Caregivers of eight children with severe disabilities were asked to rank order, according to predicted client preference, a standard list of reinforcers and a list generated using a structured interview with caregivers. Systematic choice assessments were then conducted. Results indicated that caregiver predictions of client preferences were…

Two experiments examined visual attention in 5- to 13-year olds who were hearing or deaf with or without cochlear implants. Findings indicated that visual selective attention changes occurred around 8 years for all groups, with deaf children without cochlear implants performing less well than others. Differences between deaf children with and…

This study evaluated the effectiveness of a brief, 2-minute pre-session stimulus preference assessment in predicting the levels of responding of four students (ages 6-9) with profound multiple disabilities. Use of the identified preferred stimulus resulted in higher levels of student responding during the instructional condition across all four…

This study assessed the criterion validity of the photographic adaptive communication device (ACD) used in Oklahoma to interview individuals with developmental disabilities receiving services. The back-translation process identified photographs that were frequently incorrectly identified resulting in revision of the ACD for greater validity.…

This study investigated whether 9-month-olds used phonotactic cues to segment words from fluent speech. Results suggested that 9-month-olds use probabilistic phonotactics to segment speech into words, and that high- probability between-word clusters are interpreted as both word onsets and word offsets. (Author/KB)

A study using Metaphoric Triads Task (MTT) of 92 undergraduates found that subjects perceive event metaphors based on similarities in physical movement more frequently than object metaphors based on similarities in stationary characteristics even when presented in still pictures. The results also showed that motion information increases perception…

The speech perception abilities of 27 children (ages 6-8, 15 with specific language impairment (SLI)) were compared using natural and synthetic versions of speech stimuli. Previously reported findings were replicated for the synthetic speech but not natural speech. Use of inflectional morphology in obligatory contexts by children with SLI was not…

Habituated 2-, 5-, and 8-month-olds to visual stimuli following statistically predictable pattern, then showed the familiar pattern alternating with novel sequence of identical stimuli. Found significantly greater interest in novel sequence at all ages. Results support likelihood of domain general statistical learning in infancy and imply that…

A preferential looking procedure was used to investigate 7-month-olds' perception of positive and negative affective facial expressions in which a single vocal expression was concordant or discordant with the videotaped facial expression. Results indicated that 7-month-olds discriminated among happy, interested, angry, and sad expressions.…

This study used delayed nonmatching to sample (DNMS) to test the recognition memory function dependent on the medial temporal lobe. Results from three conditions of DNMS tests with 9- and 12-month-olds suggest that the critical late-maturing competence accounting for DNMS success is the ability to understand that the stimulus is a symbol or marker…

The origins of many of the basic concepts used in the experimental analysis of behavior can be traced to Pavlov's (1927/1960) discussion of unconditional and conditional reflexes in the dog, but often with substantial changes in meaning (e.g., stimulus, response, and reinforcement). Other terms were added by Skinner (1938/1991) to describe his…

Three pigeons discriminated between two sample stimuli (intensities of red light). The difficulty of the discrimination was varied over four levels. At each level, the relative reinforcer magnitude for the two correct responses was varied across conditions, and the reinforcer rates were equal. Within levels, discriminability between the sample…

Two experiments investigated the derived transfer of functions through equivalence relations established using a stimulus pairing observation procedure. In Experiment 1, participants were trained on a simple discrimination (A1+/A2-) and then a stimulus pairing observation procedure was used to establish 4 stimulus pairings (A1-B1, A2-B2, B1-C1,…

Two experiments used a mutual imitation paradigm to assess 9-, 14-, and 18-month-old infants' developing understanding of intentions in others. In the first study, 1 experimenter imitated the infants' actions, and another experimenter performed contingent but different actions on an identical toy. From 9 months of age, infants show discrimination…

The characteristics of scanning patterns between the ages of 6 and 26 weeks were investigated through repeated assessments of 10 infants. Eye movements were recorded using a corneal-reflection system while the infants looked at 2 dynamic stimuli: the naturally moving face of their mother and an abstract stimulus. Results indicated that the way…