価値に基づいた意思決定をするサルでは,LIPニューロンは,アクション値ではなく,キュー・サライエンスをコードする
Marvin L Leathers1, Carl R Olson
1Center for the Neural Basis of Cognition, Carnegie Mellon University, Mellon Institute, Room 115, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA. mleathers@cnbc.cmu.edu
Science (New York, N.Y.)
|October 9, 2012
まとめ
ラテラル・イントラペリエタル (LIP) ニューロンは,報酬と罰の両方をシグナルし,動機付けの突出性に敏感であることを示します. これは,LIPニューロンが意思決定における行動価値のみをコードするという見解に異議を唱える.
科学分野:
- 神経科学は神経科学である.
- 意思決定 研究 意思決定
- 霊長類の認知能力について
背景:
- 類人猿の側頭部内側頭部 (LIP) ニューロンは,潜在的なサッカディックな眼球運動の値をコードすると考えられてきました.
- 以前の解釈では,LIPニューロンは,期待される報酬に比例して発火することで,価値に基づく意思決定を仲介することを示唆していました.
研究 の 目的:
- LIPニューロンの報酬価値を超えた意思決定における役割を調査する.
- LIPニューロンがネガティブな結果 (ペナルティ) とポジティブな結果 (報酬) に敏感であるかどうかを判断する.
主な方法:
- サカディックな目の動きのタスクを実行しているサルにおけるLIPニューロンからの電気生理学的記録.
- 異なるサッカードターゲットに関連した期待される報酬と罰則を操作する.
主要な成果:
- LIPニューロンは,大きな報酬に関連するサッカードだけでなく,大きな罰則に関連するサッカードにも強く発火しました.
- これは,LIPニューロンが,潜在的利益と損失の両方を反映したシグナルの動機付けの重要性に敏感であることを示しています.
結論:
- LIPニューロンは,行動価値のみを表しているのではなく,動機付けの重要性の処理に関与しています.
- この発見は,LIPニューロンがサッカドの間の価値ベースの決定を直接仲介するという仮説に異議を唱え,刺激の重要性を表現する上でより広範な役割を示唆しています.
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