Zihl J, von Cramon D
Exp Brain Res. 1979 May 2;35(3):419-24. doi: 10.1007/BF00236761.
Threshold elevation in the periphery of the visual field as a consequence of repetitive stimulation can be abolished by stimulating a mirror-symmetric position in the contralateral visual half-field. A patient suffering from a congenital malformation of the right superior colliculus did not exhibit threshold elevation when stimulated repeatedly in the left visual field. Stimulation in the right visual half-field resulted in the usually observed threshold elevation, but stimulating a mirror-symmetric position in the left visual half-field did not abolish threshold elevation in the right half-field. These observations suggest that: (a) threshold elevation probably occurs as a consequence of collicular adaptation and (b) the mirror-symmetrically organized interhemispheric interaction is mediated at the collicular level.
重复刺激导致的视野周边阈值升高可通过刺激对侧视觉半视野中的镜像对称位置来消除。一名患有右上丘先天性畸形的患者在左视野受到重复刺激时未表现出阈值升高。在右视觉半视野进行刺激会导致通常观察到的阈值升高，但在左视觉半视野刺激镜像对称位置并不能消除右半视野的阈值升高。这些观察结果表明：（a）阈值升高可能是由于丘适应引起的，（b）镜像对称组织的半球间相互作用是在丘水平介导的。
