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Chronotypes

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Encyclopedia of Personality and Individual Differences
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Introduction

The circadian timing of physiological functions and daily activities vary among individuals. Based on the peak times of physiological functions, such as blood pressure, hormone secretion, core body temperature, as well as preferences in the timing of sleep, humans can be categorized into three chronotypes: earlier-timed Morning-types, later-timed Evening-types, or between-timed Intermediate-types (Duffy et al. 2001). It has been estimated that genetic differences account for approximately 50% of the interindividual variance seen in adult circadian behavior (Koskenvuo et al. 2007). Chronotype is relative unchangeable once a person reaches adulthood. Slight shifts in circadian timing are however still possible after puberty, but shifting from a purely Morning-type to a purely Evening-type or vice versa is not common among adults. Especially, tendency toward morningness seems to increase during aging. One explanation for this, besides the possible change in the innate clock,...

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Correspondence to Ilona Merikanto .

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Merikanto, I. (2017). Chronotypes. In: Zeigler-Hill, V., Shackelford, T. (eds) Encyclopedia of Personality and Individual Differences. Springer, Cham. https://doi.org/10.1007/978-3-319-28099-8_738-1

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  • DOI: https://doi.org/10.1007/978-3-319-28099-8_738-1

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