Spectral sensitivity of the turtle, Pseudemys.

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Abstract
The erg. of the turtle was recorded, using conventional techniques. Records were examined in regard to wave form, changes with stimulus intensity, and relative spectral sensitivity. With 1 animal, a study of spectral sensitivity based on its performance in a discrimination box also was made. The erg. manifested a series of positive waves in addition to a smooth, positive B wave component. Waves became more numerous and of larger amplitude with stimuli of increasing intensity. Erg. spectral sensitivity measured in the dark-adapted eye was found to be greatest for long wave-length stimuli, regardless of whether the whole response or the individual waves were considered. Spectral sensitivity on a behavioral basis was markedly different and maximizes at a shorter wave length. These results are in agreement with the hypothesis that turtles possess both photopic and scotopic retinal mechanisms.

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