Revaluation manipulations produce emergence of underselected stimuli following simultaneous discrimination in humans

Stimulus overselectivity occurs when only one of potentially many aspects of the environment controls behaviour. In four experiments, human participants were trained and tested on a trial-and-error simultaneous discrimination task involving two two-element compound stimuli. Overselectivity emerged in all experiments (i.e., one element from the reinforced compound controlled behaviour at the expense of the other). Following revaluation (extinction) of the previously overselected stimulus, behavioural control by the underselected stimulus element emerged without any direct training of that stimulus element. However, while a series of extinction manipulations targeting the revaluation of the overselected stimulus produced differential extinction of that stimulus, they did not result in differential emergence of the previously underselected stimuli. The results are discussed with respect to the theoretical implications for attention-based accounts of overselectivity

An evaluation of the effects of a hospital unit on the development of multiply handicapped children

The evidence in this study appears to indicate that adopting a goal-planning approach can provide demonstrable and clear improvements in the developmental functioning of multiply handicapped blind children. However, while the improvements in functioning for self-help and sensorimotor abilities are quite significant, those for communication and language skills are much less so. Three possible hypotheses have been advanced as to why this should be so. The hypothesis that the setting might be an institutionalizing one was rejected on the grounds that some of the evidence did not fit with that from other populations. The second hypothesis referred to the lack of formal speech and communication training on the unit. The best possible test of this hypothesis would be to employ a speech therapist to work on the unit and support for such a scheme is being sought. Finally, it was hypothesized that the way in which the staff interacted with the children was not being sufficiently modified to take account of the children's handicaps

Cognitive and adaptive behavior outcomes of behavioral intervention for young children With intellectual disability

Data from Norway were analyzed to evaluate early behavioral intervention for children with intellectual disabilities. The intervention group (n = 11) received approximately 10 hours per week of behavioral intervention; the eclectic comparison group (n = 14) received treatment as usual. After 1 year, changes in intelligence and adaptive behavior scores were statistically significant in favor of the behavioral intervention group (effect sizes of 1.13 for Intelligence quotient (IQ) change and .95 for change in adaptive behavior composite). Approximately 64% of the children in the behavioral intervention group met objective criteria for reliable change in IQ, whereas 14% in the eclectic comparison group did so. These results suggest that children with intellectual disability may profit from behavioral intervention typically provided for children with autism