Speed of processing in the human visual system
Speed of processing in the human visual system
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DOI：
10.1038/381520a0
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发表时间：
1996-06-06
期刊：
影响因子：
64.8
通讯作者：
Marlot, C
中科院分区：
文献类型：
--
作者：
Thorpe, S;Fize, D;Marlot, C
人类视觉系统处理一幅复杂的自然图像需要多长时间？主观上，熟悉的物体和场景的识别似乎几乎是瞬间的，但实验证明很难测量这个处理时间。可以使用反应时间等行为指标（1），但这些指标不仅包括视觉处理，还包括响应执行所需的时间。然而，事件相关电位（ERP）有时可以在运动输出之前揭示神经处理的迹象（2）。在这里，我们使用了一个去/不去分类任务，其中受试者必须决定是否以前看不见的照片，闪光只有20毫秒，包含一个动物。ERP分析显示，特定于不去的试验，开发约150毫秒后刺激发作的正面负性。我们的结论是，执行这一高要求的任务所需的视觉处理可以在150毫秒内实现。
How long does it take for the human visual system to process a complex natural image? Subjectively, recognition of familiar objects and scenes appears to be virtually instantaneous, but measuring this processing time experimentally has proved difficult. Behavioural measures such as reaction times can be used(1), but these include not only visual processing but also the time required for response execution. However, event-related potentials (ERPs) can sometimes reveal signs of neural processing well before the motor output(2). Here we use a go/no-go categorization task in which subjects have to decide whether a previously unseen photograph, flashed on for just 20 ms, contains an animal. ERP analysis revealed a frontal negativity specific to no-go trials that develops roughly 150 ms after stimulus onset. We conclude that the visual processing needed to perform this highly demanding task can be achieved in under 150 ms.