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Title: Evaluation of dichotic listening as a measure of the organisation of linguistic and reading skills
Author: Terrell, C. D.
Awarding Body: Birkbeck (University of London)
Current Institution: Birkbeck (University of London)
Date of Award: 1980
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The REA (right ear advantage) normally obtained following free recall of strings of dichotic stimuli has frequently been used to indicate the degree and/or the direction of hemispheric lateralisation for language. Examination of subjects free recall responses in this series of 9 experiments suggests that a substantial contribution to the variance that makes up REA comes from subject response factors. It is suggested that the REA obtained .under free recall conditions is a considerably less accurate measure of ear/hemisphere asymmetries than previous research has assumed. Subject response factors appeared to be reduced when ordered recall was used. A review of the literature shows that control for order of report is rarely exercised in dichotic listening experiments and that free recall is almost always used. Proportions of left and right handed adult subjects who showed a REA were similar to those predicted by the Wada test only when the relatively difficult task of 4 pairs of stimuli and ORDERED RECALL was used. Further experiments suggested that subject response factors appeared to exert a greater influence on REA when children were used as subjects than when adults were used and that they were considerably more difficult to control when children were used as subjects. Abstract Page Ie Earlier studies have suggested that dyslexics may show a developmental lag in language lateralisation compared to good readers and that it may be possible to differentiate between such groups in terms of REA. Examination of the responses of dyslexic and good readers did reveal differences in performance, but these groups did not differ in REA. Dyslexics showed poorer performance on total item recall and in addition they showed what appeared to be a marked deficiency in their ability to report 'sequences' under the ordered recall conditions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Linguistics Linguistics