As Lisa Bartolotti notes, some psychological disorders make people less prone to cognitive biases:
Madness and irrationality may seem inextricably related. “You are crazy!” we say, when someone tells us about their risk-taking behavior or their self-defeating actions. The International Classification of Diseases (ICD-10) and the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) describe people with depression, autism, schizophrenia, dementia, and personality disorders as people who infringe norms of rationality. But not all people diagnosed with a mental disorder behave irrationally, and not all people who behave irrationally are diagnosed with a mental disorder.
There is evidence that people with a diagnosis of schizophrenia, depression, or autism are, in some contexts, more epistemically rational, that is, more responsive to evidence and more likely to form true beliefs, than people without any psychiatric diagnosis. People make more accurate predictions when they are depressed, because the statistically normal way to make predictions is characterized by excessive optimism. People with autism score higher in social interaction games (such as Prisoner’s Dilemma) and are more logically consistent than control participants when making decisions involving possible financial gain, by not responding to emotional contextual cues in the same way as controls. People with schizophrenia are also less vulnerable to a statistically normal but irrational tendency to gamble when faced with a certain loss.
The Dish 