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At least 1,063 records · Page 59Linked to original sources
PubMed1998

Cognitive substrates of thought disorder, I: the semantic system.

OBJECTIVE: Few studies have explored in detail the relation of cognitive deficits in attention, working memory, and semantics to thought disorder. The authors sought to determine whether thought disorder resides in the semantic system or elsewhere. METHOD: Twenty-three normal comparison subjects and 23 patients with schizophrenia participated in the study. All subjects received tests of executive function and working memory, including the Wisconsin Card Sorting Test and the Letter-Number Span test; a test of deployment of attentional resources; and tests of semantic processing and language comprehension, including the Peabody Picture Vocabulary Test, the Speed and Capacity of Language-Processing Test, the Boston Naming Test, and tests of semantic verbal fluency and phonologic verbal fluency, from which was derived a difference score. All patients were also administered the Scale for the Assessment of Thought, Language, and Communication to assess thought disorder. RESULTS: The normal subjects were compared with the schizophrenic patients who were rated as having mild thought disorder (N=13) or moderate to severe thought disorder (N=10). While differences between the schizophrenic subgroups and the comparison subjects were observed on nearly all tests, a large difference in effect size between the two schizophrenic subgroups was apparent only in the verbal fluency difference score. In a series of multiple regression analyses, two variables made significant contributions to the prediction of positive thought disorder: the verbal fluency difference score and the Peabody Picture Vocabulary Test score. CONCLUSIONS: These results suggest that clinically rated thought disorder is associated with and may result from semantic processing abnormalities. In particular, patients with more severe thought disorder may have difficulty accessing semantic items because of disorganization of the semantic systems and, to a more limited degree, may also lack a semantic or conceptual knowledge base.

Adult↗
PubMed2000

Two-year outcome of preschool children with autism or Asperger's syndrome.

OBJECTIVE: DSM-IV specifies that Asperger's disorder is a type of pervasive developmental disorder without clinically significant cognitive or language delay. There are no data, however, on the outcome of children with Asperger's disorder or on whether their outcome differs from that of children with autism. The objectives of this study were to compare the outcome of groups of children with these disorders over a period of 2 years on variables independent of the defining criteria and to identify variables that might account for these differences. METHOD: All children 4-6 years of age who came for assessment or were currently in treatment at a pervasive developmental disorder service of one of several centers in a large geographic region were identified. Children who received a diagnosis of autism (N=46) or Asperger's syndrome (N=20) on the basis of a diagnostic interview and had an IQ in the nonretarded range were given a battery of cognitive, language, and behavioral tests. Families were contacted roughly 2 years after the date of their enrollment in the study, and many of the tests were readministered. RESULTS: Children with Asperger's syndrome had better social skills and fewer autistic symptoms 2 years after study enrollment than the children with autism. The differences in outcome could not be explained by initial differences in IQ and language abilities. Children with autism who had developed verbal fluency at follow-up were very similar to the children with Asperger's syndrome at study enrollment. CONCLUSIONS: Although the exact mechanism for the differences in outcome remain to be determined, it appears that Asperger's disorder and autism represent parallel but potentially overlapping developmental trajectories.

Asperger Syndrome↗
PubMed2001

Instructional manipulations and age differences in memory: now you see them, now you don't.

The instructions for most explicit memory tests use language that emphasizes the memorial component of the task. This language may put older adults at a disadvantage relative to younger adults because older adults believe that their memories have deteriorated. Consequently, typical explicit memory tests may overestimate age-related decline in cognitive performance. In 2 experiments, older and younger adults performed a memory test on newly learned trivia. In both experiments, age differences were obtained when the instructions emphasized the memory component of the task (memory emphasis) but not when the instructions did not emphasize memory (memory neutral). These findings suggest that aspects of the testing situation. such as experimental instructions, may exaggerate age differences in memory performance and need to be considered when designing studies investigating age differences in memory.

Adolescent↗
PubMed1989

Linguistic and nonlinguistic impairments in writing: a comparison of patients with focal and multifocal CNS disorders.

The hypothesis that the language disorder in Alzheimer's disease (AD) depends on degenerative brain changes in classical left-hemisphere language zones was tested by comparing the written language performances of a group of AD patients with mild-moderate dementia and left-hemisphere stroke patients with equally severe naming and auditory comprehension deficits who were in varying stages of recovery from Wernicke's aphasia. The results indicated significant qualitative group differences in performances between tasks and in errors within tasks. The findings are consistent with hypothesized disruption of more diffusely organized neurolinguistic systems in AD. The hypothesis that the language disorder in AD represents an exaggeration of the pattern of language change in normal aging was also examined by comparing the performances of AD patients to the changes that occur with very advanced normal aging. The data indicate convergence between AD and very elderly healthy subjects in some aspects of written language production.

Aged↗
PubMed1984

Procedural influences on auditory comprehension: a second look at the Revised Token Test.

The purpose of this report is to demonstrate how methodologic procedures used in the standardization of certain subtests of the Revised Token Test ( RTT ) ( McNeil and Prescott , 1978) may have affected the nature of the data collected and, subsequently the interpretation of auditory comprehension abilities shown by clinical populations tested with the RTT .

Adult↗
PubMed1983

Grammatical comprehension assessment: the picture avoidance strategy.

This study investigated children's picture avoidance responses on a paired sentences, grammatical comprehension test. Such responses involved the nonselection of a particular referent picture for a stimulus sentence when the picture had been selected as a referent for a previous stimulus sentence. Forty-four children between three and seven years of age were administered a version of the Receptive subtest of the Northwestern Syntax Screening Test. Half of the sample was administered the test under its standardized "single pass-paired sentences" procedure. The remaining children were administered the test under a "double pass-paired sentences" procedure (i.e., a procedure similar to that employed on the Miller-Yoder Test of Grammatical Comprehension). As predicted, the single pass-paired sentences version of the test elicited significantly more picture avoidance responses from the children. The consequence of children's differential picture avoidance responses on a single pass-paired sentences test is discussed with respect to different scoring criteria.

Child↗