Milleret C, Buser P
Exp Brain Res. 1984;57(1):73-81. doi: 10.1007/BF00231133.
Receptive field sizes to stimulation of the ipsilateral temporal retina were studied in area 18 of adult cats at different times after complete midsagittal section of the optic chiasm. A specific postoperative evolution could thus be noticed: immediately after section, the average area of the receptive fields was reduced, as compared to control preparations, owing to the disappearance of large fields located at more than 20 degrees of eccentricity. A progressive reappearance of these large fields occurred between 8 and 45 days after chiasmotomy, provided that the animal was placed in normal visual conditions during its postoperative period. No such recovery could be assessed after as long as 55 days, in animals kept in complete darkness after operation. Chiasmotomized cats also displayed a reduction of their percentage of light reactive cells with respect to controls, as expected from the suppression of the contralateral input. This percentage was at first very low and progressively increased, during postoperative recovery but again not when the animal had been kept in the dark. Finally, an increase of cells with "diffuse responses" was observed in the late postoperative recovery stage. This latter evolution also appeared to depend upon postoperative visual experience. On the other hand, no clear indication of an interhemispheric transfer could be obtained in these experiments, even at the 17-18 boundary.
在视交叉完全矢状中切术后的不同时间，研究了成年猫18区对同侧颞侧视网膜刺激的感受野大小。由此可以观察到一种特定的术后演变：切断后立即发现，与对照标本相比，感受野的平均面积减小，这是由于位于偏心率超过20度处的大视野消失所致。如果动物在术后期间处于正常视觉条件下，在视交叉切断术后8至45天会逐渐重新出现这些大视野。在术后长达55天之后，对术后一直置于完全黑暗环境中的动物无法评估到这种恢复情况。正如对侧输入被抑制所预期的那样，视交叉切断的猫相对于对照而言，其光反应细胞的百分比也有所降低。这个百分比起初非常低，在术后恢复过程中逐渐增加，但当动物一直处于黑暗环境中时则不会增加。最后，在术后恢复后期观察到具有“弥散反应”的细胞增多。后一种演变似乎也取决于术后的视觉体验。另一方面，即使在17 - 18区边界，这些实验中也未获得明确的半球间转移迹象。
