Effects of task demands on the responses of color-selective neurons in the inferior temporal cortex
Effects of task demands on the responses of color-selective neurons in the inferior temporal cortex
复制标题
DOI：
10.1038/nn1823
复制
发表时间：
2007-01-01
影响因子：
25
通讯作者：
Komatsu, Hidehiko
中科院分区：
文献类型：
--
作者：
Koida, Kowa;Komatsu, Hidehiko
分类和细微辨别是视觉感知中的两种不同功能，我们可以根据情况或任务要求在这两种功能之间进行切换。为了探索视觉皮层神经元在这种情况下的行为，我们记录了两只猴子在接受颜色分类任务、颜色辨别任务和简单注视任务的训练后，在颞下皮质(IT)皮质中的颜色选择神经元的活动。许多IT神经元的活动随任务的不同而改变，尽管颜色选择性被很好地保存下来。大多数神经元在分类任务中表现出更强的反应。此外，对于整个IT神经元群体来说，有助于执行分类任务的信号得到了增强。这些结果表明，颜色选择性IT神经元对颜色类别的判断在分类任务中被促进，而在辨别任务中被抑制，这是其活动依赖于任务的调节的结果。
Categorization and fine discrimination are two different functions in visual perception, and we can switch between these two functions depending on the situation or task demands. To explore how visual cortical neurons behave in such situations, we recorded the activities of color-selective neurons in the inferior temporal ( IT) cortex of two monkeys trained to perform a color categorization task, a color discrimination task and a simple fixation task. Many IT neurons changed their activity depending upon the task, although color selectivity was well conserved. A majority of neurons showed stronger responses during the categorization task. Moreover, for the population of IT neurons as a whole, signals contributing to performing the categorization task were enhanced. These results imply that judgment of color category by color-selective IT neurons is facilitated during the categorization task and suppressed during the discrimination task as a consequence of task-dependent modulation of their activities.