RESPONSES OF MACAQUE GANGLION-CELLS AND HUMAN OBSERVERS TO COMPOUND PERIODIC WAVE-FORMS
RESPONSES OF MACAQUE GANGLION-CELLS AND HUMAN OBSERVERS TO COMPOUND PERIODIC WAVE-FORMS
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DOI：
10.1016/0042-6989(93)90023-p
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发表时间：
1993-09-01
期刊：
影响因子：
1.8
通讯作者：
SMITH, VC
中科院分区：
文献类型：
--
作者：
KREMERS, J;LEE, BB;SMITH, VC
我们测量了猕猴视网膜神经节细胞对不同周期性波形（正弦，方波，快开和快关波形）的亮度和等亮度色度调制的反应。我们用峰谷检测器分析了响应。在低频率下，中心和偏离中心的大细胞（MC-）通路细胞表现出10倍以上的快速和快速关闭的频率分别响应。红亮（+L-M）和绿亮（+M-L）小细胞（PC-）通路细胞分别对快速红亮和快速绿亮等亮度色度波形显示出4倍的响应性。在一个相当的视网膜偏心，我们测量了心理物理阈值的亮度刺激和彩色刺激。我们的结论是，从心理物理学的亮度敏感性是一致的选择性检测通过MC-通路上和偏离中心的通道在视觉系统。在PC通路细胞数据中看到的复合周期波形之间的差异并没有发生在心理物理学中。在第二个分析中，细胞对正弦调制的响应被用来预测对方波和正弦波波形的线性响应。PC通路细胞在很宽的对比度范围内表现出线性时间行为，但MC通路细胞仅在低对比度亮度调制时表现出线性行为。使用这些线性拟合，我们实现了一个模型，将中央低通滤波的MC和PC的路径之前的峰谷检测器。该模型更好地捕获了时间尺度和对心理物理数据中发现的周期性波形的相对敏感性。
We measured responses of macaque retinal ganglion cells to different periodic waveforms (sinusoidal, square, rapid-on and rapid-off sawtooth waveforms) for both luminance and equiluminant chromatic modulation. We analyzed the responses with a peak-to-trough detector. At low frequencies, on-center and off-center magnocellular (MC-) pathway cells showed a ten-fold higher responsivity to the rapid-on and rapid-off sawtooth respectively. Red-on (+L-M) and green-on (+M-L) parvocellular (PC-) pathway cells showed a four-fold greater responsivity to rapid red-on and rapid green-on equiluminant chromatic sawtooth waveforms respectively. At an equivalent retinal eccentricity, we measured psychophysical thresholds for luminance stimuli and chromatic stimuli. We concluded that luminance sawtooth sensitivities from psychophysics are consistent with selective detection through MC-pathway on- and off-center channels in the visual system. The differences between the compound periodic waveforms seen in the PC-pathway cell data did not occur in the psychophysics. In a second analysis, cell responses to sinusoidal modulation were used to predict the linear response to square-wave and sawtooth waveforms. PC-pathway cells showed linear temporal behavior over a wide range of contrasts, but MC-pathway cells displayed linear behavior only for low-contrast luminance modulation. Using these linear fits, we implemented a model incorporating central low-pass filtering in the MC- and PC-pathways before the peak-to-trough detector. This model captured better the time scale and relative sensitivity to periodic waveforms found in the psychophysical data.