2012年10月4日木曜日

In Monkeys Making Value-Based Decisions, LIP Neurons Encode Cue Salience and Not Action Value


Marvin L. Leathers, Carl R. Olson
Science 5 October 2012: Vol. 338 no. 6103 pp. 132-135

LIPニューロンの活動は「報酬の量」にも「罰の量」にも正の相関がある。つまり、価値ではなく(価値なら、罰の量には負相関するはず)、Salience(顕著性)をコード。で、顕著性は意思決定にどう効いてくるのだろう?やっぱり学習率なのかな?

In monkeys deciding between alternative saccadic eye movements, lateral intraparietal (LIP) neurons representing each saccade fire at a rate proportional to the value of the reward expected upon its completion. This observation has been interpreted as indicating that LIP neurons encode saccadic value and that they mediate value-based decisions between saccades. Here, we show that LIP neurons representing a given saccade fire strongly not only if it will yield a large reward but also if it will incur a large penalty. This finding indicates that LIP neurons are sensitive to the motivational salience of cues. It is compatible neither with the idea that LIP neurons represent action value nor with the idea that value-based decisions take place in LIP neurons.

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