✦ LIBER ✦

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

✍ Scribed by Sung-Ho Woo; Kyoung-Min Lee

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 341 KB
Volume: 28
Category: Article
ISSN: 1065-9471
DOI: 10.1002/hbm.20317

No coin nor oath required. For personal study only.

✦ Synopsis

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. Hum Brain Mapp 2006. © 2006 Wiley‐Liss, Inc.

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