Reading and visual word recognition ability in Semantic Dementia is not predicted by semantic performance

PLAYFOOT, David, BILLINGTON, Jac and TREE, Jeremy J. (2018). Reading and visual word recognition ability in Semantic Dementia is not predicted by semantic performance. Neuropsychologia, 111, 292-306.

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Abstract

This paper describes longitudinal testing of two Semantic Dementia (SD) cases. It is common for patients with SD to present with deficits in reading aloud irregular words (i.e. surface dyslexia), and in lexical decision. Theorists from the connectionist tradition (e.g. Woollams, et al, 2007) argue that in SD cases with concurrent surface dyslexia, the deterioration of irregular word reading and recognition performance is related to the extent of the deterioration of the semantic system. The Dual Route Cascaded model (DRC; Coltheart et al, 2001) makes no such prediction. We examined this issue using a battery of cognitive tests and two structural scans undertaken at different points in each cases time course. Across both cases, our behavioural testing found little evidence of a key putative link between semantic impairment and the decline of irregular word reading or lexical decision. In addition, our neuroimaging analyses suggested that it may be the emergence of atrophy to key neural regions both inside and outside the anterior temporal lobes that may best capture the emergence of impairments of irregular word reading, and implicated inferior temporal cortex in surface dyslexia.

Item Type:	Article
Uncontrolled Keywords:	Semantic Dementia, Surface Dyslexia; Reading; Lexical Decision; Semantics
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Psychology Research Group
Departments - Does NOT include content added after October 2018:	Faculty of Social Sciences and Humanities > Department of Psychology, Sociology and Politics
Identification Number:	https://doi.org/10.1016/j.neuropsychologia.2018.02.011
Page Range:	292-306
Depositing User:	David Playfoot
Date Deposited:	09 Feb 2018 09:11
Last Modified:	17 Mar 2021 17:45
URI:	https://shura.shu.ac.uk/id/eprint/18616

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