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The Journal of Neuroscience, February 4, 2004, 24(5):1129-1135; doi:10.1523/JNEUROSCI.4312-03.2004
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Behavioral/Systems/Cognitive
Differential Responses in Human Striatum and Prefrontal Cortex to Changes in Object and Rule Relevance
Roshan Cools, Luke Clark, andTrevor W. Robbins Department of Experimental Psychology, University of Cambridge, Cambridge, CB2 3EB, United Kingdom
Event-related functional magnetic resonance imaging was used to measure blood oxygenation level-dependent responses in 16 young healthy human volunteers during performance of an attentional switching task. The task allowed the separate investigation of lower-order switching between concrete objects and higher-order switching between abstract task rules. Significant signal change in the ventral striatum was demonstrated on trials when subjects switched between objects but not when subjects switched between abstract task rules. In contrast, signal change in the lateral prefrontal cortex (PFC) was observed during all switch trials. The switch-related responses were not contaminated by task difficulty, because the greatest signal change was observed during the relatively easy switch trials, which required both lower-order and higher-order switching at the same time. The present data suggest that mechanisms of inhibitory response control in frontostriatal systems are organized according to distinct levels of abstraction. Specifically, the response selection computation carried by the ventral striatum, which projects to the orbitofrontal cortex and the medial PFC, is restricted to the transformation of concrete stimulus exemplar information into motor responses, whereas the adaptive function of the lateral PFC extends to the transformation of abstract task-rule representations into action.
Key words: object alternation; inhibitory control; task switching; PFC; striatum; adaptation; attention; basal ganglia; cognitive; frontal; imaging
Received Sep 22, 2003; revised December 1, 2003; accepted December 1, 2003.
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