Light adaptation in motion direction judgments.
Light adaptation in motion direction judgments.
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运动方向判断中的光适应。
DOI：
--
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发表时间：
2001
影响因子：
1.9
通讯作者：
Isamu Motoyoshi
中科院分区：
文献类型：
--
作者：
T. Takeuchi;K. D. Valois;Isamu Motoyoshi
我们研究了视觉运动系统中光适应的时间过程。受试者判断两帧视在运动显示的方向，这两帧由相同平均亮度的50 ms刺激间隔分开。在每次试验中随机确定第一帧的相位。第二帧中呈现的光栅相对于第一帧中的光栅相移π/2或π/2。在第一帧期间的某个可变点处，图案的平均亮度增加或减少1-3个对数单位。平均亮度水平从暗视觉或低中间视觉到明视觉水平变化。我们发现，运动的感知方向共同取决于第一帧光栅的亮度水平和平均亮度发生偏移的时间。当平均亮度在第一帧的偏移之前至少0.5s从暗视觉或中间视觉增加到明视觉水平时，感知到3 pi/2方向上的运动。当平均亮度降低到低中间视觉或暗视觉水平时，如果变化发生在第一帧偏移之前1.0 s或更长时间，则感知到pi/2方向上的运动，这取决于亮度步长的大小。因此，视觉运动系统中的光适应基本上在1 s内完成。这表明，一个快速变化的形状（双相或双相）的时间脉冲响应函数，饲料到一阶运动机制。
We examined the time course of light adaptation in the visual motion system. Subjects judged the direction of a two-frame apparent-motion display, with the two frames separated by a 50-ms interstimulus interval of the same mean luminance. The phase of the first frame was randomly determined on each trial. The grating presented in the second frame was phase shifted either leftward or rightward by pi/2 with respect to the grating in the first frame. At some variable point during the first frame, the mean luminance of the pattern increased or decreased by 1-3 log units. Mean luminance levels varied from scotopic or low mesopic to photopic levels. We found that the perceived direction of motion depended jointly on the luminance level of the first frame grating and the time at which the shift in average luminance occurs. When the average luminance increases from scotopic or mesopic to photopic levels at least 0.5 s before the offset of the first frame, motion in the 3pi/2 direction is perceived. When average luminance decreases to low mesopic or scotopic levels, motion in the pi/2 direction is perceived if the change occurs 1.0 s or more before first frame offset, depending on the size of the luminance step. Thus light adaptation in the visual motion system is essentially complete within 1 s. This suggests a rapid change in the shape (biphasic or monophasic) of the temporal impulse response functions that feed into a first-order motion mechanism.
傅立叶模型和适应轨迹。
DOI：
10.1364/josaa.14.002323
发表时间：
1997
期刊：
Journal of the Optical Society of America. A, Optics, image science, and vision
影响因子：
--
作者：
Makous,WL
通讯作者：
Makous,WL
DOI：
10.1364/josaa.4.001992
发表时间：
1987-10
期刊：
Journal of the Optical Society of America. A, Optics and image science
影响因子：
--
作者：
W. Swanson;T. Ueno;V. Smith;J. Pokorny
通讯作者：
W. Swanson;T. Ueno;V. Smith;J. Pokorny