A robust finding in humans and animals is that intermixed exposure to 2 similar stimuli (AX/BX) results in better discriminability of those stimuli on test than does exposure to 2 equally similar stimuli in 2 separate blocks (CX_DX)--the intermixed-blocked effect. This intermixed-blocked effect may be an example of the superiority of spaced over…

Results of an experiment using perception and discrimination learning tests showed that, in children, perception is affected by labels, perceptual learning, and selective attention. These effects are determined developmentally. As age increases, the effects of verbal clues decrease and those of perceptual clues increase. (PMJ)

Investigated early determinants of infants' self--other discrimination when presented with a live image of themselves or another person that was either contingent or contingent with delay. Found that infants 4 months and older perceived and acted differently when facing the image of themselves compared to that of another; 9-month-olds showed more…

The study examined 2 procedures--the ABX Test and the Oddity Task--for assessing the perception of 25 elementary grade phonologically disordered children of their own speech error sounds. Findings indicated both measures were promising and aided in identifying children whose perceptual errors influenced their speech-sound production. (DB)

Presents the results of a study designed to test ability to discriminate sound intensity modulations. Examines time required for making correct discriminations of stimuli that increased, decreased, or remained the same in intensity. Concludes that both musicians and nonmusicians perceive intensity decreases more easily than increases. (DK)