Retinotopic modulation of space misrepresentation in unilateral neglect: evidence from quadrantanopia
نویسندگان
چکیده
منابع مشابه
Retinotopic modulation of space misrepresentation in unilateral neglect: evidence from quadrantanopia.
A patient with right sided brain damage suffered contralesional neglect, inferior quadrantanopia (with 0 degrees sparing in the left eye and 13 degrees sparing in the right), and a visual field restriction (to 15 degrees ) in the upper contralesional quadrant of the left eye. In binocular vision, the patient showed underestimation of the horizontal size of contralesional line segments unless cu...
متن کاملHorizontal space misrepresentation in unilateral brain damage. II. Eye-head centered modulation of visual misrepresentation in hemianopia without neglect.
We used a visual distance reproduction task (endpoint task) to evaluate horizontal space representation in two left brain damaged (LBD) and three right brain damaged (RBD) patients with contralateral homonymous hemianopia and no neglect. All patients were examined in the chronic phase of the stroke and were aware of their visual field defect. Along with contralesional deviation in the line bise...
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Patients with unilateral neglect can misperceive horizontal distances in the contralesional space as being shorter than equivalent ipsilesional ones. We evaluated the visual and motor-proprioceptive components of space misrepresentation through a distance reproduction task performed both with and without visual guidance. Four groups of right brain damaged patients (neglect with hemianopia (N+H+...
متن کاملSpace representation in unilateral spatial neglect.
Patients with unilateral brain lesions were given a task requiring exploration of space with the hand in order to assess the visual dependency of unilateral spatial neglect. The task was carried out both without visual control and under visual control. Performances were compared with that of normal subjects. Results were :(1) patients with right brain damage with no visual field defect demonstr...
متن کاملRetinotopic mapping reveals extrastriate cortical basis of homonymous quadrantanopia.
It has been conventionally assumed that cortically based quadrantic visual field deficits (homonymous quadrantanopias) are caused by lesions in striate cortex (V1), extending precisely to the horizontal meridian representation. A more recent model, supported by anatomic MRI evidence, consists of an exclusively extrastriate cortical basis (e.g. V2, V3, VP, V4v). Employing fMRI, we sought to dist...
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ژورنال
عنوان ژورنال: Journal of Neurology, Neurosurgery & Psychiatry
سال: 2003
ISSN: 0022-3050
DOI: 10.1136/jnnp.74.1.116