Abstract
ABSTRACTConsistently lateralized reading errors are commonly understood as side-effects of visuospatial neglect impairment. There is however a qualitative difference between systematically omitting full words presented on one side of passages (egocentric neglect dyslexia) and lateralized errors when reading single words (allocentric neglect dyslexia). This study aims to investigate the relationship between egocentric and allocentric neglect dyslexia and visuospatial neglect.1209 stroke survivors completed standardized reading and cancellation tests. Stringent criteria identified unambiguous cases of allocentric neglect dyslexia (N = 17) and egocentric neglect dyslexia (N = 35). These conditions were found to be doubly dissociated with all cases of egocentric and allocentric neglect dyslexia occurring independently. Allocentric neglect dyslexia was dissociated from both egocentric and allocentric visuospatial neglect. Additionally, two cases of allocentric neglect dyslexia which co-occurred with oppositely lateralized domain-general visuospatial neglect were identified. Conversely, all cases of egocentric neglect dyslexia were found in the presence of domain-general visuospatial neglect. These findings suggest that allocentric neglect dyslexia cannot be fully understood as a consequence of visuospatial neglect. In contrast, we found no evidence for a dissociation between egocentric neglect dyslexia and visuospatial neglect. These findings highlight the need for new, neglect dyslexia specific rehabilitation strategies to be designed and tested.
Highlights
Visuospatial neglect is a common neuropsychological syndrome characterized by a failure to attend to stimuli presented on one side of space (Halligan, Fink, Marshall, & Vallar, 2003; Parton, Malhotra, & Husain, 2004)
Egocentric and allocentric neglect dyslexia were found to be behaviorally doubly dissociated with all cases of allocentric neglect dyslexia occurring independently of egocentric neglect dyslexia
Egocentric neglect dyslexia was not found to be dissociable from domaingeneral visuospatial neglect impairment
Summary
Visuospatial neglect is a common neuropsychological syndrome characterized by a failure to attend to stimuli presented on one side of space (Halligan, Fink, Marshall, & Vallar, 2003; Parton, Malhotra, & Husain, 2004) This spatial-attentional deficit has been associated with a wide range of difficulties in activities of daily life in stroke survivors, including problems with reading books, menus, road signs, or other spatially presented written stimuli (Beschin et al, 2014; Ellis & Young, 2013; Turton et al, 2009). Patients with egocentric neglect dyslexia commit lateralized full word omissions when reading spatially presented passages of prose (Beschin et al, 2014) (see Figure 1 for an illustration of error patterns). Both egocentric and allocentric neglect dyslexia can impact either left- or rightlateralized stimuli (Vallar et al, 2010)
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