a spatial and attentional disorder resulting from bilateral lesions in the parieto-occipital regions of the brain. It consists of inability to visually guide the hand to an object (optic ataxia), inability to change visual gaze (oculomotor apraxia), and inability to recognize multiple stimuli in a scene and understand their nature as a whole (simultanagnosia; see visual agnosia). [first described in 1909 by Rudolf Bálint (1874–1929), Hungarian physician]