Cognitive deficits resulting from stroke include perceptual disorders, aphasia, dementia, and problems with attention and memory. Stroke survivors may be unaware of their own disabilities, a condition called anosognosia. In a condition called hemispatial neglect, the affected person is unable to attend to anything on the side of space opposite to the damaged hemisphere. Cognitive and psychological outcome after stroke can be affected by the age at which the stroke happened, pre-stroke baseline intellectual functioning, psychiatric history and whether there is pre-existing brain pathology.