脑光学成像技术揭示的猫初级视皮层方位倾斜效应

The oblique effect revealed by optical imaging in primary visual cortex of cats

方位倾斜效应 (obliqueeffect)是人类普遍存在的视觉心理效应。为了检测其神经基础 ,我们采用脑光学成像方法 ,对猫初级视觉皮层较大范围内的水平 垂直方位光栅刺激敏感区和倾斜方位光栅刺激敏感区的大小及其反应强度进行了定量分析。结果表明 :水平 垂直敏感区比倾斜角敏感区面积大 ,平均差异为 4 7% ;水平 垂直方位刺激引起的反应强度整体上比倾斜角方位刺激大。以上结果澄清了以往一些电生理研究结果的不同 。

The oblique effect is a ubiquitous visual psychological effect. To explore its underlying neural basis, we quantitatively analyzed the proportion and response amplitude of the cardinal preferred areas and the oblique preferred areas in a fairly large region of the primary visual cortex of cats, using optical imaging based on intrinsic signals. The results show that cardinal preferred areas were larger than oblique preferred areas, with a mean difference of 4.7%. Overall, the responses evoked by cardinal stimuli were generally greater than those by oblique stimuli. The present work provides an explanation for the differences in electro^physiol^og^ical results reported for this issue, and gives a new insight into the neural basis of the oblique effect. [WT5HZ]