<unk>  results most commonly from strokes and brain unilateral injury to the right cerebral hemisphere, with rates in the critical stage of up to 80% causing visual<unk>  of the left-hand side of space.<unk>  is often produced by massive strokes in the middle cerebral artery region and is variegated, so that most sufferers do not exhibit all of the syndrome's traits. Right-sided spatial<unk>  is rare because there is redundant processing of the right space by both the left and right cerebral hemispheres, whereas in most left-dominant brains the left space is only processed by the right cerebral hemisphere. Although it most strikingly affects visual perception ('visual<unk> '),<unk>  in other forms of perception can also be found, either alone or in combination with visual<unk> . For example, a stroke affecting the right parietal lobe of the brain can lead to<unk>  for the left side of the visual field, causing a patient with<unk>  to behave as if the left side of sensory space is nonexistent (although they can still turn left). In an extreme case, a patient with<unk>  might fail to eat the food on the left half of their plate, even though they complain of being hungry. If someone with<unk>  is asked to draw a clock, their drawing might show only the numbers 12 to 6, or all 12 numbers might be on one half of the clock face with the other half distorted or blank.<unk>  patients may also ignore the contralesional side of their body; for instance, they might only shave, or apply make-up to, the non-neglected side. These patients may frequently collide with objects or structures such as door frames on the side being<unk> ed.<unk>  may also present as a delusional form, where the patient denies ownership of a limb or an entire side of the body. Since this delusion often occurs alone, without the accompaniment of other delusions, it is often labeled as a monothematic delusion.<unk>  not only affects present sensation but memory and recall perception as well. A patient suffering from<unk>  may also, when asked to recall a memory of a certain object and then draw said object, draw only half of the object. It is unclear, however, if this is due to a perceptive deficit of the memory (to the patient having lost pieces of spatial information of the memory) or whether the information within the memory is whole and intact but simply being ignored, the same way portions of a physical object in the patient's presence would be ignored. Some forms of<unk>  may also be very mild—for example, in a condition called extinction where competition from the ipsilesional stimulus impedes perception of the contralesional stimulus. These patients, when asked to fixate on the examiner's nose, can detect fingers being wiggled on the affected side. If the examiner were to wiggle his or her fingers on both the affected and unaffected sides of the patient, the patient will report seeing movement only on the ipsilesional side. Effects Though it is frequently underappreciated, unilateral<unk>  can have dramatic consequences. It has more negative effect on functional ability, as measured by the Barthel ADL index, than age, sex, power, side of stroke, balance, proprioception, cognition, and premorbid ADL status. 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.<unk>  is probably among the reasons patients with right hemisphere damage are twice as likely to fall as those with left-side brain damage. Patients with<unk>  take longer to rehabilitate and make less daily progress than other patients with similar functional status. Patients with<unk>  are also less likely to live independently than patients who have both severe aphasia and right hemiparesis.
Hemispatial neglect
Hemimotor neglect
Visuospatial dysgnosia
Integrative agnosia
Autotopagnosia
Finger agnosia
Metamorphopsia
Receptive aphasia