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Infant smiling to nonsocial stimuli and the recognition hypothesis.

ZELAZO, PHILIP, R., and KOMER, M. JOAN. Infant Smiling to Nonsocial Stimuli and the Recognition Hypothesis. CHILD DEVELOPMENT, 1971, 42, 1327-1339. 20 home-reared male infants (mean age-13 weeks) were presented with either 3 levels of visual or 3 levels of auditory stimulation. Each S received 2 7-minute blocks of stimulation for 2 consecutive days. All 3 stimulus levels were presented during each block with each level lasting for 8 consecutive 8-second exposures. An analysis of variance of smiling frequency confirmed the prediction from the recognition hypothesis that the smiling pattern to unfamiliar stimuli would be curvilinear over blocks and days (p<.05). Smiling to the nonsocial auditory stimuli was clearly curvilinear, while the nonsocial visual data more closely approximated smiling to social visual stimuli reported in previous studies (Zelazo 1967, 1969).