منابع مشابه
Optic ataxia: clinical-radiological correlations with the EMIscan.
After coronary by-pass surgery, a 47 year old, right-handed man developed Gerstmann's syndrome, a visual-spatial perceptual deficit, and a gross impairment of movememt under visual guidance ("optic ataxia"). Visual fields and extraocular movements were intact; he had a left hemiparesis. The EMIscan showed three lesions: a left parietal-occipital lesion; a posterior callosal lesion, and a right ...
متن کاملDelay abolishes the obstacle avoidance deficit in unilateral optic ataxia.
Optic ataxic patients have deficits in the visual control of manual reaching and grasping. It has been established previously that these deficits in target-directed behaviour improve following a delay in response. Recently it has been demonstrated that optic ataxic patients also have deficits in taking potential obstacles into account during reaching. The present study was therefore designed to...
متن کاملCrossed optic ataxia: possible role of the dorsal splenium.
An unusual combination of disconnective syndromes is reported: transcortical motor aphasia, left arm apraxia and optic ataxia. Neuropathological examination showed a left parieto-occipital and a subcortical frontal infarct and a lesion of the dorsal part of the posterior two-fifths of the callosum. The frontal lesion caused the transcortical motor aphasia and produced the left arm apraxia. Visu...
متن کاملCorrelated deficits of perception and action in optic ataxia.
Optic ataxia, following dorsal stream lesions, is characterised by impaired visuomotor guidance. Recent studies have found concurrent perceptual deficits, but it is unclear whether these are functionally related to the visuomotor symptoms. We studied the ability of a well-documented patient (IG) with bilateral optic ataxia to react to sudden target jumps by correcting ongoing reaches or by expl...
متن کاملGuidelines and quality measures for the diagnosis of optic ataxia
Since the first description of a systematic mis-reaching by Bálint in 1909, a reasonable number of patients showing a similar phenomenology, later termed optic ataxia (OA), has been described. However, there is surprising inconsistency regarding the behavioral measures that are used to detect OA in experimental and clinical reports, if the respective measures are reported at all. A typical scre...
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ژورنال
عنوان ژورنال: Cortex
سال: 2019
ISSN: 0010-9452
DOI: 10.1016/j.cortex.2019.09.004