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Infant behavioral state and speech sound discrimination.

In order to investigate the interaction between infant state and speech sound discrimination, records of state were obtained from infants participating in 3 speech sound discrimination experiments which employed the high amplitude sucking procedure. A total of 94 individual records were rated for state by 2 independent scorers. When treated as an independent variable, state interacted with responsivity to sound change as measured by sucking rate increases. Infants in the more alert states demonstrated significantly higher rates of sucking following sound change. Treating state as a dependent variable revealed that state was not significantly affected by a change in stimulus conditions.