The development of photopic and scotopic vision in the frog (R((Rana temporaria) was investigated, using the electroretinogram as an index of visual function. It was found that very young tadpoles always showed the spectral sensitivity typical of cone function, maximal at approximately 570 millimicrons, irrespective of their state of light-adaptation. As the tadpoles grew older the Purkinje shift developed progressively, only becoming complete after metamorphosis. This confirms the previous behavioural ...
Sixty-four male hooded rats were trained monocularly to respond to a single stimulus in a Grice discrimination box. Different groups received 20 trials per day for 2, 3, or 5 days. After training generalization to a novel stimulus was tested, both while Ss were using the trained eye and while they were using the untrained eye. The amount of stimulus generalization was similar for both eyes, but the general response ...
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