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Lexical retrieval in spelling

Ward, Jamie (1998)
Ph.D. thesis, University of Birmingham.

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Abstract

This thesis is an investigation of how written words are processed and represented for output. A single case study of an acquired dysgraphic patient is presented who produced a serial position effect in spelling tasks characterised by an increase in error rate from word beginning of word end. This pattern is assumed to reflect a deficit in the retrieval of stored orthographic representations. It is suggested that the order of output of letters may be encoded by an ordering of activation values. The nature of the deficit in terms of distinctions between input and output and access and storage are considered. The findings are discussed in relation to an existing connectionist model of spelling which was implemented and lesioned in an attempt to reproduce certain aspects of the patients data. Furthermore, a detailed analysis of the patients spelling errors suggests that orthographic representations consist of representational units other than the single letter and whole word. Finally, the role of the semantic system in lexical retrieval was investigated with regards to the distinction between proper names and common nouns. The ability of two patients to write/read proper names semantically was studied. Differences in the representational properties of proper names may result in them being selectively spared or impaired.

Type of Work:Ph.D. thesis.
Supervisor(s):Humphreys, Glyn W.
School/Faculty:Schools (1998 to 2008) > School of Psychology
Department:Psychology
Subjects:RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
BF Psychology
P Philology. Linguistics
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:1402
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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