Background A successful therapeutic course in children infected with HIV relies heavily on their adherence to antiretroviral treatment (ART). The adherence is influenced by every child’s particularities, his family or caregivers and, last but not least, by the selected therapeutic regimen. In newborns and toddlers, who depend completely on their family or caregivers, issues affecting adherence ...

Imitation has long been considered a mechanism for the development of conscience. Despite the central role of imitation in theories of moral internalization, the prediction from imitation to moral behavior has not been tested using an individual differences approach. In a longitudinal design, we examined whether individual differences in toddlers' responsive imitation predict preschool-age cons...

Visual learning depends on both the algorithms and the training material. This essay considers the natural statistics of infant- and toddler-egocentric vision. These natural training sets for human visual object recognition are very different from the training data fed into machine vision systems. Rather than equal experiences with all kinds of things, toddlers experience extremely skewed distr...

Previous studies indicate that English-learning children acquire the distinction between singular and plural nouns between 22 and 24 months of age. Also, their use of the distinction is correlated with the capacity to distinguish nonlinguistically between singular and plural sets in a manual search paradigm (D. Barner, D. Thalwitz, J. Wood, S. Yang, & S. Carey, 2007). The authors used 3 experim...

The current study investigated the interaction of implicit grammatical gender and semantic category knowledge during object identification. German-learning toddlers (24-month-olds) were presented with picture pairs and heard a noun (without a preceding article) labeling one of the pictures. Labels for target and distracter images either matched or mismatched in grammatical gender and either mat...

Three studies (N=144) investigated how toddlers aged 18 and 24 months pass the surprise-mark test of self-recognition. In Study 1, toddlers were surreptitiously marked in successive conditions on their legs and faces with stickers visible only in a mirror. Rates of sticker touching did not differ significantly between conditions. In Study 2, toddlers failed to touch a sticker on their legs that...

Two separate studies examined older siblings' influence on the language exposure and language development of U.S.-born toddlers who were being raised in bilingual homes. The participants in Study 1 were 60 children between 16 and 30 months who had heard English and another language at home from birth; 26 had older siblings and 34 did not. The participants in Study 2 were 27 children, assessed a...

The current study tests a novel latent construct reflecting psychological absence and examines its relations with maternal depression, mother-toddler interactions, and toddlers' social-emotional outcomes in a low-income sample (N = 2,632). Structural equation modeling confirmed a psychological absence construct and revealed that psychological absence, measured at the child's 36-month birthday-r...

English-learning toddlers of 21 and 22 months were taught a novel spatial word for four actions resulting in a tight-fit spatial relation, a relation that is lexically marked in Korean but not English (Choi & Bowerman, 1991). Toddlers in a control condition viewed the same tight-fit action events without the novel word. Toddlers' comprehension of the novel word was tested in a preferential-look...