Scanning of own- versus other-race faces in infants from racially diverse or homogenous communities.

We examined the role of community face experience on 6- and 8-month-old Caucasian infants' scanning of own- and other-race face scanning. We measured infants' proportional fixation time and scan path amplitudes as indices of face processing. Proportional fixation time to informationally rich face regions varied as a function of age and face race for infants living in a racially homogeneous community, whereas scan path amplitudes varied as a function of age and face race for infants living in a racially diverse community.

An eye-tracking investigation of developmental changes in infants' exploration of upright and inverted human faces.

We used eye-tracking to examine 4.5- to 12.5-month-old infants' ( = 92) eye-movements during 3-s presentations of upright and inverted faces.

Toddlers can adaptively change how they categorize: same objects, same session, two different categorical distinctions.

Two experiments demonstrate that 14- to 18-month-old toddlers can adaptively change how they categorize a set of objects within a single session, and that this ability is related to vocabulary size. In both experiments, toddlers were presented with a sequential touching task with objects that could be categorized either according to some perceptually salient dimension corresponding to a taxonomic distinction (e.g.

Infants flexibly use different dimensions to categorize objects.

A sequential-touching task was used to investigate whether 14-month-old infants can rapidly change how they categorize a set of objects, recognizing new groupings of objects they had previously categorized in a different way. When presented with a collection of objects that could be categorized by shape (balls vs. blocks) or material (soft vs.

The STARK study: a cross-sectional study of adherence to short-term drug regiments in urban Kenya.

The purpose of the STARK study (Short-Term Adherence Research in Kenya) was to identify factors that predict adherence to short-term drug regimens in Nairobi, Kenya. The participants (N = 357) in the study were recruited from the RAFIKI Foundation Clinic, a free primary healthcare clinic in Kibera, Nairobi's largest slum. Quantitative surveys were administered to all the participants regarding their adherence patterns and to a subgroup of mothers (N = 233) regarding their adherence in giving medicine to their children.