The Right-Hemisphere and Valence Hypotheses: Could …
Two groups of children with contrasting types of developmental language disorder (phonologic-syntactic and semantic-pragmatic) were compared with a group of children with high-level autism and with a control group of normal children on a broad battery of neuropsychological tests, known to be sensitive to left-right hemisphere damage. Significant differences found between the groups suggest contrasting forms of hemispheric dysfunction.
Right hemisphere or valence hypothesis, or both
AB - We studied writing abilities in a strongly right-handed man following a massive stroke that resulted in virtually complete destruction of the language-dominant left hemisphere. Writing was characterized by sensitivity to lexical-semantic variables (i.e., word frequency, imageability, and part of speech), semantic errors in writing to dictation and written naming, total inability to use the nonlexical phonological spelling route, and agrammatism in spontaneous writing. The reliance on a lexical-semantic strategy in spelling, semantic errors, and impaired phonology and syntax were all highly consistent with the general characteristics of right hemisphere language, as revealed by studies of split-brain patients and adults with dominant hemispherectomy. In addition, this pattern of writing closely resembled the syndrome of deep agraphia. These observations provide strong support for the hypothesis that deep agraphia reflects right hemisphere writing.
The most direct test of the hypotheses (which overcomes the disadvantage that comparisons within tests are not independent) was to compute specific contrasts (again using randomisation tests) between the S and A groups combined, on the one hand, and the P and C groups combined, on the other. The results, giving one- and two-sided values, are presented in Table VI. For each test in the battery, only one contrast was being calculated. so 0.05 could be used as the critical level for significance. In all of the one-tailed comparisons. and all but one of the two-tailed, the combined P and C groups scored significantly better than the combined S and A groups.
Study shows dominant Left-Brain vs
There was also support for hypothesis B, that semantic-pragmatic language disorder forms part of the autistic spectrum of disorders, in so far as there were no significant differences between groups S and A on either the right or left hemisphere test batteries. There was clear close coincidence between groups S and A in the right hemisphere tests battery profile.
There are three accounts of how lateralization ..
The results support the view that right hemisphere dysfunction (or bilateral dysfunction) is implicated in developmental semantic-pragmatic language disorder and in high-level autism. The right hemisphere test battery showed a consistent pattern of groups S and A scoring significantly lower than groups P and C.
Another hypothesis says that the right-hemisphere ..
Hypothesis A, the hypothesis of contrasting hemispheric function between the two groups with language disorder, group P and group S, was largely supported.
Left Brain vs. Right: It's a Myth, Research Finds
(Right side neglect occurs in approximately twenty percent of patients with left hemisphere damage.) It is also less severe and usually of shorter duration than left side neglect.
Right hemisphere lateralization for emotion in the …
Each subject was tested individually by the first author in their own school or home. A battery of tests was selected with the aim of comparing strengths and weaknesses of the groups, seeking signs of contrasting hemispheric dysfunction. Some of the tests selected had been designed for children and had norms: others were adapted from those known to be reliable in indicating hemispheric differences in adult subjects with brain lesions. The contents of the test battery are listed in Table II and explained in the Appendix.