A Purkinje shift in the spectral sensitivity of grey squirrels

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Abstract
The light-adapted spectral sensitivity of the grey squirrel was determined by an automated training method at a level about 6 log units above the squirrel''s absolute threshold. The maximum sensitivity is near 555 nm, under light-adapted conditions, compared with the dark-adapted maximum near 500 nm found by a similar method. Neither the light-adapted nor the dark-adapted behavior threshold agrees with electrophysiological findings using single flash techniques, but there is agreement with e.r.g. [electroretinogram] results obtained with sinusoidal stimuli.