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首页> 外文期刊>Journal of Neurophysiology >Encoding of action history in the rat ventral striatum.
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Encoding of action history in the rat ventral striatum.

机译：大鼠腹侧纹状体中动作历史的编码。

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摘要

In a dynamic environment, animals need to update information about the rewards expected from their alternative actions continually to make optimal choices for its survival. Because the reward resulting from a given action can be substantially delayed, the process of linking a reward to its causative action would be facilitated by memory signals related to the animal's previous actions. Although the ventral striatum has been proposed to play a key role in updating the information about the rewards expected from specific actions, it is not known whether the signals related to previous actions exist in the ventral striatum. In the present study, we recorded neuronal ensemble activity in the rat ventral striatum during a visual discrimination task and investigated whether neuronal activity in the ventral striatum encoded signals related to animal's previous actions. The results show that many neurons modulated their activity according to the animal's goal choice in the previous trial, indicating that memory signals for previous actions are available in the ventral striatum. In contrast, few neurons conveyed signals on impending goal choice of the animal, suggesting the absence of decision signals in the ventral striatum. Memory signals for previous actions might contribute to the process of updating the estimates of rewards expected from alternative actions in the ventral striatum.
机译：在动态环境中，动物需要不断更新有关其替代行动所期望的回报的信息，以便为生存做出最佳选择。由于给定动作产生的奖励可以大大延迟，因此与动物先前行为相关的记忆信号将有助于将奖励与其因果行为联系起来。尽管已经提出腹侧纹状体在更新关于特定动作所期望的回报的信息方面起着关键作用，但是尚不清楚与腹侧纹状体中是否存在与先前动作有关的信号。在本研究中，我们在视觉辨别任务期间记录了大鼠腹侧纹状体中神经元的整体活动，并调查了腹侧纹状体中的神经元活动是否编码了与动物先前的行为有关的信号。结果表明，在先前的试验中，许多神经元根据动物的目标选择调节了它们的活动，表明在腹侧纹状体中可获得先前动作的记忆信号。相反，几乎没有神经元在即将进行的动物目标选择中传递信号，表明腹侧纹状体中没有决策信号。先前动作的记忆信号可能有助于更新腹侧纹状体中替代动作所期望的回报估计的过程。

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