Detection of coherent movement in peripherally viewed random-dot patterns.
Detection of coherent movement in peripherally viewed random-dot patterns.
复制标题
检测外围观察的随机点图案中的相干运动。
DOI：
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发表时间：
1983
影响因子：
--
通讯作者：
J. Koenderink
中科院分区：
文献类型：
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作者：
W. A. van de Grind;A. van Doorn;J. Koenderink
我们研究了中心凹视觉频闪运动随机点图案以及在时间视野中6、12、24和48度偏心的相干运动的检测。阈值信噪比(SNR)被确定为一定刺激大小范围内的速度的函数。研究发现，运动检测性能在整个时间视野中大致不变，前提是根据皮质放大系数对刺激进行缩放，以获得在所有偏心率下相等的皮质大小和速度。与相干运动感知相适应的最大场速随着正方形刺激宽度的增加而线性增加。在这种高速阈值下，无论刺激大小或偏心程度如何，任何像素都会以50-90毫秒的恒定总时间以5到9个相等的步长穿过视野。在最佳或调谐速度V0时达到最低的SNR值。对于大的刺激和所有的怪癖，他们接近令人惊讶的0.04-0.05的低值。无论刺激大小，参数V0随着偏心率从中央凹的大约1度秒-1到时间视野48度的大约8度秒-1呈线性增加。
We studied the detection of coherent motion in stroboscopically moving random-dot patterns for foveal vision and at eccentricities of 6, 12, 24, and 48 deg in the temporal visual field. Threshold signal-to-noise ratios (SNR's) were determined as a function of velocity for a range of stimulus sizes. It was found that the motion-detection performance is roughly invariant throughout the temporal visual field, provided that the stimuli are scaled according to the cortical magnification factor to obtain equivalent cortical sizes and velocities at all eccentricities. The maximum field velocity compatible with the percept of coherent motion increased about linearly with the width of the square stimuli. At this high-velocity threshold any pixel crossed the field in five to nine equal steps with a constant total crossing time of 50-90 msec, regardless of stimulus size or eccentricity. The lowest SNR values were reached at the optimal or tuning velocity V0. They approached the amazingly low values of 0.04-0.05 for large stimuli and at all eccentricities. Regardless of stimulus size, the parameter V0 increased about linearly with eccentricity from roughly 1 deg sec-1 at the fovea to some 8 deg sec-1 at 48 deg in the temporal visual field.
影响因子：
2.5
作者：
MAUNSELL, JHR;VANESSEN, DC
通讯作者：
VANESSEN, DC