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As the study of constructional apraxia impairments narrows, research is concentrating on analyzing drawing abilities. Drawing abilities may be decomposed into three steps: visual perception, visual imagery, and graphic production. According to the two-streams hypothesis, as information exits the occipital lobe it follows two pathways.
Its presence within the first 10 days of a stroke is a stronger predictor of poor functional recovery after one year than several other variables, including hemiparesis, hemianopsia, age, visual memory, verbal memory, and visuoconstructional ability. Neglect is probably among the reasons patients with right hemisphere damage are twice as likely ...
Simultanagnosia (or simultagnosia) is a rare neurological disorder characterized by the inability of an individual to visually perceive more than a single object at a time. . This type of visual attention problem is one of three major components (the others being optic ataxia and optic apraxia) of Bálint's syndrome, an uncommon and incompletely understood variety of severe neuropsychological ...
Anton syndrome, also known as Anton-Babinski syndrome and visual anosognosia, is a rare symptom of brain damage occurring in the occipital lobe. Those who have it are cortically blind , but affirm, often quite adamantly and in the face of clear evidence of their blindness , that they are capable of seeing.
Visual neglect (also called hemispatial neglect or unilateral spatial neglect) differs from hemianopsia in that it is an attentional deficit rather than a visual one. Unlike patients with hemianopsia who actually don't see, those with visual neglect have no trouble seeing but are impaired in attending to and processing the visual information ...
Like many people who are diagnosed with integrative agnosia, H.J.A. was diagnosed with this disease after suffering a stroke during a surgical procedure in an operating room. The patient underwent several experiments to verify the specific type of agnosia. H.J.A. showed top half visual deficits of the entire visual field in both right and left ...
On a third level, the classical notion of postural schema emerges, which draws from various sources of sensory afferences. Information from proprioceptive, tactile, visual, auditory, and vestibular systems is consolidated to construct an on-line, three-dimensional and dynamic representation of the body in space, a "somatosensory representation ...
Visual deficits, such as agnosia, prosopagnosia or cortical blindness (with bilateral infarcts) may be a product of ischemic damage to occipital lobe. Occlusions of the branches of the PCA that supply the thalamus can result in central post-stroke pain and lesions to the subthalamic branches can produce “a wide variety of deficits”. [1]