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Selecting for extreme personality types is perilous
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EDITOR
Pit bull terriers and other hard to accommodate fighting
dogs can be bred selectively in a remarkably few generations. Across
the diversity of human individual differences, neither early evolution
nor the social norms of civilisation favoured the selection of many
people with extreme personality types. The study of Ferguson et al on
admissions to medical school found that the dimension of personality
labelled "conscientiousness" predicted better performance during
pre-registration studies.1
A degree of conscientiousness, in the right occupational context, can bring advantages to individual performance in many activities.2 However, this does not mean that the medical profession or its patients will necessarily benefit by selecting for ever more and more "conscientious" applicants.
At the extreme, this could mean more and more colleagues who exhibit either an obsessive narrowness in their worldview or a perfectionism that prevents them letting go of work in progress.
Idealising conscientiousness could make for
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