- Hans-Leo Teulings received his Master's in Experimental Physics and Biophysics in 1975 and a PhD in Experimental Psyc... moreHans-Leo Teulings received his Master's in Experimental Physics and Biophysics in 1975 and a PhD in Experimental Psychology in 1988 from the University of Nijmegen (Radboud University) in The Netherlands. From 1976 to 1993, he conducted research on the motor-control aspects of handwriting in children and adults and on automatic online handwriting recognition at the Nijmegen Institute for Cognition and Information (NICI) together with Profs. Thomassen and Van Galen and in several European Research projects. From 1993 to 1997, he investigated the effects of aging and Parkinson's disease upon handwriting movements at the Motor Control Laboratory, Arizona State University, Tempe, Arizona, USA, with Prof.George Stelmach. In June 1997, he co-founded NeuroScript, an independent research and development institute, funded by the National Institutes of Health (NIH). NeuroScript develops handwriting movement analysis software (e.g., MovAlyzeR). Current projects include a handwriting-based system for psychiatrists to monitor side effects due to schizophrenia medication and handwriting training software for children. In 1982 and 2003 he co-organized International Graphonomics Society (IGS) conferences in Nijmegen, The Netherlands, and Tempe, Arizona, USA, respectively. Hans-Leo Teulings has contributed to many scientific journal articles on handwriting and fine motor control in children, young adults, the elderly, Parkinson's disease patients, and schizophrenia patients.edit
... 1, p<. 05). Apparently, of the three characteristics the spatial characteristic is the most robust one under execution variations that are arbitrary and supposedly irrelevant as to the retrieved motor program. This is again... more
... 1, p<. 05). Apparently, of the three characteristics the spatial characteristic is the most robust one under execution variations that are arbitrary and supposedly irrelevant as to the retrieved motor program. This is again interpreted ...
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The present study explores whether SVD affects bimanual coordination, which is easier to detect than by conventional, MRI-based methods. We tested nine severe SVD patients, eight non-severe (i.e., moderate or mild) SVD patients, eleven... more
The present study explores whether SVD affects bimanual coordination, which is easier to detect than by conventional, MRI-based methods. We tested nine severe SVD patients, eight non-severe (i.e., moderate or mild) SVD patients, eleven healthy age-matched controls, and eight young adults. They were grouped according to Fazekas scale and by age. Participants performed horizontal line drawings with both hands simultaneously on two pen tablets. The movements consisted of rhythmic patterns where participants used both hands to draw horizontal lines in anti-phase on two pen tablets. Each participant underwent a series of neuropsychiatric assessments. Results showed that SVD patients exhibited in each hand smaller horizontal movement amplitudes with variability larger compared to the healthy age-matched controls. Only movement amplitudes appeared to decrease significantly with severity of SVD. Interestingly, we found no relevant differences between the age-matched, elderly controls and the young controls. Therefore, this effect appeared indicative of SVD. The variability of the lines orthogonal to the horizontal lines of the left, non-dominant hand differed only between the severe SVD group and the other groups. Furthermore, partial correlations demonstrated that the mean horizontal movement amplitude of the left hand was positively associated with the clock drawing test score, and the inter-manual asynchrony of the horizontal movements was positively associated with the Trail Making Test-B time. These results indicated that SVD patients show poor bimanual coordination, as reflected by spatial features such as movement amplitudes and variabilities, and abnormal bimanual coordination was associated with executive dysfunction.
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... In some applications, it may be an advantage to analyse handwriting movements in ... Van Emmerik, REA and Newell, KM," The relationship between pen-point and joint kinematics in ... HL," Time, size, and shape in handwriting:... more
... In some applications, it may be an advantage to analyse handwriting movements in ... Van Emmerik, REA and Newell, KM," The relationship between pen-point and joint kinematics in ... HL," Time, size, and shape in handwriting: Exploring spatio-temporal relationships at different ...
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Time, the organizational principle of every motor skill, manifests itself in several ways in the case of handwriting. First, time is systematically involved in the preparation of movements before their onset and during their performance.... more
Time, the organizational principle of every motor skill, manifests itself in several ways in the case of handwriting. First, time is systematically involved in the preparation of movements before their onset and during their performance. The study of reaction times and movement times in handwriting (see Thomassen et al., 1984) has revealed temporal features of the processing stages of writing performance; there are relevant analogies with speech and typewriting (see the review by Sternberg et al., Note 1; and Shaffer, 1985, chapter 15 of the present volume).
