Speech development occurs in highly variable environments; however, little is known about the effect of situational context on emerging infant vocalizations. At 4 time points (4, 6, 9, and 12 months), we longitudinally measured vocalizations of 104 White infant-caregiver dyads (41 girls) during three play contexts: book-sharing, toy play, and…

Purpose: This study aims to help researchers design observational measurement systems that yield sufficiently stable scores for estimating caregiver talk among caregivers of infant siblings of autistic and non-autistic children. Stable estimates minimize error introduced by facets of the measurement system, such as variability between coders or…

Words that describe sensory perception give insight into how language mediates human experience, and the acquisition of these words is one way to examine how we learn to categorize and communicate sensation. We examine the differential predictions of the typological prevalence hypothesis and embodiment hypothesis regarding the acquisition of…

The objective of this study was to evaluate the motor, cognitive and language development of babies living in two institutional contexts. Seventy babies participated in the study: 35 from prisons and 35 from shelters. Thirty-five mothers of hospitalized babies and 10 caregivers of hospitalized babies also participated in this study. The…

Independent locomotion is associated with a range of positive developmental outcomes, but unlike cognitive, linguistic, and social skills, acquiring motor skills requires infants to generate their own input for learning. We tested factors that shape infants' spontaneous locomotion by observing forty 12- to 22-month-olds (19 girls, 21 boys) during…

Sleep-related infant deaths are one of the top causes of infant mortality in the United States. A few behavior analytic studies have examined behavioral skills training to teach adults to arrange safe infant sleeping environments. These studies were conducted in an analogue environment, and no data were collected outside the training setting. The…

Infants at elevated likelihood of developing autism display differences in sensory reactivity, especially hyporeactivity, as early as 7 months of age, potentially contributing to a developmental cascade of autism symptoms. Caregiver responsiveness, which has been linked to positive social communication outcomes, has not been adequately examined…

Research has shown the importance of responsive caregiving for fostering positive development early in life; however, tools measuring these interactions are often impractical for larger scale intervention trials and in settings with resource constraints. The present study provides reliability and validity evidence from Sindh, Pakistan for a tool…

This doctoral study examined the function of baby massage in supporting early infant-carer attachment relationships among families facing stressful life experiences. It was designed in response to Bennett, Underdown and Barlow's [Bennett, C., A. Underdown, and J. Barlow. 2013. "Massage for Promoting Mental and Physical Health in Typically…

Several concepts exist to explain the human-nature relationship, including nature connection. This paper offers a reconceptualisation of the human-nature bond, based on the infant-parent bond and attachment theory. As such, this paper draws upon research on attachment theory and environmental psychology to draw parallels between the two. Initially…

Caregivers play an outsized role in shaping early life experiences and development, but we often lack mechanistic insight into "how" exactly caregiver behavior scaffolds the neurodevelopment of specific learning processes. Here, we capitalized on the fact that caregivers differ in how predictable their behavior is to ask if infants'…

The present study explored the association between the structural quality of child care, caregivers' sensitive responsiveness, children's involvement in play and activity in the setting, and children's expression of aggression. Eighty-four early childhood care settings were classified into either high (29) or low structural quality (55) based on…

New motor skills can shape how infants communicate with their caregivers. For example, learning to walk allows infants to move faster and farther than they previously could, in turn allowing them to approach their caregivers more frequently to gesture or vocalize. Does the link between walking and communication differ for infants later diagnosed…

It is known that infant-directed speech (IDS) plays a key role in language development. Previous research, however, has also identified significant variability across societies in terms of how often IDS occurs. For example, some studies report very little IDS in non-western, small-scale societies -- including children growing up in small-scale…

Purpose: Intentional communication acts, or purposefully directed vocalizations and gestures, are particularly difficult for infants at elevated likelihood for eventual diagnosis of autism. The ability to measure and track intentional communication in infancy thus has the potential to aid early identification and intervention efforts. This study…