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首页> 美国卫生研究院文献>The Journal of Neuroscience >Temporal Windows in Visual Processing: Prestimulus Brain State and Poststimulus Phase Reset Segregate Visual Transients on Different Temporal Scales
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Temporal Windows in Visual Processing: Prestimulus Brain State and Poststimulus Phase Reset Segregate Visual Transients on Different Temporal Scales

机译：视觉处理中的时间窗口：刺激前脑状态和刺激后相重置将不同时间尺度上的视觉瞬变隔离开

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Dynamic vision requires both stability of the current perceptual representation and sensitivity to the accumulation of sensory evidence over time. Here we study the electrophysiological signatures of this intricate balance between temporal segregation and integration in vision. Within a forward masking paradigm with short and long stimulus onset asynchronies (SOA), we manipulated the temporal overlap of the visual persistence of two successive transients. Human observers enumerated the items presented in the second target display as a measure of the informational capacity read-out from this partly temporally integrated visual percept. We observed higher β-power immediately before mask display onset in incorrect trials, in which enumeration failed due to stronger integration of mask and target visual information. This effect was timescale specific, distinguishing between segregation and integration of visual transients that were distant in time (long SOA). Conversely, for short SOA trials, mask onset evoked a stronger visual response when mask and targets were correctly segregated in time. Examination of the target-related response profile revealed the importance of an evoked α-phase reset for the segregation of those rapid visual transients. Investigating this precise mapping of the temporal relationships of visual signals onto electrophysiological responses highlights how the stream of visual information is carved up into discrete temporal windows that mediate between segregated and integrated percepts. Fragmenting the stream of visual information provides a means to stabilize perceptual events within one instant in time.
机译：动态视觉既需要当前知觉表示的稳定性，又需要对随着时间的推移积累的感官证据的敏感性。在这里，我们研究时间分离和视觉整合之间这种复杂平衡的电生理特征。在具有短期和长期刺激发作异步（SOA）的前向掩膜范式中，我们操纵了两个连续瞬态的视觉持久性的时间重叠。人类观察者列举了在第二目标显示器中呈现的项目，作为从这种部分时间整合的视觉感知中读出的信息能力的量度。我们在不正确的试验中观察到面罩显示开始之前就观察到了更高的β屈光度，其中由于面罩和目标视觉信息的更强整合而导致枚举失败。此效果是特定于时间刻度的，区分了时间间隔较远（长SOA）的视觉瞬变的分离和整合。相反，对于简短的SOA试验，当按时正确隔离口罩和目标时，口罩发作会引起更强的视觉反应。对与目标相关的反应曲线的检查表明，诱发α相复位对于隔离那些快速的视觉瞬变很重要。研究视觉信号在电生理反应上的时间关系的这种精确映射，突出显示了视觉信息流是如何被雕刻到离散的时间窗中的，这些时间窗在隔离和集成的感知之间进行调节。分割视觉信息流提供了一种在一个瞬间内稳定感知事件的方法。

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