VISIBILITY OF TRANSIENT CHANGES OF LUMINANCE
VISIBILITY OF TRANSIENT CHANGES OF LUMINANCE
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DOI：
10.1113/jphysiol.1970.sp009202
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发表时间：
1970-01-01
影响因子：
5.5
通讯作者：
RASHBASS, C
中科院分区：
文献类型：
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作者：
RASHBASS, C
1. 测量了中明视范围内基线亮度的各种瞬态变化的阈值强度。 2. 亮度的矩形变化显示增量和减量之间没有差异，阈值强度与持续时间成反比降低，持续时间长达 16 毫秒，阈值减少幅度较小，持续时间长达 64 毫秒，并且对于较长的持续时间，阈值略有增加。 3. 间隔间隔的两次短暂闪烁显示在 10 毫秒时求和不完整，在 65 毫秒时几乎没有求和，在 100 毫秒时阈值第二次降低。 4. 两个相反方向的短暂闪光以非常小的间隔相互抵消，但以较长的间隔（最大为 65 毫秒）相互补充。 5.提出了一种探测器系统模型，该模型使激励波形通过带通滤波器，并取滤波器输出方差的运行平均值。如果该平均值达到一定水平，则达到阈值。 6. 该模型令人满意地解释了任何两个同时出现且持续时间不超过 100 毫秒的波形将相互作用的观察结果，使得它们在组合阈值处的关系将是椭圆形；如果一种波形是另一种波形的微分，则该椭圆将没有倾斜度。 7. 对由不同间隔分开的两次短暂闪光的阈值的测量定义了用于解释重复刺激的阈值的带通滤波器的衰减特性。 8. 该模型协调了不同持续时间的单次闪光阈值和不同间隔的成对闪光阈值之间的明显差异。 9. 讨论了这种系统的统计效率。
1. The threshold intensities of various transient changes from a base line luminance in the mid-photopic range have been measured. 2. Rectangular changes in luminance show no difference between increments and decrements, a threshold intensity decreasing inversely with durations up to 16 msec, a lesser reduction in threshold up to 64 msec and for longer durations a slight increase in threshold. 3. Two brief flashes separated by an interval show incomplete summation at 10 msec, almost no summation at 65 msec and a second reduction in threshold at 100 msec. 4. Two brief flashes in opposite directions negate each other at very small intervals but complement each other at longer intervals, maximally at 65 msec. 5. A model of the detector system is proposed that passes the stimulus wave form through a band-pass filter and takes a running average of the variance of the filter output. Threshold is reached if this average attains a certain level. 6. The model satisfactorily accounts for the observations that any two wave forms occurring together and not exceeding a total of 100 msec in duration will interact so that the relationship between them at the combined threshold will be an ellipse; and that this ellipse will have no obliquity if one wave form is the differential of the other. 7. Measurements of the thresholds of two brief flashes separated by various intervals define the attenuation characteristics of the band-pass filter invoked to explain the thresholds of repetitive stimuli. 8. The model reconciles the apparent disparity between the thresholds of single flashes of varying duration and pairs of flashes of varying interval. 9. The statistical efficiency of such a system is discussed.