2013年7月10日水曜日

Reward Value-Contingent Changes of Visual Responses in the Primate Caudate Tail Associated with a Visuomotor Skill

Shinya Yamamoto, Hyoung F. Kim, and Okihide Hikosaka
J. Neurosci. 2013;33 11227-11238 Open Access
http://www.jneurosci.org/cgi/content/abstract/33/27/11227?etoc

サル電気生理。
環境(刺激と報酬量の関係)が長期に渡って安定している時、最適な意思決定が自動的にできるようになる。
その際、尾状核の後部(Caudate Tail)がその処理に関わっている。
(なお、環境が短期間に変化する場合は尾状核後部は意思決定には関わってこない)

A goal-directed action aiming at an incentive outcome, if repeated, becomes a skill that may be initiated automatically. We now report that the tail of the caudate nucleus (CDt) may serve to control a visuomotor skill. Monkeys looked at many fractal objects, half of which were always associated with a large reward (high-valued objects) and the other half with a small reward (low-valued objects). After several daily sessions, they developed a gaze bias, looking at high-valued objects even when no reward was associated. CDt neurons developed a response bias, typically showing stronger responses to high-valued objects. In contrast, their responses showed no change when object values were reversed frequently, although monkeys showed a strong gaze bias, looking at high-valued objects in a goal-directed manner. The biased activity of CDt neurons may be transmitted to the oculomotor region so that animals can choose high-valued objects automatically based on stable reward experiences.

0 件のコメント:

コメントを投稿