Introduction: Social knowledge is an important aspect of social cognition that pertains to broader knowledge of social concepts and norms. People with intellectual disabilities are more likely to experience mental health challenges, and it's important to pay special attention to how comorbid conditions can affect their social cognition skills,…

Purpose: Psychoacoustic data indicate that infants and children are less likely than adults to focus on a spectral region containing an anticipated signal and are more susceptible to remote masking of a signal. These detection tasks suggest that infants and children, unlike adults, do not listen selectively. However, less is known about children's…

Purpose: This study examined whether older adults remain perceptually flexible when presented with ambiguities in speech in the absence of lexically disambiguating information. We expected older adults to show less perceptual learning when top-down information was not available. We also investigated whether individual differences in executive…

Individuals with Down syndrome (DS) exhibit a behavioral phenotype of specific strengths and weaknesses, in addition to a generalized cognitive delay. In particular, adults with DS exhibit specific deficits in learning and memory processes that depend on the hippocampus, and there is some suggestion of impairments on executive function tasks that…

The aim of this study was to apply the Rasch model to an analysis of the psychometric properties of the Peabody Picture Vocabulary Test--III Form A (PPVT--IIIA) items with struggling adult readers. The PPVT--IIIA was administered to 229 African American adults whose isolated word reading skills were between third and fifth grades. Conformity of…

A study examined perceptual-weighting strategies and performance-audibility functions of 11 children with moderate hearing impairments (HI), 11 age-matched peers, 11 adults with moderate HI, and 11 typical adults. Results showed both hearing sensitivity and age effects. Listeners with HI required lower levels of audibility to achieve similar…

A study involving 36 children and 10 adults investigated development of auditory frequency and temporal resolution using simultaneous and backward masking of a tone. On the measure of frequency resolution, 6- year-olds performed as well as adults. However, for the backward masking task, 6-year-olds had higher threshold than adults. (Contains…

Two social factors and their interactive effects were examined as possible influences on children's detection and reporting of inconsistent statements. Factors were the stated intention and the age of the speaker. (PCB)

A study compared the way in which subjects belonging to four different age groups produced written recall and summary responses after being presented with a narrative story. A seventh-grade-level, 500-word story that contained 78 idea units was presented to two groups of adolescents (mean ages, 14.14 years and 17.55 years) and two groups of adults…

Longitudinal change in syntax comprehension and production skill, measured over six years, was modeled in 31 individuals (ages 5-20) with Down syndrome. The best fitting Hierarchical Linear Modeling model of comprehension uses age and visual and auditory short-term memory as predictors of initial status, and age for growth trajectory. (Contains…

The purpose of this study was to trace the development of children's understanding of emotions between the ages of 4 and 12. Twenty-four children at each of five age groups (4, 6, 8, 10, and 12), equally divided by sex, served as subjects. Three groups of tasks were administered: (1) the recognition of facial expressions from photographs, (2) the…

Several cross-sectional studies and one longitudinal study were conducted on the language abilities of various cohorts of persons with Down syndrome (ages 14-50). A gradual decrease in global cerebral metabolic rate (CMR) for both hemispheres and for each participant was documented, however, no language deterioration could be associated with CMR…