Learning to categorize perceptually similar stimuli can result in people becoming more sensitive to differences along perceptual dimensions that are relevant to category membership and/or less sensitive to equivalent differences along irrelevant perceptual dimensions. These effects of acquired distinctiveness and acquired equivalence may be caused…

Describes two studies that demonstrate young children's perception of color materials differs from that of adults in two ways: (1) the stimulus dimensions of hue, chroma, and value appear to result in somewhat more separable perception for young children than for adults, and (2) the perceived similarities the color materials are not the same for…

Explored the notion that children's difficulty in reading is a sign of a general inability to selectively attend to parts of perceptual wholes. Children and adults classified triads of spoken syllables and visual objects. Classification of speech was related to reading and spelling ability, but not to classification of visual stimuli. (BC)