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Effect of the number of response alternatives on brain activity in response selection

Cited 5 time in Web of Science Cited 5 time in Scopus
Authors
Woo, S. H.; Lee, K. M.
Issue Date
2006-11-10
Publisher
Wiley-Blackwell
Citation
Hum Brain Mapp. 2007 Oct;28(10):950-8.
Keywords
AdultBrain MappingCerebral Cortex/anatomy & histology/*physiologyCognition/*physiologyCuesDecision Making/*physiologyEvoked Potentials/*physiologyFemaleFunctional Laterality/physiologyGyrus Cinguli/anatomy & histology/physiologyHumansInformation TheoryMagnetic Resonance ImagingMaleNeuropsychological TestsParietal Lobe/anatomy & histology/physiologyPhotic StimulationPrefrontal Cortex/anatomy & histology/physiologyPsychomotor Performance/*physiologyReaction Time/*physiologyTemporal Lobe/anatomy & histology/physiologyTime FactorsVisual Cortex/anatomy & histology/physiology
Abstract
It is well-known in motor control literature that a response time (RT) increases as a logarithmic function of the number of response alternatives (NA) (Hick's law). In this study, we identified neural correlates for this relationship using event-related functional MRI and a choice finger-movement task. Behaviorally, average RTs of all subjects increased as a logarithmic function of the NA in accordance with the law. From a voxel-wise search for brain areas where the activity was correlated with NA and thence the RT, a positive correlation was found at the posterior cingulate and left superior frontal gyri, whereas a negative correlation was observed at areas in bilateral inferior parietal lobules. This differential modulation by the task context, namely, the NA available for a choice response with identical stimulus and response, indicates that these regions are involved in various aspects of response selection, intentional retrieval of motor program, or spatial expectancy.
ISSN
1065-9471 (Print)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17094117

http://hdl.handle.net/10371/22233
DOI
https://doi.org/10.1002/hbm.20317
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College of Medicine/School of Medicine (의과대학/대학원)Neuroscience (뇌신경과학전공)Journal Papers (저널논문_뇌신경과학전공)
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