simultanagnosia simultanagnosia simultanagnosia (or simultagnosia) is a rare neurological disorder characterized by the inability of an individual to 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 impairments involving space representation (visuospatial processing). the term "simultanagnosia" was first coined in 1924 by wolpert to describe a condition where the affected individual could see individual details of a complex scene but failed to grasp the overall meaning of the image.