Qualitative and quantitative responses to a frustration situation in a sample of 1-year-old normal infants are described. The findings indicated considerable variation in the quality of affect and the span of interest. In 1 group of infants, negative affect developed in a relatively short period of time and resulted in disruption of Merest; in another group of infants, no negative affect developed but instead, a shift in their focus of interest occurred. There was a significant difference in the latency of these two responses. In addition, a small but significant sex effect was observed-females tending to have relatively shorter spans of interest. There was no significant effect on these responses due to variations in age, developmental maturity or maternal parity.In the course of informally observing normal infants during their first year of development and, in particular, their responses to frustrating situations, it became clear that there were marked individual From the
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