The range of apprehension and sensory discrimination.

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Abstract
Hunter and Sigler have shown that the Bunsen-Roscoe Law is applicable (within limits) to the data on the span of visual apprehension. From this they conclude that the span of apprehension resolves itself into a span of visual discrimination and is thus to be explained in terms of photochemical retinal processes. On the basis of exptl. evidence which indicates that the span of apprehension is significantly different for monocular and binocular vision, it is argued in the present paper that although the processes are sensory, the critical determinants of the span may be central in nature and not peripheral at all. The validity of the photochemical functions in general is also to be scrutinized in the light of this analysis.

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