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Pathologies of hyperfamiliarity in dreams, delusions and déjà vu
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Mo' kerotonin, mo' serotonin!
Well, I'll take theirs:"The ability to challenge and revise thoughts prompted by anomalous experiences depends on activity in right dorsolateral prefrontal circuitry. When activity in those circuits is absent or compromised subjects are less likely to make this kind of correction. This appears to be the cause of some delusions of misidentification consequent on experiences of hyperfamiliarity for faces. Comparing the way the mind responds to the experience of hyperfamiliarity in different conditions such as delusions, dreams, pathological and non-pathological déjà vu, provides a way to understand claims that delusions and dreams are both states characterized by deficient “reality testing.”"
I will note even if you don't know a lot about neurology, I think you can get a lot of this, as a bit more philosophy of mind than hardcore neurology.
An interesting overview of some of the current thoughts (from a more psychology and neurological standpoint) on reality testing and the nature of dreams vs. delusions.