منابع مشابه
Visual Hemifield Loss in Thalamic Hematoma
A 45 year old hypertensive patient presented to the emergency medical room (EMR) with sudden onset of severe headache, episode of vomiting, visual loss and confusion. A C.T scan and MRI brain was done revealing a large hematoma in the region of posterior part of left thalamus. The patient was disoriented in time, place and had right visual field hemianopia. The headache and higher functions bec...
متن کاملBrain representation of hemifield stimulation in poststroke visual field defects.
BACKGROUND AND PURPOSE Plasticity in extended, parallel, or reciprocal operating networks is well recognized. Changes in neuronal activity after lesions to distinct localized structures, such as the primary visual cortex, are less well characterized. We investigated the cortical reorganization in patients with poststroke visual field defects using blood oxygen level-dependent functional MRI. ...
متن کاملContralateral visual hemifield representations in the human pulvinar nucleus.
The pulvinar is a major nucleus of the thalamus. Macaque pulvinar includes two subregions that are connected to the visual cortex and are retinotopically organized, but the organizing principles of the visual portions of the human pulvinar are unknown. We employed two tasks to address the question of whether human pulvinar exhibits spatial organization using event-related functional magnetic re...
متن کاملDevelopment and aging of visual hemifield asymmetries in contrast sensitivity.
The relation of development and aging with models of visual anisotropies and their influence on low-level visual processing remain to be established. Our main goal was to explore visual performance asymmetries in development and normal aging using low-level contrast sensitivity behavioral tasks [probing two distinct spatiotemporal frequency channels, (a) intermediate spatial and null temporal f...
متن کاملMovement in the normal visual hemifield induces a percept in the 'blind' hemifield of a human hemianope.
We have investigated visual responses to moving stimuli presented to the normal hemifield of a hemianope, GY, who exhibits residual visual function in his right, 'blind' hemifield. Preliminary experiments established that his perception of moving stimuli localized in his 'blind' hemifield is retained when a similar stimulus is presented simultaneously in the normal hemifield. In response to a g...
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ژورنال
عنوان ژورنال: Annals Of Neurosciences
سال: 2011
ISSN: 0972-7531,0976-3260
DOI: 10.5214/ans.0972.7531.111812