How Embodied Is Perceptual Decision Making? Evidence for Separate Processing of Perceptual and Motor Decisions
How Embodied Is Perceptual Decision Making? Evidence for Separate Processing of Perceptual and Motor Decisions
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DOI：
10.1523/jneurosci.2334-12.2013
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发表时间：
2013-01-30
影响因子：
5.3
通讯作者：
Heekeren, Hauke R.
中科院分区：
文献类型：
--
作者：
Filimon, Flavia;Philiastides, Marios G.;Heekeren, Hauke R.
不同的认知过程在多大程度上得到了“体现”，引起了广泛的争论。以前的研究表明，感觉运动区，如外侧顶内(LIP)区，与知觉决策有关。这导致了一种观点，即知觉决定体现在指导身体运动的相同感觉运动网络中。我们使用事件相关功能磁共振成像和有效连通性分析来调查人类感觉运动系统是否执行知觉决策。我们表明，当眼睛和手的运动准备从知觉决定中分离出来时，感觉运动区不涉及积累感官证据以做出知觉决定。相反，额叶下部皮质增加了与代表证据的感觉区域的有效连接，受到证据数量的调节，并在知觉决策阶段显示出更大的任务积极大胆反应。然而，一旦眼球运动计划可以开始，顶沟(IPS)区域，即假定的嘴唇，就参与了运动决定。此外，感觉证据水平在不同的IPS区域调节决策和运动准备阶段的不同，表明IPS的功能异质性。这表明，不同的系统使用不同的神经信号来执行知觉决定与运动决定。
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.