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SPEED OF PROCESSING IN THE HUMAN VISUAL SYSTEM

机译:人体视觉系统中的处理速度

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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 goo-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. [References: 28]
机译:人类视觉系统处理复杂的自然图像需要多长时间?从主观上讲,熟悉物体和场景的识别实际上是瞬间的,但是实验上测量该处理时间已被证明是困难的。可以使用行为措施,例如反应时间(1),但这些措施不仅包括视觉处理,还包括响应执行所需的时间。但是,与事件相关的电位(ERP)有时可以在电机输出之前就显露出神经处理的迹象(2)。在这里,我们使用“通过/不通过”分类任务,在该任务中,被摄对象必须确定以前看不见的仅闪烁20毫秒的照片是否包含动物。 ERP分析显示,刺激试验开始后约150毫秒发展为不进行试验的额叶阴性。我们得出的结论是,执行此高要求任务所需的视觉处理可以在150毫秒内完成。 [参考:28]

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