Abstract
The ability for discriminating large, simple patterns within the hemianopic field has been tested in six subjects hemidecorticated in early life for infantile hemiplegia-epilepsia, and seen in a previous study to have preserved localization capacities within this hemifield. Controls of the experimental procedure were done in two other Ss with a pregeniculate (chiasmatic) lesion. In hemidecorticated Ss, the cumulative score, across all sessions, exceeded the chance level in two Ss. The same was observed when all the scores of the 6 Ss were cumulated. This was not so in control Ss. Thus, coarse pattern discrimination could also be subserved in parts of the visual fields no longer controlled by cortical areas. These results are discussed regarding animal lesions experiments.
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