A dual role of prestimulus spontaneous neural activity in visual object recognition

A dual role of prestimulus spontaneous neural activity in visual object recognition
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刺激前自发神经活动在视觉物体识别中的双重作用

DOI:
10.1038/s41467-019-11877-4
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发表时间:
2019
影响因子:
16.6
通讯作者:
He, Biyu J.
He, Biyu J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Podvalny, Ella;Flounders, Matthew W.;King, Leana E.;Holroyd, Tom;He, Biyu J.

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视觉既依赖于视觉属性的特定知识,如物体类别,也依赖于一般的大脑状态,如反映唤醒的状态。我们假设,这些现象独立地影响识别即将到来的刺激,通过不同的过程反映在自发神经活动。在这里,我们记录了参与者(N= 24)的脑磁图(MEG)活动,他们观看了在识别阈值下呈现的物体图像。使用多变量分析应用到传感器水平的活动模式记录刺激呈现之前,我们确定了两个神经过程影响随后的主观识别:一个一般的过程,它忽略刺激类别和瞳孔大小相关,和一个特定的过程,这有利于特定类别的识别。这两个过程是双重分离的:一般过程与标准的变化相关,但与敏感性无关,而特定过程与敏感性的变化相关,但与标准无关。我们的研究结果揭示了自发神经活动如何影响感知的不同机制,并提供了一个框架来整合以前的研究结果。
Vision relies on both specific knowledge of visual attributes, such as object categories, and general brain states, such as those reflecting arousal. We hypothesized that these phenomena independently influence recognition of forthcoming stimuli through distinct processes reflected in spontaneous neural activity. Here, we recorded magnetoencephalographic (MEG) activity in participants (N= 24) who viewed images of objects presented at recognition threshold. Using multivariate analysis applied to sensor-level activity patterns recorded before stimulus presentation, we identified two neural processes influencing subsequent subjective recognition: a general process, which disregards stimulus category and correlates with pupil size, and a specific process, which facilitates category-specific recognition. The two processes are doubly-dissociable: the general process correlates with changes in criterion but not in sensitivity, whereas the specific process correlates with changes in sensitivity but not in criterion. Our findings reveal distinct mechanisms of how spontaneous neural activity influences perception and provide a framework to integrate previous findings.
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