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The experiments which have been described made use of an optical testing situation which
permitted comparative studies, and which allowed the same essential stimulus variables to …

Albino rats reared in cages whose walls had mounted black circles and triangles against a
white background later learned a circle-triangle discrimination problem significantly faster …

Behavior of Light-and Dark-Reared Rats on a Visual Cliff From the 18th century to the
present, the empiricist and the nativist theories of depth perception have been vigorously …

Abstract" In one experiment, the effect of pattern exposure was tested by discrimination of
identical patterns and of similar patterns. In the other, the exposure pattern and the pattern to …

In the 1st experiment using rats Group 1 had cutout triangles and circles on the walls of the
living cages for 90 days, until discrimination training began; Group 2 had the forms exposed …

In the 1st experiment a single metal cutout pattern was mounted on the walls of the rat's
cage. Later a similar pattern was used as the positive or negative stimulus in a …

A test is made of the hypothesis that prolonged exposure to visually presented patterns may
facilitate discrimination of these patterns in a subsequent learning situation when the …

What does a newborn baby see when it first opens its eyes? This is a question which has
puzzled philosophers and psychologists for many years, though unfortunately it is …