To see better to the left when looking more to the right: Effects of gaze direction and frames of spatial coordinates in unilateral neglect

Autor: Nathalie Valenza, Eugène Mayer, Stephen Perrig, Theodor Landis, Patrik Vuilleumier
Rok vydání: 1999
Předmět:
Male
medicine.medical_specialty
genetic structures
Hemiplegia
Fixation
Ocular
Neuropsychological Tests
Audiology
Dominance
Cerebral/physiology
Hemiplegia/ diagnosis/physiopathology/psychology
Quadrant (plane geometry)
Position (vector)
Spatial reference system
Orientation
medicine
Humans
Attention
Attention/physiology
Dominance
Cerebral
Aged
Visual Fields/physiology
Brain Mapping
Communication
Brain/physiopathology
business.industry
General Neuroscience
Brain
Hemianopsia/ diagnosis/physiopathology/psychology
Middle Aged
medicine.disease
Fixation
Ocular/physiology
Gaze
eye diseases
ddc:616.8
Visual field
Psychiatry and Mental health
Clinical Psychology
Unilateral neglect
Extinction (neurology)
Hemianopsia
Female
Neurology (clinical)
Visual Fields
business
Psychology
Orientation/physiology
Mental image
Zdroj: Journal of the International Neuropsychological Society, Vol. 5, No 1 (1999) pp. 75-82
ISSN: 1469-7661
1355-6177
DOI: 10.1017/s1355617799511107
Popis: Unilateral spatial neglect entails a failure to detect or respond to stimuli in the space opposite to a brain lesion. However, the contralesional hemispace can be determined by different frames of spatial coordinates, such as eyes-, head-, body-, or environment-centered coordinates. We observed 2 patients with a right hemisphere stroke whose left spatial neglect was modulated by distinct coordinates systems depending on the task. Four tasks were given in different conditions of central gaze and either the eyes or the head rotated 30° to the right or 30° to the left. While the 2 patients had a retinotopic defect in 1 visual field quadrant that remained the same irrespective of gaze direction (upper or lower quadrant in 1 case each), the other quadranopic field defect improved with eyes rotation to the right but not with head rotation, suggesting a head-centered spatiotopic deficit. Performance on line bisection was influenced both by eyes and head rotation, as well as by the position of the lines with respect to the trunk midline, suggesting the involvement of both head-centered and body-centered coordinates. Visual imagery and auditory extinction were not modified by changing the eyes or head position. These findings suggest that distinct spatial coordinates are brought into play depending on the tasks demands. (JINS, 1999, 5, 75–82.)
Databáze: OpenAIRE
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