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Query: UMLS:C0004352 (autism)
 32,579 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The study was designed to explore factors related to negativism in autistic children, where negativism was defined as the consistent avoidance of a correct response in a multiple choice discrimination task. A design employed in an earlier study of autistic children (Cowan, Hodinott, & Wright, 1965) was modified to allow a more detailed examination of patterning of the child's responses. A positive relationship was found between use of spoken language and successful performance of the task. However, no child was negativistic. Of the 27 children tested, 18 had a near perfect performance and 9 scored at chance level. A subsequent exact replication of the Cowan et al. method still failed to produce any negativism. A further study using a more difficult discrimination task produced a higher rate of errors but still no negativism. Possible reasons for the failure to replicate are discussed.
J Autism Child Schizophr 1977 Mar
PMID:Compliance and resistance in autistic children. 57 4

Research suggests that impairments in executive functions play a role in the cognitive deficit in autism. Possible autism-specific impairments include an inability to engage in goal-directed behaviors and adjust behaviors given environmental demands. What has been described as executive functions is based largely on observations of performance in the laboratory rather than in natural settings. An ecological method first described by Barker and Wright and adapted by Scott was used to assess the patterns of goal-directed behaviors of eight children with autism and eight chronological and mental age comparable children with Down syndrome. Quantitative and qualitative features of naturalistic behaviors were collected, and coded using previously described categories of children's behavior. Results indicated that children with autism exhibited shorter and less overlapping goal-directed behaviors. These data suggest a cognitive difference rather than developmental delay, and lend support for impaired executive functions in autism. Practical implications for educators and caregivers are discussed.
Autism 2002 Dec
PMID:Executive functions and the natural habitat behaviors of children with autism. 1254 Jan 28

Caregivers of children with autism spectrum disorder are vulnerable to overstated benefits of interventions, and such overstatements are common with interventions involving animals. This response to Wright, Hall, Hames, Hardmin, Mills, the Paws Team, and Mills' (2015) article, "Acquiring a Pet Dog Significantly Reduces Stress of Primary Careers for Children with Autism Spectrum Disorder: A Prospective Case Control Study," details why that study's conclusions are premature. Specific limitations of the study are detailed, including overstatements of the supportive literature, problems with the design, and mismatch between the findings and conclusions. The purpose is not to challenge the benefits of pet ownership, but to point out that those benefits have not yet been established.
J Autism Dev Disord 2016 Jan
PMID:Additional Evidence is Needed to Recommend Acquiring a Dog to Families of Children with Autism Spectrum Disorder: A Response to Wright and Colleagues. 2634 Sep 55

More than a century ago, Wilhelm Johannsen proposed the terms "genotype" and "phenotype" to study heredity. Much of what we know about genetics and behavior has evolved since then, especially how causality from genotypes can be inferred from observational studies of phenotypes. Unfortunately, there are genotypes that produce complex clinical-behavioral phenotypes-pleiotropy. In addition, there are often many genotypes that produce the same phenotype, adding a layer of complexity in establishing valid genotype-phenotype relationships. Unlike the relative simplicity of some phenotypes, behavioral phenotypes, especially those characteristics considered aberrant, are multidimensional and often not easily defined operationally. An alternate approach which attempts to identify less evident manifestations below the level of the phenotype but along the pathway to the prospective genotype-endophenotypes-could prove useful in detecting genes that generate these markers. However, operational definitions of intermediate phenotypes vary, less overt neurobiological expressions for some disorders-autism-have not been found, and studies of endophenotypes associated with schizophrenia have been not been very successful. Another approach, suggested by Sewall Wright, uses path analysis to identify causal variables that produce phenotypes. Innovative models of causality have been developed recently by genetic epidemiologists that incorporate Mendel's second law, and Mendelian randomization has been successful in identifying genotypes associated with some diseases, for example, diabetes and cancer. Regrettably, shortcomings regarding genetic markers associated with intermediate phenotypes have been found, although there are statistical procedures to remedy matters. As in any science, genetic researchers need to consider carefully the models of causality they choose.
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PMID:Whither the genotype-phenotype relationship? An historical and methodological appraisal. 2883 62