The Psychopathology of Hannibal
Hemispatial neglect: A neurological condition characterised by reduced sensory awareness of one side of space, usually caused by a lesion to the right hemisphere of the brain. Patients with neglect do not take in information from the left side of their vision, and may be unaware of objects or even people within their personal space. Many patients are not conscious of their deficit, and deny that they have any problems with perception.
Studies have shown that suffers do have some awareness of their neglected field, as they exhibit reflex responses such as catching a ball thrown to them from their left side. However, they may not be consciously aware that they have done so. It is even possible to present suggestions in the neglected field in order to influence the thoughts or behaviour of the patient without them being aware of it.