
100
100
100
100
Size + Dimension
88.0 (14.4)
40
60
60
80
100
80
80
Size + P.P.
92.5 (13.6)
75
63
75
50
75
100
75
Size + Color
98.3 (4.1)
83
50
83
100
100
100
50
Dimension + P.P.
96.0 (4.2)
80
60
80
80
80
60
100
Dimension + Color
98.3 (2.6)
33
33
33
50
100
83
67
P.P. + Color
97.5 (2.7)
67
50
83
33
100
67
83
Color + Material
91.5 (9.4)
70
80
70
100
50
80
60
Total
94.7 (3.6)
63
66
70
80
80
87
67
Kemmerer et al.
Results for brain-damaged patients, relative to normal comparison participants, on the 11 subtypes of adjective order in Task 1. Cells indicate percent correct,
with standard deviations in parentheses for the normal comparison participants, and with shading indicating scores of less than 75% correct for the braindamaged patients.
Abbreviation: P.P. = Physical Property.
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