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Orienting of attention in left unilateral neglect

Bartolomeo, P. and Chokron, S. (2002) Orienting of attention in left unilateral neglect. [Journal (Paginated)]

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Abstract

After right posterior brain damage, patients may ignore events occurring on their left, a condition known as unilateral neglect. Although deficits at different levels of impairment may be at work in different patients, the frequency and severity of attentional problems in neglect patients have been repeatedly underlined. Recent advances in the knowledge of the mechanisms of spatial attention in normals may help characterizing these deficits. The present review focuses on studies exploring several aspect of attentional processing in unilateral neglect, with particular reference to the dichotomy between 'exogenous', or stimulus-related, and 'endogenous', or strategy-driven, orienting of attention. A large amount of neuropsychological evidence suggests that a basic mechanism leading to left neglect behavior is an impaired exogenous orienting toward left-sided targets. In contrast, endogenous processes seem to be relatively preserved, if slowed, in left unilateral neglect. Other component deficits, such as a general slowing of the operations of spatial attention, might contribute to neglect behavior. These results are presented and discussed, and their implications for hemispheric specialization in attentional orienting and for the mechanisms of visual consciousness are explored.

Item Type:Journal (Paginated)
Keywords:brain damage, attention, exogenous and endogenous orienting, neglect, sensory extinction
Subjects:Neuroscience > Neuropsychology
Neuroscience > Behavioral Neuroscience
ID Code:3400
Deposited By: Bartolomeo, Paolo
Deposited On:20 Jan 2004
Last Modified:11 Mar 2011 08:55

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