Yu H B, Shou T D
Vision Research Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei 230027, China.
Sheng Li Xue Bao. 2000 Oct;52(5):411-5.
Using optical imaging based on intrinsic signals, we studied spatial frequency tuning characteristics of cat primary visual cortex at different visual topological locations. We found that the areas representing the peripheral visual field had null or very weak responses to high spatial frequency grating stimuli, whereas the areas representing the central visual field responded to the stimuli of a wide range of spatial frequencies with greater responses to high spatial frequencies. The more centered the corresponding visual field of the cortical area, the higher the cutoff spatial frequency. The spatial frequency tuning curves also tended to have a smooth shift along the cortical surface. The results above demonstrate that spatial frequency tuning characteristics of the primary visual cortex change according to different visual topological locations of the cortical areas, in addition to the existence of spatial frequency columns. It is suggested that the distribution of spatial frequency columns may be related to visual topology.
利用基于内在信号的光学成像技术，我们研究了猫初级视觉皮层在不同视觉拓扑位置的空间频率调谐特性。我们发现，代表外周视野的区域对高空间频率光栅刺激的反应为零或非常微弱，而代表中央视野的区域对广泛空间频率的刺激有反应，对高空间频率的反应更强。皮层区域对应的视野越靠近中心，截止空间频率越高。空间频率调谐曲线也倾向于沿皮层表面平滑移动。上述结果表明，除了存在空间频率柱外，初级视觉皮层的空间频率调谐特性还会根据皮层区域的不同视觉拓扑位置而变化。这表明空间频率柱的分布可能与视觉拓扑有关。
