The effect of familiarity on infants' social categorization capacity.

Recent studies indicate that a preference for people from one's own race emerges early in development. Arguably, one potential process contributing to such a bias has to do with the increased discriminability of own- vs. other-race faces-a process commonly attributed to perceptual narrowing of unfamiliar groups' faces, and analogous to the conceptual homogenization of out-groups. The present studies addressed two implications of perceptual narrowing of other-race faces for infants' social categorization capacity. In Experiment 1, White 11-month-olds' (N = 81) looking time at a Black vs. White face was measured under three between-subjects conditions: a baseline "preference" (i.e., without familiarization), after familiarization to Black faces, or after familiarization to White faces. Compared to infants' a priori looking preferences as revealed in the baseline condition, only when familiarized to Black faces did infants look longer at the "not-familiarized-category" face at test. According to the standard categorization paradigm used, such longer looking time at the novel (i.e., "not-familiarized-category") exemplar at test, indicated that categorization of the familiarized faces had ensued. This is consistent with the idea that prior to their first birthday, infants already tend to represent own-race faces as individuals and other-race faces as a category. If this is the case, then infants might also be less likely to form subordinate categories within other-race than own-race categories. In Experiment 2, infants (N = 34) distinguished between an arbitrary (shirt-color) based sub-categories only when shirt-wearers were White, but not when they were Black. These findings confirm that perceptual narrowing of other-race faces blurs distinctions among members of unfamiliar categories. Consequently, infants: a) readily categorize other-race faces as being of the same kind, and b) find it hard to distinguish between their sub-categories.

The Development of a Scarcity Bias.

Adults' attraction to rare objects has been variously attributed to fundamental biases related to resource availability, self-related needs, or beliefs about social and market forces. The current three studies investigated the scarcity bias in 11- and 14-month-old infants, and 3- to 6-year-old children (N = 129). With slight methodological modifications, participants had to choose between one of 10 same-kind-items (abundant resource), or the only one of a different kind (scarce resource). It was found that a robust preference for the scarce resource appeared only at age 5 years. Thus, although a scarcity bias is not present in infancy, it emerges prior to comprehension of market forces. Possible accounts of this developmental finding are discussed.

Cultural differences in the development of a preference for scarce objects.

Adults value scarce objects, such as rare precious stones and limited edition items. This valuation may derive from an understanding of market forces and sociological considerations, but it may also be related to more basic cognitive and motivational processes. The present studies addressed these possibilities by investigating the development and cross-cultural prevalence of a preference for scarce objects. Children (N = 366) from Israel and Taiwan, ranging from 4 to 11 years of age, were given a choice between a scarce and an abundant reward. We found that whereas a preference for the scarce appeared among Israelis by age 7, it never appeared among the Taiwanese. These findings indicate that a scarcity preference emerges already at age 7, but only among children living in a culture that emphasizes self-individuality. These findings are discussed in light of cultural accounts of the development of self-motivations. (PsycINFO Database Record (c) 2018 APA, all rights reserved).

Foundations of infants' social group evaluations.

Previous research has suggested that infants exhibit a preference for familiar over unfamiliar social groups (e.g., preferring individuals from their own language group over individuals from a foreign language group). However, because past studies often employ forced-choice procedures, it is not clear whether infants' intergroup preferences are driven by positivity toward members of familiar groups, negativity toward members of unfamiliar groups, or both. Across six experiments, we implemented a habituation procedure to independently measure infants' positive and negative evaluations of speakers of familiar and unfamiliar languages. We report that by 1 year of age, infants positively evaluate individuals who speak a familiar language, but do not negatively evaluate individuals who speak an unfamiliar language (Experiments 1 and 2). Several experiments rule out lower-level explanations (Experiments 3-6). Together these data suggest that children's early social group preferences may be shaped by positive evaluations of familiar group(s), rather than negative evaluations of unfamiliar groups.