I think individual self-knowledge is often flawed. There are many strange, damaged, malfunctioning, drunk, medicated, hallucinating, meditating, dreaming and variously other disturbed minds, which have objectively flawed impressions of themselves and their surroundings.
Their doctors, or even a casual observer, will have much more concrete objective knowledge of their state of mind than the subjects themselves.
Their doctors, or even a casual observer, will have much more concrete objective knowledge of their state of mind than the subjects themselves.