2015年3月10日火曜日

A category-free neural population supports evolving demands during decision-making

David Raposo, Matthew T Kaufman & Anne K Churchland
Nature Neuroscience 17, 1784–1792 (2014)

後部頭頂皮質はカテゴリー(視覚刺激、嗅覚刺激)に関係なく「知覚的意思決定」に関与している。

The posterior parietal cortex (PPC) receives diverse inputs and is involved in a dizzying array of behaviors. These many behaviors could rely on distinct categories of neurons specialized to represent particular variables or could rely on a single population of PPC neurons that is leveraged in different ways. To distinguish these possibilities, we evaluated rat PPC neurons recorded during multisensory decisions. Newly designed tests revealed that task parameters and temporal response features were distributed randomly across neurons, without evidence of categories. This suggests that PPC neurons constitute a dynamic network that is decoded according to the animal's present needs. To test for an additional signature of a dynamic network, we compared moments when behavioral demands differed: decision and movement. Our new state-space analysis revealed that the network explored different dimensions during decision and movement. These observations suggest that a single network of neurons can support the evolving behavioral demands of decision-making.

0 件のコメント:

コメントを投稿