A B S T R A C T Recent studies have suggested that individuals can form multiple motor memories w... more A B S T R A C T Recent studies have suggested that individuals can form multiple motor memories when simultaneously adapting to multiple, but oppositely-oriented perturbations. These findings predict that individuals detect the change in learning context, allowing the selective initialization and update of motor memories. However, previous elec-trophysiological studies of sensorimotor adaptation have not identified a neural mechanism supporting the detection of a context switch and adaptation to separate contexts. Here, we tested the hypothesis that such a mechanism is identifiable through neural oscillations measured through EEG. Human participants learned to manipulate an object in two opposite contexts (mass distribution). This task was designed based on previous work showing that people can adapt to both contexts. We found that sensorimotor α and β, and medial frontal θ frequency bands all exhibited different response patterns with respect to the error in each context. To determine whether any frequency's responses to error were distinctly related to a switch in context, we predicted single-trial EEG data from a computational learning model that can adapt to multiple contexts simultaneously based on a switching mechanism. This analysis revealed that only medial frontal θ was predicted by a component of the model state that adapts to errors based on a context switch. In contrast, α and β were predicted by a model state that was updated from performance errors independent of the context. These findings provide novel evidence showing that sensorimotor and medial frontal oscillations are predicted by different adaptation processes, and that changes in medial frontal activity may indicate the formation of motor memories by responding to changes in learning context.
Journal of experimental psychology. Human perception and performance, Jan 5, 2015
Researchers generally agree that perceived heaviness is based on the actions associated with unsu... more Researchers generally agree that perceived heaviness is based on the actions associated with unsupported holding. Psychophysical research has supported this idea, as has psychophysiological research connecting muscle activity to the perceptions of heaviness and effort. However, the role of muscle activity in the context of the resulting motions has not been investigated. In the present study, perceptions of heaviness were recorded along with the electromyogram (EMG) of the lifting muscle and peak acceleration of the lift. Consistent with predictions derived from Newton's Second Law of motion (Force = Mass×Acceleration), normal and illusory perceptions of heaviness were a function of the ratio of muscle activity to lifting acceleration. These results identify a psychophysiological mechanism for heaviness perception based on the forces and motions associated with unsupported holding. (PsycINFO Database Record
Journal of Experimental Psychology: Human Perception and Performance, 2015
Researchers generally agree that perceived heaviness is based on the actions associated with unsu... more Researchers generally agree that perceived heaviness is based on the actions associated with unsupported holding. Psychophysical research has supported this idea, as has psychophysiological research connecting muscle activity to the perceptions of heaviness and effort. However, the role of muscle activity in the context of the resulting motions has not been investigated. In the present study, perceptions of heaviness were recorded along with the electromyogram (EMG) of the lifting muscle and peak acceleration of the lift. Consistent with predictions derived from Newton's Second Law of motion (Force = Mass×Acceleration), normal and illusory perceptions of heaviness were a function of the ratio of muscle activity to lifting acceleration. These results identify a psychophysiological mechanism for heaviness perception based on the forces and motions associated with unsupported holding. (PsycINFO Database Record
Rhythmic coordination with stimuli and other people’s movements containing variable or unpredicta... more Rhythmic coordination with stimuli and other people’s movements containing variable or unpredictable fluctuations might involve distinct processes: detecting the fluctuation structure and tuning to or matching the structure’s temporal complexity. This framework predicts that global tuning and local parameter adjustments (e.g., position, velocity or phase) can operate independently during coordination (Marmelat & Delignières, 2012). Alternatively, we propose that complexity matching is a result of local phase adjustments during coordination (Delignières & Marmelat, 2014; Torre, Varlet, & Marmelat, 2013). The current study examined this relationship in a rhythmic interpersonal coordination task. Dyads coordinated swinging pendulums that differed in their uncoupled frequencies (detuning). We predicted that frequency detuning would require increased local corrections to maintain the intended phase pattern (in phase). This was expected to yield a relative phase shift accompanied by a change in period complexity and matching. Experimental data and numerical modeling of the pendulum dynamics confirmed our predictions. Increased relative phase shifts occurred simultaneously with increased dissociation between individuals’ movement period complexity. This provided evidence that global complexity matching is intricately linked to local movement adjustments and is not a distinct coordination mechanism. These findings are considered with respect to dynamical and computational approaches to interpersonal coordination.
