Visual affect recognition
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Seventy eight infants aged five, seven and nine months participated in this cross-sectional experimental research. Infants' responses to the two-dimensional stimuli were assessed through preferential looking technique. We tested the hypothesis that face stimuli - compared to object-like stimuli - would attract infants' attention in such a way that infants would fail to intermodally perceive the numerical invariant. In conditions with objects and piano sounds varying in numerosity, boys managed to detect numerical invariant at seven months, whereas girls did so at five months. In conditions with social stimuli photo of the mother's face or photo of an unknown woman's face, accompanied by taped voice of the mother or of the unknown woman, infants' tendency to intermodally detect the numerical invariant was found to be reduced at all ages in both males and females.