2013年12月10日火曜日

Neuronal Origins of Choice Variability in Economic Decisions

Camillo Padoa-Schioppa
Neuron, Volume 80, Issue 5, 1322-1336, 4 December 2013

眼窩前頭野(OFC)には「選択肢の価値を保持するニューロン」、「実際に選択された選択肢の価値を保持するニューロン」がある。
二つの選択肢の価値がほぼ等しい際の選択はそれらのニューロンの活動で説明できる?
前者のタイプのニューロンの活動では説明できないが、後者のタイプのニューロンの意思決定の直前で説明できる。

To investigate the mechanisms through which economic decisions are formed, I examined the activity of neurons in the orbitofrontal cortex while monkeys chose between different juice types. Different classes of cells encoded the value of individual offers (offer value), the value of the chosen option (chosen value), or the identity of the chosen juice (chosen juice). Choice variability was partly explained by the tendency to repeat choices (choice hysteresis). Surprisingly, near-indifference decisions did not reflect fluctuations in the activity of offer value cells. In contrast, near-indifference decisions correlated with fluctuations in the preoffer activity of chosen juice cells. After the offer, the activity of chosen juice cells reflected the decision difficulty but did not resemble a race-to-threshold. Finally, chosen value cells presented an “activity overshooting” closely related to the decision difficulty and possibly due to fluctuations in the relative value of the juices. This overshooting was independent of choice hysteresis.

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