Abstract
Cebus albifrons monkeys were used to study the relationship of the chiasmatic response evoked by light stimulation to various parameters of stimulation. The usual pattern of the gross response consisted of an early positive and a later positive-negative component which, to some extent, could be modified independently. Characteristics of these responses sugegst that they reflect respectively faster cone and slower rod modulation of retinal ganglion cell output. The appearance of a second positive wave under certain conditions is hypothesized to represent activity in a ‘slow’ cone-horizontal ganglion cell network. The technique of isolating rod and cone contributions by temporal evaluation of the flash-evoked, optic tract response is emphasized as a potential experimental tool. Responses to monochromatic stimuli of varying wave-length, utilizing this method of analysis as well as the electroretinogram, suggest that the species Cebus albifrons is deuteranopic rather than protanopic as previously reported.
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