It's very common in paranoid schizophrenics to have areas of significant impairment and islands where cognitive skills are preserved,

This is important, because mild cognitive impairment often precedes dementia.

At least half of the patients had a cognitive impairment when they entered rehabilitation.

With or without cognitive impairment, patients improved in stroke rehabilitation, and they improved at a similar rate, regardless of whether cognitive impairment was present, at least as measured by the Mini-Mental State Exam.

I feel we are all islands - in a common sea.

Head injuries are a significant risk to accelerated cognitive decline.