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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Spontaneous local variations in ongoing neural activity bias perceptual decisions
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Spontaneous local variations in ongoing neural activity bias perceptual decisions

机译：正在进行的神经活动中的自发局部变化会影响知觉决策

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摘要

Neural variability in responding to identical repeated stimuli has been related to trial-by-trial fluctuations in ongoing activity, yet the neural and perceptual consequences of these fluctuations remain poorly understood. Using functional neuroimaging, we recorded brain activity in subjects who reported perceptual decisions on an ambiguous figure, Rubin's vase-faces picture, which was briefly presented at variable intervals of ≥ 20 s. Prestimulus activity in the fusiform face area, a cortical region preferentially responding to faces, was higher when subjects subsequently perceived faces instead of the vase. This finding suggests that endogenous variations in prestimulus neuronal activity biased subsequent perceptual inference. Furnishing evidence that evoked sensory responses, we then went on to show that the pre- and poststimulus activity interact in a nonlinear way and the ensuing perceptual decisions depend upon the prestimulus context in which they occur.
机译：响应相同重复刺激的神经变异性与进行中的活动的逐次试验波动有关，但对这些波动的神经和知觉后果仍知之甚少。使用功能性神经成像技术，我们记录了受试者的大脑活动，这些受试者在一个模糊的人物（鲁宾的花瓶脸图片）上报告了感知决定，该图片以≥20 s的可变间隔短暂呈现。当受试者随后感觉到面部而不是花瓶时，梭形面部区域（皮层区域优先响应面部）的刺激活性较高。这一发现表明，刺激前神经元活动的内源性变异偏向了随后的知觉推断。提供能够引起感觉反应的证据，然后我们继续证明，刺激前和刺激后的活动以非线性方式相互作用，并且随之而来的知觉决定取决于刺激发生的环境。

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