期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 41, 页码 17751-17756出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1006223107
关键词
decision making; motor control; manual reaching; action
资金
- Natural Sciences and Engineering Research Council of Canada
- Canadian Institutes of Health Research
- National Institutes of Health [P01 NS040813]
- National Science Foundation [IIS 0703787]
- Belgian American Educational Foundation
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.
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