Malonek D, Spitzer H
Department of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa.
Biol Cybern. 1989;60(6):469-75. doi: 10.1007/BF00204702.
The responses to visual stimuli of simple cortical cells show linear spatial summation within and between their receptive field subunits. Complex cortical cells do not show this linearity. We analyzed the simulated responses to drifting sinusoidal grating stimuli of simple and of several types of complex cells. The complex cells, whose responses are seen to be half-wave rectified before pooling, have receptive fields consisting of two or more DOG (difference-of-Gaussians) shaped subunits. In both cases of stimulation by contrast-reversal gratings or drifting gratings, the cells' response as a function of spatial frequency is affected by the subunit distances 2 lambda and the stimulation frequency omega. Furthermore, an increased number of subunits (a larger receptive field) yields a narrower peak tuning curve with decreased modulation depth for many of the spatial frequencies. The average and the peak response tuning curves are compared for the different receptive field types.
简单皮层细胞对视觉刺激的反应在其感受野亚单位内部和之间表现出线性空间总和。复杂皮层细胞则不表现出这种线性。我们分析了简单细胞和几种类型复杂细胞对漂移正弦光栅刺激的模拟反应。这些复杂细胞的反应在汇总之前被视为半波整流，其感受野由两个或更多个高斯差分（DOG）形状的亚单位组成。在对比度反转光栅或漂移光栅刺激的两种情况下，细胞作为空间频率函数的反应受亚单位距离2λ和刺激频率ω的影响。此外，对于许多空间频率而言，亚单位数量增加（感受野更大）会产生更窄的峰值调谐曲线，调制深度降低。比较了不同感受野类型的平均和峰值反应调谐曲线。
