Cortical mechanisms of action selection: the affordance competition hypothesis
Cortical mechanisms of action selection: the affordance competition hypothesis
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DOI：
10.1098/rstb.2007.2054
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发表时间：
2007-09-29
影响因子：
6.3
通讯作者：
Cisek, Paul
中科院分区：
文献类型：
--
作者：
Cisek, Paul
自然界每时每刻都在向动物提出两个基本的实用问题：在当前可能的行动之间进行选择，以及指定这些行动的参数或指标。人们通常认为，大脑首先构建世界的表示，在此基础上建立知识并做出决策，然后通过计算和执行行动计划来解决这些问题。然而，神经生理学数据反对这种连续的观点。与此相反，这里提出，大脑处理感官信息，以指定，并行，目前可用的几个潜在的行动。这些潜在的行为相互竞争以进行进一步的处理，同时收集信息以使这种竞争偏向，直到选择单个响应。该假说认为，背侧视觉系统指定的行动，相互竞争的额顶叶皮层，而各种偏见的影响是由前额叶区和基底神经节。描述了一个计算模型，说明这种竞争可能发生在大脑皮层。该模型的模拟捕捉神经生理数据的定性特征，并再现各种行为现象。
At every moment, the natural world presents animals with two fundamental pragmatic problems: selection between actions that are currently possible and specification of the parameters or metrics of those actions. It is commonly suggested that the brain addresses these by first constructing representations of the world on which to build knowledge and make a decision, and then by computing and executing an action plan. However, neurophysiological data argue against this serial viewpoint. In contrast, it is proposed here that the brain processes sensory information to specify, in parallel, several potential actions that are currently available. These potential actions compete against each other for further processing, while information is collected to bias this competition until a single response is selected. The hypothesis suggests that the dorsal visual system specifies actions which compete against each other within the fronto- parietal cortex, while a variety of biasing influences are provided by prefrontal regions and the basal ganglia. A computational model is described, which illustrate show this competition may take place in the cerebral cortex. Simulations of the model capture qualitative features of neurophysiological data and reproduce various behavioural phenomena.