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首页> 外文期刊>Neuron >Encoding of time-discounted rewards in orbitofrontal cortex is independent of value representation.
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Encoding of time-discounted rewards in orbitofrontal cortex is independent of value representation.

机译：眼眶额叶皮质中时间折扣奖励的编码与值表示无关。

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摘要

We monitored single-neuron activity in the orbitofrontal cortex of rats performing a time-discounting task in which the spatial location of the reward predicted whether the delay preceding reward delivery would be short or long. We found that rewards delivered after a short delay elicited a stronger neuronal response than those delivered after a long delay in most neurons. Activity in these neurons was not influenced by reward size when delays were held constant. This was also true for a minority of neurons that exhibited sustained increases in firing in anticipation of delayed reward. Thus, encoding of time-discounted rewards in orbitofrontal cortex is independent of the encoding of absolute reward value. These results are contrary to the proposal that orbitofrontal neurons signal the value of delayed rewards in a common currency and instead suggest alternative proposals for the role this region plays in guiding responses for delayed versus immediate rewards.
机译：我们监测了执行时限任务的大鼠眶额皮质中的单个神经元活动，其中奖励的空间位置预测了奖励交付之前的延迟是短还是长。我们发现，与大多数神经元长时间延迟后产生的奖励相比，短暂延迟后产生的奖励引起了更强的神经元反应。当延迟保持恒定时，这些神经元的活动不受奖励大小的影响。对于少数预期延迟奖励而持续放电的神经元也是如此。因此，眶额皮质中时间折扣奖励的编码独立于绝对奖励值的编码。这些结果与以下观点相反：眼眶额神经元以共同货币表示延迟奖励的价值，相反，该区域在指导延迟奖励和即时奖励的反应中起着替代作用。

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