SUSTAINED AND TRANSIENT CHANNELS IN HUMAN VISION
SUSTAINED AND TRANSIENT CHANNELS IN HUMAN VISION
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DOI：
10.1016/0042-6989(75)90014-0
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发表时间：
1975-01-01
期刊：
影响因子：
1.8
通讯作者：
TOLHURST, DJ
中科院分区：
文献类型：
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作者：
TOLHURST, DJ
正弦光栅的4毫秒闪烁的灵敏度在不同的时间期间和之后的亚阈值800毫秒闪烁的相同的空间频率的光栅确定。在2 c/deg及以下的频率下，对短闪光的灵敏度在长闪光的开始和偏移后瞬时改变约100 msec。如果光栅在长和短的闪光是空间上的相位，短闪光的灵敏度增加，在长闪光的开始，但在偏移量降低。180°的相移引起这些效应的反转。在更高的空间频率，短闪光的灵敏度增加到一个新的稳定水平的持续时间的长闪光，当光栅的相位。180°的相移不会引起反转：在长闪光的开始和结束时，灵敏度会发生瞬时变化。这可能表明响应的非线性，但有人认为，可以通过假设在这些空间频率存在两种类型的通道来解释结果。
The sensitivity for 4-msec flashes of sinusoidal grating was determined at various times during and after a subthreshold 800 msec flash of grating of the same spatial-frequency. At frequencies of 2 c/deg and below, the sensitivity to the short flash was transiently changed for about 100 msec after the onset and the offset of the long flash. If the gratings in the long and short flashes were spatially in phase, the sensitivity to the short flash was increased at the onset of the long flash but was decreased at the offset. A phase-shift of 180° caused an inversion of these effects. At higher spatial-frequencies, the sensitivity to the short flash was increased to a new steady level for the duration of the long flash, when the gratings were in phase. A phase-shift of 180° did not cause an inversion: the sensitivity was changed transiently at the onset and offset of the long flash. This might suggest a non-linearity of response, but it is argued that the results can be explained by supposing the existence of two types of channel at these spatial-frequencies.