2015年3月14日土曜日

Orbitofrontal Cortex Uses Distinct Codes for Different Choice Attributes in Decisions Motivated by Curiosity

Tommy C. Blanchard, Benjamin Y. Hayden, Ethan S. Bromberg-Martin
Neuron, Volume 85, Issue 3, 4 February 2015, Pages 602–614

好奇心に基づく意思決定において、眼窩前頭皮質(OFC)のニューロンは「意思決定に重要なそれぞれの変数」をコードしているが、「それらを統合した価値」はコードしていない。
→ OFCは意思決定のプロセスの初期段階に関与しているのでは。

Decision makers are curious and consequently value advance information about future events. We made use of this fact to test competing theories of value representation in area 13 of orbitofrontal cortex (OFC). In a new task, we found that monkeys reliably sacrificed primary reward (water) to view advance information about gamble outcomes. While monkeys integrated information value with primary reward value to make their decisions, OFC neurons had no systematic tendency to integrate these variables, instead encoding them in orthogonal manners. These results suggest that the predominant role of the OFC is to encode variables relevant for learning, attention, and decision making, rather than integrating them into a single scale of value. They also suggest that OFC may be placed at a relatively early stage in the hierarchy of information-seeking decisions, before evaluation is complete. Thus, our results delineate a circuit for information-seeking decisions and suggest a neural basis for curiosity.

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