Imperceptibly rapid contrast modulations processed in cortex: Evidence from psychophysics.

Imperceptibly rapid contrast modulations processed in cortex: Evidence from psychophysics.
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DOI:
10.1167/10.8.21
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发表时间:
2010-07-01
期刊:
影响因子:
1.8
通讯作者:
MacLeod DI
MacLeod DI
中科院分区:
医学4区
文献类型:
--
作者:
Falconbridge M;Ware A;MacLeod DI

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对比度的快速波动在我们的现代视觉环境中很常见。例如,在被荧光灯照亮的房间里,当观看CRT计算机显示器时,或者在电影院里看电影时,它们就会出现。由于我们没有意识到快速的变化,人们一直认为它们不会影响我们视觉系统的运行。通过周期性地快速反转固定图案的对比度,我们使图案本身以及调制对观察者来说是不可见的。我们表明,暴露在这些快速对比度调制的图案中会改变后续静止图案的处理方式;与对比度调制图案相似的图案比不同的图案需要更多的对比度才能检测到。我们提出的证据表明,这些变化是通过皮质调节的。总而言之,我们的发现表明,视觉系统的大脑皮层阶段对对比度反转序列的各个帧做出反应,即使是以高达每秒160帧的速度。
Rapid fluctuations in contrast are common in our modern visual environment. They arise, for example, in a room lit by a fluorescent light, when viewing a CRT computer monitor and when watching a movie in a cinema. As we are unconscious of the rapid changes, it has been assumed that they do not affect the operation of our visual systems. By periodically reversing the contrast of a fixed pattern at a rapid rate we render the pattern itself, as well as the modulations, invisible to observers. We show that exposure to these rapidly contrast-modulated patterns alters the way subsequent stationary patterns are processed; patterns similar to the contrast-modulated pattern require more contrast to be detected than dissimilar patterns. We present evidence that the changes are cortically mediated. Taken together, our findings suggest that cortical stages of the visual system respond to the individual frames of a contrast-reversed sequence, even at rates as high as 160 frames per second.
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