Paula M. Niedenthal Centre National de la Recherche Scientifique (CNRS) and Clermont Université, ... more Paula M. Niedenthal Centre National de la Recherche Scientifique (CNRS) and Clermont Université, 63037 Clermont-Ferrand, France niedenthal@wisc.eduhttp://wwwpsy.univ-bpclermont .fr/∼niedenthal/ ... Martial Mermillod Centre National de la Recherche Scientifique ...
A B S T R A C T Recent studies have suggested that individuals can form multiple motor memories w... more A B S T R A C T Recent studies have suggested that individuals can form multiple motor memories when simultaneously adapting to multiple, but oppositely-oriented perturbations. These findings predict that individuals detect the change in learning context, allowing the selective initialization and update of motor memories. However, previous elec-trophysiological studies of sensorimotor adaptation have not identified a neural mechanism supporting the detection of a context switch and adaptation to separate contexts. Here, we tested the hypothesis that such a mechanism is identifiable through neural oscillations measured through EEG. Human participants learned to manipulate an object in two opposite contexts (mass distribution). This task was designed based on previous work showing that people can adapt to both contexts. We found that sensorimotor α and β, and medial frontal θ frequency bands all exhibited different response patterns with respect to the error in each context. To determine whether any frequency's responses to error were distinctly related to a switch in context, we predicted single-trial EEG data from a computational learning model that can adapt to multiple contexts simultaneously based on a switching mechanism. This analysis revealed that only medial frontal θ was predicted by a component of the model state that adapts to errors based on a context switch. In contrast, α and β were predicted by a model state that was updated from performance errors independent of the context. These findings provide novel evidence showing that sensorimotor and medial frontal oscillations are predicted by different adaptation processes, and that changes in medial frontal activity may indicate the formation of motor memories by responding to changes in learning context.
Journal of experimental psychology. Human perception and performance, Jan 5, 2015
Researchers generally agree that perceived heaviness is based on the actions associated with unsu... more Researchers generally agree that perceived heaviness is based on the actions associated with unsupported holding. Psychophysical research has supported this idea, as has psychophysiological research connecting muscle activity to the perceptions of heaviness and effort. However, the role of muscle activity in the context of the resulting motions has not been investigated. In the present study, perceptions of heaviness were recorded along with the electromyogram (EMG) of the lifting muscle and peak acceleration of the lift. Consistent with predictions derived from Newton's Second Law of motion (Force = Mass×Acceleration), normal and illusory perceptions of heaviness were a function of the ratio of muscle activity to lifting acceleration. These results identify a psychophysiological mechanism for heaviness perception based on the forces and motions associated with unsupported holding. (PsycINFO Database Record
Journal of Experimental Psychology: Human Perception and Performance, 2015
Researchers generally agree that perceived heaviness is based on the actions associated with unsu... more Researchers generally agree that perceived heaviness is based on the actions associated with unsupported holding. Psychophysical research has supported this idea, as has psychophysiological research connecting muscle activity to the perceptions of heaviness and effort. However, the role of muscle activity in the context of the resulting motions has not been investigated. In the present study, perceptions of heaviness were recorded along with the electromyogram (EMG) of the lifting muscle and peak acceleration of the lift. Consistent with predictions derived from Newton's Second Law of motion (Force = Mass×Acceleration), normal and illusory perceptions of heaviness were a function of the ratio of muscle activity to lifting acceleration. These results identify a psychophysiological mechanism for heaviness perception based on the forces and motions associated with unsupported holding. (PsycINFO Database Record
