title: Is weakened circadian rhythmicity a characteristic of neuroticism?
abstract: The aim of this study was to undertake a preliminary investigation of the novel hypothesis that weakened circadian rhythmicity is an aspect of the psychobiology of neuroticism (N). Two groups of subjects [young healthy females categorised as High N (N=8) or Low N (N=6)] were compared in terms of a classical circadian variable (the unmasked rhythm in core body temperature), and a validated psychological variable (diurnal rhythm in Positive Affect), under two experimental protocols (constant routine and ambulatory). As predicted, model-fitting analyses found that the High N group was characterised by attenuated circadian amplitudes in unmasked body temperature under both protocols. Also as hypothesised Positive Affect exhibited a circadian rhythm that was only significant in the Low N group. A stronger synchronisation between the biological and psychological rhythms was also observed in the Low N group. Results are discussed in terms of the implications of a possible circadian diathesis for disorders and complaints across the neurotic spectrum.
authors.affiliation: Department of Psychology, University of Melbourne, Victoria 3052, Parkville, Australia. g.murray@psych.unimelb.edu
authors.forename: Greg
authors.initials: G
authors.lastname: Murray
authors.forename: Nicholas B
authors.initials: NB
authors.lastname: Allen
authors.forename: John
authors.initials: J
authors.lastname: Trinder
authors.forename: Helen
authors.initials: H
authors.lastname: Burgess
mesh_terms: D000293:Adolescent; D000328:Adult; D000339:Affect; D001831:Body Temperature; D002940:Circadian Rhythm; D004198:Disease Susceptibility; D005260:Female; D006801:Humans; D009497:Neurotic Disorders / Q000503:physiopathology*