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Spectral sensitivity and purkinje shift in the retina of the lemon shark negaprion brevirostris

, : Spectral sensitivity and purkinje shift in the retina of the lemon shark negaprion brevirostris. Vision Research 17(7): 787-792

Spectral sensitivity of the lemon shark, N. brevirostris, was determined using the ERG [electroretinogram] from the intact animal under scotopic and photopic conditions. A Purkinje shift was found upon moderate light adaptation. The peak of the scotopic spectral sensitivity function did not match the .lambda.max [wavelength for maximum absorption] of the pigment. Recordings from the isolated retina and eyecup preparation were made to see if the pre-retinal media or tapetum lucidum influenced spectral sensitivity. Only the tapetum had a slight effect. There may be a cone input influencing scotopic spectral sensitivity.

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