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Differential correlation of frontal and parietal activity with the number of alternatives for cued choice saccades

Cited 12 time in Web of Science Cited 12 time in Scopus
Authors
Lee, Kyoung-Min; Wade, Alex R; Lee, Byeong-Taek
Issue Date
2006
Publisher
Elsevier
Citation
Neuroimage. 33, 307-315
Keywords
*CuesData Interpretation, StatisticalFrontal Lobe/*physiologyImage Processing, Computer-AssistedMagnetic Resonance ImagingParietal Lobe/*physiologyPhotic StimulationReaction Time/physiologySaccades/*physiologyVisual Fields/physiology
Abstract
The time taken to choose a response appropriate for a cue increases with the number of potential response options (Hick's law). We used this temporal constraint of choice behavior in event-related fMRI experiments to identify brain areas carrying out the translation from a cue stimulus to response: Since the process takes longer with more alternatives, the activity of the areas would increase in correlation with the number of alternatives (NA) available at the time of choice decision. During a choice saccade task in which one target is selected among many alternatives based on the color of a cue in the center, the frontal eye fields (FEF) and intraparietal sulcus (IPS) were activated. Within these regions, signals were correlated with NA at the medial part of the FEF and the posterior part of the IPS, but not at the lateral FEF and anterior IPS. This suggests a functional differentiation within each cortical region. Furthermore, given the separate fronto-parietal projections linking sub-regions that are alike in NA-correlation, cognitive steps for choice decision may occur in different networks of the sub-regions: i.e., the stimulus-response translation step in a network of the posterior IPS and medial FEF, and response execution in the anterior IPS/lateral FEF network.
ISSN
1053-8119 (Print)
Language
English
URI
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WNP-4KNKBW8-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=764430f87392f8f20a13b6c90a276efb

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=16919481

http://hdl.handle.net/10371/11083
DOI
https://doi.org/10.1016/j.neuroimage.2006.06.039
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Neurology (신경과학교실)Journal Papers (저널논문_신경과학교실)
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