Rhythmic coordination with stimuli and other people’s movements containing variable or unpredicta... more Rhythmic coordination with stimuli and other people’s movements containing variable or unpredictable fluctuations might involve distinct processes: detecting the fluctuation structure and tuning to or matching the structure’s temporal complexity. This framework predicts that global tuning and local parameter adjustments (e.g., position, velocity or phase) can operate independently during coordination (Marmelat & Delignières, 2012). Alternatively, we propose that complexity matching is a result of local phase adjustments during coordination (Delignières & Marmelat, 2014; Torre, Varlet, & Marmelat, 2013). The current study examined this relationship in a rhythmic interpersonal coordination task. Dyads coordinated swinging pendulums that differed in their uncoupled frequencies (detuning). We predicted that frequency detuning would require increased local corrections to maintain the intended phase pattern (in phase). This was expected to yield a relative phase shift accompanied by a change in period complexity and matching. Experimental data and numerical modeling of the pendulum dynamics confirmed our predictions. Increased relative phase shifts occurred simultaneously with increased dissociation between individuals’ movement period complexity. This provided evidence that global complexity matching is intricately linked to local movement adjustments and is not a distinct coordination mechanism. These findings are considered with respect to dynamical and computational approaches to interpersonal coordination.
Paula M. Niedenthal Centre National de la Recherche Scientifique (CNRS) and Clermont Université, ... more Paula M. Niedenthal Centre National de la Recherche Scientifique (CNRS) and Clermont Université, 63037 Clermont-Ferrand, France niedenthal@wisc.eduhttp://wwwpsy.univ-bpclermont .fr/∼niedenthal/ ... Martial Mermillod Centre National de la Recherche Scientifique ...
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Papers by Justin Fine
fluctuations might involve distinct processes: detecting the fluctuation structure and tuning to or
matching the structure’s temporal complexity. This framework predicts that global tuning and local
parameter adjustments (e.g., position, velocity or phase) can operate independently during coordination
(Marmelat & Delignières, 2012). Alternatively, we propose that complexity matching is a result of local
phase adjustments during coordination (Delignières & Marmelat, 2014; Torre, Varlet, & Marmelat,
2013). The current study examined this relationship in a rhythmic interpersonal coordination task. Dyads
coordinated swinging pendulums that differed in their uncoupled frequencies (detuning). We predicted
that frequency detuning would require increased local corrections to maintain the intended phase pattern
(in phase). This was expected to yield a relative phase shift accompanied by a change in period
complexity and matching. Experimental data and numerical modeling of the pendulum dynamics
confirmed our predictions. Increased relative phase shifts occurred simultaneously with increased
dissociation between individuals’ movement period complexity. This provided evidence that global
complexity matching is intricately linked to local movement adjustments and is not a distinct coordination
mechanism. These findings are considered with respect to dynamical and computational approaches
to interpersonal coordination.
fluctuations might involve distinct processes: detecting the fluctuation structure and tuning to or
matching the structure’s temporal complexity. This framework predicts that global tuning and local
parameter adjustments (e.g., position, velocity or phase) can operate independently during coordination
(Marmelat & Delignières, 2012). Alternatively, we propose that complexity matching is a result of local
phase adjustments during coordination (Delignières & Marmelat, 2014; Torre, Varlet, & Marmelat,
2013). The current study examined this relationship in a rhythmic interpersonal coordination task. Dyads
coordinated swinging pendulums that differed in their uncoupled frequencies (detuning). We predicted
that frequency detuning would require increased local corrections to maintain the intended phase pattern
(in phase). This was expected to yield a relative phase shift accompanied by a change in period
complexity and matching. Experimental data and numerical modeling of the pendulum dynamics
confirmed our predictions. Increased relative phase shifts occurred simultaneously with increased
dissociation between individuals’ movement period complexity. This provided evidence that global
complexity matching is intricately linked to local movement adjustments and is not a distinct coordination
mechanism. These findings are considered with respect to dynamical and computational approaches
to interpersonal coordination.