Which condition features cortical damage without brainstem involvement, with quadriparesis and incontinence and no voluntary movement persisting after one month?

• A. Persistent vegetative state
• B. Agnosia
• C. Palinopsia
• D. Anton syndrome

Answer: (A)

This scenario illustrates wakefulness without awareness due to extensive cortical damage while brainstem function remains intact. When the cortex is severely injured, a person can be physically aroused—eyes open, reflexive movements—but there is no evidence of conscious perception or purposeful interaction with the environment. The presence of quadriparesis and incontinence fits with widespread cortical/subcortical injury that disrupts voluntary control, yet leaves brainstem systems that generate arousal functioning intact. If there is no meaningful, purposeful response for an extended period, such as a month or longer, this pattern is characteristic of a persistent vegetative state: the patient appears awake but lacks sustained, purposeful awareness.

Understanding the other conditions helps clarify why this is the best fit here. Agnosia involves intact basic perception but impaired higher-level recognition, not a state of consciousness; palinopsia is a perceptual phenomenon involving persistence of visual images, not a disorder of consciousness; Anton syndrome is cortical blindness with denial of blindness, again not describing a global loss of awareness with preserved arousal.