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Research Interests: Engineering, Computer Science, Artificial Intelligence, Motor Control, Drug development, and 15 moreMedicine, Movement disorders, Dopamine, Humans, Computer Simulation, Artificial Intelligence in Medicine, Male, Levodopa, Aged, Dose Response Relationship, Basal ganglia, Motor Performance, Experimental Data, Motor Behavior, and Differential expression
... amplitudes in micrographia are probably not attributable to the slowness of movement (bradykinesia) observed in Parkinson's disease. ... proposed by Ackermann and Ziegler (1991) that the characteristic small letter size... more
... amplitudes in micrographia are probably not attributable to the slowness of movement (bradykinesia) observed in Parkinson's disease. ... proposed by Ackermann and Ziegler (1991) that the characteristic small letter size (micrographia) is used by the PD individual to ...
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Research Interests: History and Handwriting
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As a preliminary to the prototype of an online handwriting-recognition system, flexible series of low-level analysis procedures has been developed for the online processing of totally unconstrained cursive script. The present paper... more
As a preliminary to the prototype of an online handwriting-recognition system, flexible series of low-level analysis procedures has been developed for the online processing of totally unconstrained cursive script. The present paper describes these procedures in a non-technical fashion. A distiction is made between (1) continuous procedures yielding estimates of the global properties of the handwriting signal and (2) discrete procedures which deal with appropriately parsed segments of handwriting. The latter procedures are based in part on knowledge of the motor system which is responsible for the human generation of natural cursive script. The low-level analysis is achieved by a set of independent modules in a parallel control structure and interacting in an iterative mode, basing themselves primarily upon lowlevel estimates but also sensitive to confirmation or modification from higher-level information. The series of procedures described in the present contribution results in a sequence of codes representing the strokes of cursively written words.
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Abstract In this study, a comparison is made between a stroke-based, and a character-based recognizer of connected cursive script. Experiments were performed with Kohonen's topology-preserving neural network. In one method, a... more
Abstract In this study, a comparison is made between a stroke-based, and a character-based recognizer of connected cursive script. Experiments were performed with Kohonen's topology-preserving neural network. In one method, a feature vector was based on single velocity-based strokes and a subsequent symbolic character classi cation stage, as reported earlier. In an alternative approach, kinematically segmented characters were time-normalized and represented in a feature vector as a whole. In the latter case, the character ...
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Google, Inc. (search). ...
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Research Interests: Engineering, Psychology, Cognitive Psychology, Multiple sclerosis, Motor Development, and 15 moreMotor Control, Medicine, Human Movement Science, Movement disorders, Handwriting, Dopamine, Developmental Coordination Disorder, Humans, Human Movement, Risk Factors, Movement Disorder, Motor Skills, Psychology and Cognitive Sciences, Automatic segmentation, and Medical and Health Sciences
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This experiment investigates movement coordina-tion in Parkinson's disease (PD) subjects. Seventeen PD patients and 12 elderly control subjects performed several handwriting-like tasks on a digitizing writing tablet resting on top of... more
This experiment investigates movement coordina-tion in Parkinson's disease (PD) subjects. Seventeen PD patients and 12 elderly control subjects performed several handwriting-like tasks on a digitizing writing tablet resting on top of a table in front of the subject. The writing ...
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Research Interests: Psychology, Medicine, Physical Medicine and Rehabilitation, Movement disorders, Handwriting, and 15 moreHumans, Female, Male, Dyskinesia, Differential Diagnosis, Middle Aged, Adult, Reproducibility of Results, Psychotic Disorders, Clinical Psychopharmacology, Biomechanical Phenomena, Neuropsychological Tests, Antipsychotic agents, Psychology and Cognitive Sciences, and Medical and Health Sciences
This paper presents a computational model for the production of handwriting, starting with allograph codes as input and ending with a target pen-tip trajectory as output. In the model, a distinction is made between a symbolic level of... more
This paper presents a computational model for the production of handwriting, starting with allograph codes as input and ending with a target pen-tip trajectory as output. In the model, a distinction is made between a symbolic level of processing and a quantitative level of processing. At the symbolic level, a grammar for the connection of cursive allographs determines abstract codes for connecting strokes. At the quantitative level, a translation of symbols into a sequence of parameterized strokes takes place. A parsimonious stroke ...
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... subjects may enhance limb stiffness which then suppresses high-frequency components of the movement, these components are thought to produce more variable movement trajectory and end-point outcomes (Ghez and Martin, 1982; Hogan, 1984;... more
... subjects may enhance limb stiffness which then suppresses high-frequency components of the movement, these components are thought to produce more variable movement trajectory and end-point outcomes (Ghez and Martin, 1982; Hogan, 1984; Van Galen and Schomaker ...