Transcranial magnetic stimulation of posterior parietal cortex affects decisions of hand choice

Deciding which hand to use for an action is one of the most frequent decisions people make in everyday behavior. Using a speeded reaching task, we provide evidence that hand choice entails a competitive decision process between simultaneously activated action plans for each hand. We then show that s...

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Published in:Proceedings of the National Academy of Sciences - PNAS 2010-10, Vol.107 (41), p.17751-17756
Main Authors: Oliveira, Flavio T. P., Diedrichsen, Jörn, Verstynen, Timothy, Duque, Julie, Ivry, Richard B.
Format: Article
Language:English
Subjects:
Adult
Asymmetry
Behavioral neuroscience
Biological Sciences
Brain
Cerebral hemispheres
Choice Behavior - physiology
Cognition
Cognitive psychology
Cortex (parietal)
Decision making
Experimentation
Female
Functional Laterality - physiology
Hand
Hand - physiology
Hands
Hemispheres
Hemispheric laterality
Humans
Lesions
Motor cortex
Neuroimaging
Parietal Lobe - physiology
Psychomotor Performance - physiology
Right handedness
Social Sciences
Transcranial Magnetic Stimulation
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Diedrichsen, Jörn
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Duque, Julie
Ivry, Richard B.
description Deciding which hand to use for an action is one of the most frequent decisions people make in everyday behavior. Using a speeded reaching task, we provide evidence that hand choice entails a competitive decision process between simultaneously activated action plans for each hand. We then show that single-pulse transcranial magnetic stimulation to the left posterior parietal cortex biases this competitive process, leading to an increase in ipsilateral, left hand reaches. Stimulation of the right posterior parietal cortex did not alter hand choice, suggesting a hemispheric asymmetry in the representations of reach plans. These results are unique in providing causal evidence that the posterior parietal cortex is involved in decisions of hand choice.
doi_str_mv 10.1073/pnas.1006223107
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ispartof Proceedings of the National Academy of Sciences - PNAS, 2010-10, Vol.107 (41), p.17751-17756
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source JSTOR Archival Journals and Primary Sources Collection; PubMed
subjects Adult
Asymmetry
Behavioral neuroscience
Biological Sciences
Brain
Cerebral hemispheres
Choice Behavior - physiology
Cognition
Cognitive psychology
Cortex (parietal)
Decision making
Experimentation
Female
Functional Laterality - physiology
Hand
Hand - physiology
Hands
Hemispheres
Hemispheric laterality
Humans
Lesions
Motor cortex
Neuroimaging
Parietal Lobe - physiology
Psychomotor Performance - physiology
Right handedness
Social Sciences
Transcranial Magnetic Stimulation
title Transcranial magnetic stimulation of posterior parietal cortex affects decisions of hand choice
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