Abstract
This overview of attempts to shed light on the pathogenesis of delusions provides a sense of promise, because we are grappling with the right problems, and reasons for both optimism and skepticism. Optimism is justified because some of the approaches have yielded empirical support and can be tested profitably in research. Skepticism is warranted because we remain unclear about precisely what delusions are; and we have as yet no means of identifying them with a laboratory test. Hence, we must rely on the problematic nature of clinical observation of the inner experiences of patients to make progress. The different mechanisms proposed still require considerable testing, but scrutiny of current results suggests that anomalous experience as a stimulus for delusion formation has been better documented than proposals invoking disordered reasoning or motivational deviances. Nevertheless, no view is as yet established, and each may have some relevance to solving the delusion puzzle.
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