2013年9月12日木曜日

Signals in inferotemporal and perirhinal cortex suggest an untangling of visual target information

Marino Pagan, Luke S Urban, Margot P Wohl & Nicole C Rust
Nature Neuroscience (2013) doi:10.1038/nn.3433
Received 09 January 2013 Accepted 08 May 2013 Published online 23 June 2013

複数の(視覚)目標の中からお目当てのモノを探すには、「何を探しているのか?という記憶情報」と「何がどこにあるのか?という視覚情報」を組み合わせて処理する必要がある。
このような処理は「inferotemporal cortex(下側頭皮質:IT)」から「perirhinal cortex(鼻周囲皮質:PRH)」へ情報が受け渡されることで行われている。

Finding sought visual targets requires our brains to flexibly combine working memory information about what we are looking for with visual information about what we are looking at. To investigate the neural computations involved in finding visual targets, we recorded neural responses in inferotemporal cortex (IT) and perirhinal cortex (PRH) as macaque monkeys performed a task that required them to find targets in sequences of distractors. We found similar amounts of total task-specific information in both areas; however, information about whether a target was in view was more accessible using a linear read-out or, equivalently, was more untangled in PRH. Consistent with the flow of information from IT to PRH, we also found that task-relevant information arrived earlier in IT. PRH responses were well-described by a functional model in which computations in PRH untangle input from IT by combining neurons with asymmetric tuning correlations for target matches and distractors.

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