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In page Causes of mental disorders:

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Mental characteristics of individuals, as assessed by both neurological and psychological studies, have been linked to the development and maintenance of mental disorders. This includes cognitive or neurocognitive factors, such as the way a person perceives, thinks, or feels about certain things; or an individual's overall personality, temperament, or coping style or the extent of protective factors or "positive illusions" such as optimism, personal control and a sense of meaning.[citation needed]