Stimulus and response conflict processing during perceptual decision making |
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Authors: | Carter Wendelken Jochen Ditterich Silvia A Bunge Cameron S Carter |
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Institution: | (1) Center for Health Sciences, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA;(2) Department of Psychology, The University of Melbourne, Parkville, VIC, Australia;(3) Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA; |
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Abstract: | Encoding and dealing with conflicting information is essential for successful decision making in a complex environment. In
the present fMRI study, stimulus conflict and response conflict are contrasted in the context of a perceptual decision-making
dot-motion discrimination task. Stimulus conflict was manipulated by varying dot-motion coherence along task-relevant and
task-irrelevant dimensions. Response conflict was manipulated by varying whether or not competing stimulus dimensions provided
evidence for the same or different responses. The right inferior frontal gyrus was involved specifically in the resolution
of stimulus conflict, whereas the dorsal anterior cingulate cortex was shown to be sensitive to response conflict. Additionally,
two regions that have been linked to perceptual decision making with dot-motion stimuli in monkey physiology studies were
differentially engaged by stimulus conflict and response conflict. The middle temporal area, previously linked to processing
of motion, was strongly affected by the presence of stimulus conflict. On the other hand, the superior parietal lobe, previously
associated with accumulation of evidence for a response, was affected by the presence of response conflict. These results
shed light on the neural mechanisms that support decision making in the presence of conflict, a cognitive operation fundamental
to both basic survival and high-level cognition. |
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Keywords: | |
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