IMPORTANCE OF CALLOSAL TRANSFER IN THE EXTRAMACULAR INHIBITION PHENOMENON ALONG THE HEMIOPIC BORDER

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Abstract
The hemiopic border may be demonstrated in normal subjects by 2‐object campimetry, as an inhibition of the perception of one of the objects. When two horizontally disparate objects pass the border, the perception of the first object is inhibited. After a certain distance where only one object can be seen, the first distinctly reappears. After a further movement the second object also becomes distinct. This phenomenon has been studied with various object sizes and distances. In 7 patients with agenesia corporis callosi no inhibition could be demonstrated, suggesting a callosal transfer in the normal inhibition.The inhibition phenomenon probably illustrates the adaptation mechanism which must exist in order to correlate the function of the two hemiretinae.