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首页> 外文期刊>The European Journal of Neuroscience >The effect of reward expectation on the time course of perceptual decisions
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The effect of reward expectation on the time course of perceptual decisions

机译：奖励期望对感知决策时期的影响

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Perceptual discriminations can be strongly biased by the expected reward for a correct decision but the neural mechanisms underlying this influence are still partially unclear. Using functional magnetic resonance imaging (fMRI) during a task requiring to arbitrarily associate a visual stimulus with a specific action, we have recently shown that perceptual decisions are encoded within the same sensory-motor regions responsible for planning and executing specific motor actions. Here we examined whether these regions additionally encode the amount of expected reward for a perceptual decision. Using a task requiring to associate a gradually unmasked female vs. male picture with a spatially-directed hand pointing or saccadic eye movement, we examined whether the fMRI time course of effector-selective regions was modulated by the amount of expected reward. In both the pointing-selective parietal reach region (PRR) and the saccade-selective posterior intraparietal region (piPS), reward-related modulations were only observed after the onset of the stimulus, during decision formation. However, while in the PRR these modulations were specific for the preferred pointing response, the pi PS showed greater activity when either a saccadic or a pointing movement was associated with a greater reward relative to neutral conditions. Interestingly, the fusiform face area showed a similar reward-related but response-independent modulation, consistent with a general motivational signal rather than with a mechanism for biasing specific sensory or motor representations. Together, our results support an account of perception as a process of probabilistic inference in which top-down and bottom-up information are integrated at every level of the cortical hierarchy.
机译：感知鉴别可以通过预期的奖励来强烈偏向正确的决定，但这种影响的神经机制仍然不清楚。在需要任意任意将视觉刺激与特定动作任意相关联的任务期间使用功能磁共振成像（FMRI），我们最近显示了感知决策在负责规划和执行特定电机动作的同一感官电机区域内被编码。在这里，我们检查了这些地区是否另外编制了对感知决定的预期奖励金额。使用任务要求将逐渐取消遮挡的女性与阳影与空间的手指指向或扫视眼球运动相关联，我们检查了效应选择区域的FMRI时间过程是否被预期奖励的量调制。在指向选择性间隙区域（PRR）和扫视选择性后部地区（PIPS）中，在决策形成期间仅观察到刺激后的奖励相关调制。然而，虽然在PRR中，这些调制对于优选的指向响应特异，但是当扫视腺或指向运动与相对于中性条件相对于更大的奖励时，PI PS显示出更大的活动。有趣的是，梭形面积显示出类似的奖励相关但反应无关的调制，与通用动机信号一致，而不是用偏置特定感官或电动机表示的机制。我们的结果在一起支持感知作为概率推断的过程，其中自上而下和自下而上信息集成在皮质层次结构的每个级别。

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