Which syndrome arises from bilateral parieto-occipital lesions and includes ocular apraxia, optic ataxia, and simultanagnosia?

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Multiple Choice

Which syndrome arises from bilateral parieto-occipital lesions and includes ocular apraxia, optic ataxia, and simultanagnosia?

Balint syndrome results from bilateral parieto-occipital damage and reflects disruption of the dorsal visual stream, the pathway that guides spatial attention and action. The three features—ocular apraxia, optic ataxia, and simultanagnosia—together define this syndrome. Ocular apraxia means patients have difficulty voluntarily initiating and directing eye movements, so scanning the visual world is disorganized. Optic ataxia is the trouble using sight to guide hand movements, leading to misreaching or misgrasping objects even when they can see them. Simultanagnosia is the inability to perceive more than one object at a time or to grasp the overall scene, despite intact basic visual processing. This specific triad is characteristic of Balint syndrome, typically arising from bilateral posterior brain injury (parietal-occipital regions). By contrast, agnosia involves object recognition deficits without this particular pattern of eye movement and visuomotor coordination problems, prosopagnosia is a face-recognition defect, and palinopsia is persistence of visual images after the stimulus, none of which fit the full triad.

Balint syndrome results from bilateral parieto-occipital damage and reflects disruption of the dorsal visual stream, the pathway that guides spatial attention and action. The three features—ocular apraxia, optic ataxia, and simultanagnosia—together define this syndrome. Ocular apraxia means patients have difficulty voluntarily initiating and directing eye movements, so scanning the visual world is disorganized. Optic ataxia is the trouble using sight to guide hand movements, leading to misreaching or misgrasping objects even when they can see them. Simultanagnosia is the inability to perceive more than one object at a time or to grasp the overall scene, despite intact basic visual processing. This specific triad is characteristic of Balint syndrome, typically arising from bilateral posterior brain injury (parietal-occipital regions). By contrast, agnosia involves object recognition deficits without this particular pattern of eye movement and visuomotor coordination problems, prosopagnosia is a face-recognition defect, and palinopsia is persistence of visual images after the stimulus, none of which fit the full triad.

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