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Delirium is a syndrome characterized by acute change or fluctuating course of mental status, disorganized or incoherent thought, impaired attention, and altered consciousness. Neuropsychological symptoms such as hallucinations are common in delirium, but potential underlying visual disorders have not been documented previously. Now, researchers have measured the integrity of cognitive processes behind visual perception in 17 patients with delirium, 14 patients with Alzheimer disease (AD), and 18 cognitively intact subjects.
The participants completed five neuropsychological tests of visual perception (dot counting, position discrimination of dots within a square, shape detection, incomplete letters, and an object-decision task) and three mem…