Simultanagnosia

Simultanagnosia is a rare neurological disorder in which a person cannot visually perceive more than one object at a time, even though they can identify individual objects or details when looking at them one by one. First described in 1924 by Wolpert, who found that affected patients could see the individual details of a complex scene but could not grasp its overall meaning, the condition is one of three core features of Balint's syndrome, alongside optic ataxia and oculomotor apraxia. It occurs in two forms: a more severe dorsal form caused by damage to both parietal-occipital regions of the brain, and a milder ventral form caused by damage to the left inferior occipito-temporal region; in both, shifting attention to a new object causes the previously seen object to seem to vanish from awareness. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/