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Dichotic perception and laterality in neonates

Groups of 4-day-old neonates (n = 40) were tested for dichotic discrimination and ear differences with the High-Amplitude-Sucking procedure. In Exp 1, dichotic speech discrimination was attested by comparison with a control group (n = 20). Furthermore, among those Ss who showed a substantial recovery of sucking response at least after 1 of the 2 syllable changes, it was observed that significantly more Ss manifested a stronger reaction to a right-ear change than to a left-ear change. In Exp 2, 4-day-old neonates were tested on syllable and music timbre discrimination. The significant Stimulus Type x Ear interaction observed suggests perceptual asymmetries indicative of precocious brain specialization. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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