Visual search in patients with left visual hemineglect.
In patients with hemi-spatial neglect eye movement patterns during visual search reflect not only inattention for the contralesional hemi-field, but interacting deficits of multiple visuo-spatial and cognitive functions, even in the ipsilesional hemi-field. Evidence for these deficits is presented from the literature and from saccadic scan-path analysis during feature and conjunction search in 10 healthy subjects and in 10 patients with manifest or recovered left visual neglect due to right-hemispheric stroke. Deficits include (1) a rightward shift of spatial representation, (2) deficient spatial working memory and failure of systematic search strategies, leading to multiple re-fixations, more after frontal lesions, and (3) a reduced spotlight of attention and a deficient pop-out effect of color, more after temporo-parietal lesions.
Sprenger
A
A
Department of Neurology, Medical University, D-23538 Lübeck, Germany.
Kömpf
D
D
Heide
W
W
D000328:Adult; D000368:Aged; D003116:Color; D005133:Eye Movements / Q000502:physiology; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology; D007839:Functional Laterality; D006801:Humans; D008297:Male; D008875:Middle Aged; D010468:Perceptual Disorders / Q000523:psychology*; D010775:Photic Stimulation; D014796:Visual Perception / Q000502:physiology*