Silveira L C, Heywood C A, Cowey A
Department of Physiology, Federal University of Pará, Belém, Brazil.
Behav Brain Res. 1989 Jan 1;31(3):291-4. doi: 10.1016/0166-4328(89)90012-0.
The averaged visually evoked cortical potential (VECP) in response to contrast reversal of a grating was measured on striate cortex over a range of spatial frequencies and contrasts. The response to binocular or monocular stimulation was almost abolished by unilateral section of the optic tract on the side of the recording, indicating that the transcallosal pathway makes little contribution to the VECP. Additional section of the corpus callosum, and application of spreading depression to the normal hemisphere shows that the small response following tract section was transcallosal. It was confined to stimuli of low spatial frequencies and high contrast.
在一系列空间频率和对比度条件下，测量了纹状皮层对光栅对比度反转的平均视觉诱发电位（VECP）。记录侧视神经束单侧切断后，双眼或单眼刺激的反应几乎消失，这表明胼胝体通路对VECP的贡献很小。额外切断胼胝体，并向正常半球施加扩散性抑制，结果表明，视神经束切断后的小反应是通过胼胝体的。它仅限于低空间频率和高对比度的刺激。
