PERCEIVED CONTRAST AS A FUNCTION OF ADAPTATION DURATION
PERCEIVED CONTRAST AS A FUNCTION OF ADAPTATION DURATION
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DOI：
10.1016/0042-6989(94)90254-2
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发表时间：
1994-01-01
期刊：
影响因子：
1.8
通讯作者：
SMITH, AT
中科院分区：
文献类型：
--
作者：
HAMMETT, ST;SNOWDEN, RJ;SMITH, AT
测量正弦光栅的感知对比度如何作为时间的函数衰减。测量了一系列的时间和空间频率和偏心率。高时间和低空间频率的模式表现出更大和更快的损失明显的对比度（褪色）比中频。当呈现在外周而不是中央凹时，中等频率的子组的衰落率和衰落量增加。进一步的测量表明，光栅的不同的空间频率，但具有相同的阈值灵敏度，表现出非常不同的衰落特性，但相同的阈值高程。我们的结论是，明显的对比度的差异损失是不是一个人工制品的不同接近阈值，也不能占在阈值的基础时空机制的适应性的差异。因此，衰落的差异可以反映高于阈值的底层通道的适应性的差异或者这些通道对感知对比度的差异贡献。
The measured how the perceived contrast of a sinusoidal grating fades as a function of time. Measurements were made for a range of temporal and spatial frequencies and eccentricities. Patterns of high temporal and low spatial frequency exhibited a greater and more rapid loss of apparent contrast (fade) than those of medium frequencies. The rate and amount of fading for a subgroup of moderate frequencies increased when presented peripherally rather than foveally. Further measurements revealed that gratings of disparate spatial frequencies, but with the same threshold sensitivity, exhibit very different fading characteristics but equal threshold elevation. We conclude that the differential loss of apparent contrast is not an artefact of differing proximities to threshold, nor can it be accounted for by differences in the adaptability of underlying spatio-temporal mechanisms at threshold. The differences in fading may thus reflect either a difference in the adaptability of underlying channels above threshold or a differential contribution of such channels to perceived contrast.