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How Embodied Is Perceptual Decision Making? Evidence for Separate Processing of Perceptual and Motor Decisions

Filimon, F, Philiastides, MG, Nelson, JD, Kloosterman, NA and Heekeren, HR (2013) How Embodied Is Perceptual Decision Making? Evidence for Separate Processing of Perceptual and Motor Decisions Journal of Neuroscience, 33 (5). pp. 2121-2136.

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The extent to which different cognitive processes are “embodied” is widely debated. Previous studies have implicated sensorimotor regions such as lateral intraparietal (LIP) area in perceptual decision making. This has led to the view that perceptual decisions are embodied in the same sensorimotor networks that guide body movements. We use event-related fMRI and effective connectivity analysis to investigate whether the human sensorimotor system implements perceptual decisions. We show that when eye and hand motor preparation is disentangled from perceptual decisions, sensorimotor areas are not involved in accumulating sensory evidence toward a perceptual decision. Instead, inferior frontal cortex increases its effective connectivity with sensory regions representing the evidence, is modulated by the amount of evidence, and shows greater task-positive BOLD responses during the perceptual decision stage. Once eye movement planning can begin, however, an intraparietal sulcus (IPS) area, putative LIP, participates in motor decisions. Moreover, sensory evidence levels modulate decision and motor preparation stages differently in different IPS regions, suggesting functional heterogeneity of the IPS. This suggests that different systems implement perceptual versus motor decisions, using different neural signatures.

Item Type: Article
Subjects : Psychology
Divisions : Faculty of Health and Medical Sciences > School of Psychology
Authors :
Filimon, F
Philiastides, MG
Nelson, JD
Kloosterman, NA
Heekeren, HR
Date : 30 January 2013
DOI : 10.1523/JNEUROSCI.2334-12.2013
Copyright Disclaimer : © 2013 The Authors. Published by the Society for Neuroscience. This is an open access article under the CC BY-NC-SA license
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 26 Apr 2017 10:58
Last Modified : 31 Oct 2017 19:19

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