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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Perceptual Competition Promotes Suppression of Reward Salience in Behavioral Selection and Neural Representation
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Perceptual Competition Promotes Suppression of Reward Salience in Behavioral Selection and Neural Representation

机译：感知竞争促进了行为选择和神经表征中的奖励显着性

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摘要

Visual attentional selection is influenced by the value of objects. Previous studies have demonstrated that reward-associated items lead to rapid distraction and associated behavioral costs, which are difficult to override with top-down control. However, it has not been determined whether a perceptually competitive environment could render the reward-driven distraction more susceptible to top-down suppression. Here, we trained both genders of human subjects to associate two orientations with high and low magnitudes of reward. After training, we collected fMRI data while the subjects performed a categorical visual search task. The item in the reward-associated orientation served as the distractor, and the relative physical salience between the target and distractor was carefully controlled to modulate the degree of perceptual competition. The behavioral results showed faster searches in the presence of high, relative to low, reward-associated distractors. However, this effect was evident only if the physical salience of the distractor was higher than that of the target, indicating a context-dependent suppression effect of reward salience that relied on high perceptual competition. By analyzing the fMRI data in primary visual cortex, we found that the behavioral pattern of results could be predicted by the suppressed channel responses tuned to the reward-associated orientation in the distractor location, accompanied by increased responses in the midbrain dopaminergic region. Our results suggest that the learned salience of a reward plays a flexible role in solving perceptual competition, enabling the neural system to adaptively modulate the perceptual representation for behavioral optimization.
机译：视觉注意力选择受到物体价值的影响。以前的研究表明，奖励相关的物品导致快速分散和相关的行为成本，这难以通过自上而下的控制来覆盖。然而，尚未确定感知竞争环境是否能够使奖励驱动的分心更容易对自上而下的抑制。在这里，我们培训了人类受试者的一部分，以使两个方向与高低奖励大小。在培训之后，我们在受试者执行了分类视觉搜索任务时收集了FMRI数据。奖励相关方向中的物品作为分散组织，仔细控制目标和患者之间的相对身体显着性以调制感知程度。行为结果在相对于低，奖励相关的干扰者的情况下，在高度的情况下显示出更快的搜查。然而，只有在患者的物理显着高于目标的情况下，这种效果才是显而易见的，这表明依赖于高感知竞争的奖励显着依赖性抑制效果。通过分析原发性视觉皮质中的FMRI数据，我们发现可以通过调谐到分散组位置中的奖励相关方向的抑制信道响应来预测结果的行为模式，伴随着中脑多巴胺能区域的增加。我们的结果表明，奖励的学习显着性在解决感知竞争方面发挥了灵活的作用，使神经系统能够自适应地调节行为优化的感知表示。

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