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There are three competing conceptions concerning the relationship between positive illusions and mental health: the 'traditional' mental health model, according to which an accurate perception of the self and the world is a cornerstone of psychological well-adjustment; Taylor and Brown's Social Psychological Model on mental health, which assumes that positive illusions promote good mental health; and Baumeister's Optimal Margin Theory, which states that too much accuracy is harmful to mental health, as are exaggerated illusions. These three models were evaluated in the elderly (n = 857 retirees ages 60-95) using the youthful bias, which is the illusion of being younger than one's real age. As a whole, the Social Psychological Model obtained the strongest support. Retirees who harboured an exaggerated youthful bias (more than 15 years) reported more satisfaction with leisure time, higher self-esteem, better perceived health, and less boredom proneness than those who felt as old as they were or who, except for perceived health, entertained a moderate youthful bias (between 1 and 15 years).
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PMID:Positive illusions and mental and physical health in later life. 1469 Aug 69

Psychologists have long debated the benefits and costs of self-deceptive enhancement or positive illusions. Accurate perception of reality is central to the definitions of mental health proposed by many personality and clinical psychologists, but Taylor and Brown have suggested that having positive illusions is associated with increased happiness and satisfaction with life. One explanation for the conflicting assertions is that mental health, broadly defined, includes both subjective well-being and personal growth, distinguishable factors which are differentially related to positive illusions. For this study, 81 college students completed measures of positive illusions (Balanced Inventory of Desirable Responding Self-deceptive Positivity and How I See Myself Questionnaire), subjective well-being (Satisfaction With Life Scale and Existential Anxiety Scale), and moral reasoning (Defining Issues Test) as an index of personal growth. As predicted, positive illusion composite scores were positively correlated with scores on the subjective well-being composite (r=.40) but negatively correlated with Defining Issues Test scores (r=-.25). The quadratic relationship between these measures of positive illusion and subjective well-being composites was not significant, indicating no support for an "optimal margin of illusion."
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PMID:Positive illusions: positively correlated with subjective well-being, negatively correlated with a measure of personal growth. 1679 94