Grey scales uncover similar attentional effects in homonymous hemianopia and visual hemi-neglect

Neuropsychologia
M L M TantW H Brouwer

Abstract

Multi-component models of visual hemi-neglect have postulated that visual hemi-neglect is characterised by various attentional deficits. A grey scales task has been developed to quantify the early, automatic, (perhaps obligatory) ipsilesional orienting of visual attention, frequently assumed as the first of these attentional deficits. Explanations for this attentional imbalance are up until now mainly formulated in terms of right hemisphere activation. This lateral attentional bias has also been demonstrated in controls, in whom it is expressed as a leftward perceptual asymmetry. We reproduced previous literature findings on a grey scales task, considering controls and neglect patients. Three patients with neglect showed an extreme ipsilesional lateral bias. This bias did not change during or after cognitive rehabilitation. Additionally, we presented this grey scale task to 32 patients with left- and right-sided homonymous hemianopia (HP). HP is the loss of sight in one visual hemi-field. The HH patients had no clinical signs of impaired lateralised attention. Results revealed that HH patients showed a similar ipsilesional bias, albeit to a lesser degree than in neglect. Left-sided HH patients presented a quantitatively similar...Continue Reading

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Citations

Apr 14, 2005·Experimental Brain Research·Catherine A Orr, Michael E R Nicholls
Apr 6, 2004·Brain Research. Cognitive Brain Research·Michael E R NichollsJohn L Bradshaw
May 28, 2005·Brain Research. Cognitive Brain Research·Michael E R NichollsJohn L Bradshaw
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Sep 18, 2015·Frontiers in Behavioral Neuroscience·Elisa PedroliGiuseppe Riva
Jun 5, 2002·Vision Research·M L M TantW H Brouwer
May 18, 2016·Neuropsychologia·Caterina BertiniElisabetta Làdavas

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