simultanagnosia
Pronunciation: sim-ul-tan-ag-NO-zee-ah
Inability to perceive multiple objects or elements of a visual scene simultaneously despite normal acuity for individual items.
Full Definition
Simultanagnosia is a visual-cognitive disorder characterized by the inability to perceive or attend to multiple visual elements simultaneously, despite preserved ability to recognize individual objects when presented in isolation. This condition results in a severely constricted visual attention span, where patients can only focus on one object or detail at a time, missing the overall gestalt or global organization of complex visual scenes. Simultanagnosia is a core feature of Balint's syndrome and typically results from bilateral parietal-occipital lesions. Patients may describe seeing individual trees but not the forest, or single letters but not whole words. This deficit significantly impacts reading, navigation, and complex visual tasks. Assessment involves presenting complex visual arrays and observing whether patients can report multiple elements simultaneously.
Usage
Usage note: Variant spelling 'simultagnosia' is also acceptable; ensure distinction from visual field defects.
In Context
- "The patient's simultanagnosia was evident when she could identify individual objects in the room but failed to comprehend the overall spatial arrangement." — Balint's syndrome evaluation
- "Simultanagnosia severely impacted reading comprehension, as the patient could recognize individual letters but not perceive whole words." — Visual-cognitive assessment report