Season of Birth Variations in the Temperament and Character Inventory of Personality in a General Population

Chotai, Jayanti; Forsgren, T; Nilsson, Lars‐Göran; Adolfsson, Rolf

doi:10.1159/000054909

Cited by 74 publications

(42 citation statements)

References 55 publications

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“…The first two columns of table 3 display the results of similar analyses as above for other birth seasons. The pair of birth seasons compared in the first column (February to April vs. the remaining year), and in the second column (October to January vs. the remaining year) are the ones that have been studied in the context of season of birth associations with CSF monoamine metabolites [12], suicide methods [13,14], and personality scales [15]. Here, the birth season February to April did not show any essential association with morningness-eveningness preference.…”

Section: Resultsmentioning

confidence: 80%

“…These include season of birth variations in monoamine neurotransmitter turnover [12], in suicidal behavior [13,14], and in personality [15]. In those studies, the birth season October to January was associated, respectively, with higher cerebrospinal fluid (CSF) levels of the dopamine metabolite homovanillic acid and the serotonin metabolite 5-hydroxyindoleacetic acid, with the choice of the suicide method poisoning or petrol gases rather than hanging, and with the personality dimension of low novelty seeking among women and of low persistence among men.…”

Section: Introductionmentioning

confidence: 99%

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Further Results on the Association between Morningness-Eveningness Preference and the Season of Birth in Human Adults

2002

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Morningness-eveningness preference by the self-rated Morningness-Eveningness Questionnaire (MEQ) has earlier been shown to be associated with the subjects’ season of birth. Here, we obtain this result for a new sample of 2,125 university students and for the sample obtained by pooling the data with the earlier study, yielding totally 3,709 Italian and Spanish subjects. An nonlinear regression of MEQ as a cosine curve according to the month of birth, adjusting for age and gender, gave a maximum (morningness) around the transition between the birth months December and January, and a minimum (eveningness) around the transition between the birth months June and July. Multiple logistic regressions showed that for females as well as for males, the group born during the half-year April to September containing summer had a significantly lower proportion of morning types as compared with the group born during the half-year October to March containing winter. This was more pronounced for males. Moreover, a significantly higher proportion of morning types among females compared with males was found only in the group born during April to September, but not in the group born during October to March. There was a weak but statistically significant positive correlation between MEQ and age in the sample’s limited age range of 17–30 years. We discuss the results in terms of the mutually inhibitory systems of melatonin and dopamine, and find further support for a hypothesis that it is the variation in the length of photoperiod during the gestational or perinatal period that contributes significantly to the season of birth variation found in the morningness-eveningness preference among adults.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Further Results on the Association between Morningness-Eveningness Preference and the Season of Birth in Human Adults

2002

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“…In a recent study, individuals who reported lower parental care and higher parental intrusiveness were more likely to be higher in neuroticism, lower in conscientiousness, lower in SD and higher in HD. 129 Other examples of environmental variables that have been reported to affect personality include season of birth 130,131 and childhood sexual abuse. 132,133 A multidisciplinary approach in which geneticists and epidemiologists join a collaborative effort could uncover some of the important genetic and environmental variables and the possible gene-environment interactions.…”

Section: Multiple Testingmentioning

confidence: 99%

Genetics of personality: are we making progress?

2003

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For centuries, scientists are intrigued by the differences in personality between individuals. As early as in the ancient Greek civilization, people tried to formulate theories to systematize this diversity. With the increased interest in behavior genetics, personality was also considered a challenging phenotype. From the early start, studies suggested a heritable component in personality. After the successes of molecular genetic studies in unraveling the genetic basis of (mostly) monogenic diseases, the focus shifted towards complex traits, including psychiatric disorders. It was observed in several studies that personality measures differed between patients with psychiatric disorders and healthy controls. Therefore, normal personality was considered a viable endophenotype in the search for genes involved in psychiatric disorders such as affective disorders, ADHD and substance dependence. Genes that were to be found in studies on personality could be candidate genes for particular psychiatric disorders. In the course of time, however the study of genes for personality turned out to be at least as hard as the search for genes involved in other complex disorders. In this review, past studies, present problems and future directions concerning the study of personality genetics are discussed.

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“…Previous research has reported a statistically significant influence of season of birth on factors such as brain tumour development 1 , handedness 2 , longevity 3 , personality 4 , and schizophrenia and bipolar disorder 5 . Does season of birth also have an influence on mood?…”

Section: Introductionmentioning

confidence: 99%

Female gender but not season of birth is associated with mood seasonality in a near-equatorial Brazilian city

Milfont

Tilyard

Gouveia

et al. 2012

J. bras. psiquiatr.

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Brief communication Female gender but not season of birth is associated with mood seasonality in a near-equatorial Brazilian cityGreater mood seasonality has been observed for individuals born during spring/summer months than those born during autumn/winter months. Expanding past research to the Southern Hemisphere, in this study we examine the influence of season of birth on mood seasonality in a sample of 1,247 healthy young Brazilians. method: The Seasonal Pattern Assessment Questionnaire was used to compute a global seasonality score as a measure of mood seasonality in a cross-sectional study. results: Analysis of covariance was conducted to examine the effects of month of birth and gender on mood seasonality, with age entered as a covariate. A main effect of gender was observed, F (1, 1197) = 17.86, p < .01; partial Eta-squared = .02, with mood seasonality being higher for females (M = 8) than for males (M = 7). Contradicting previous findings, no significant main effect for month of birth was observed, F (1, 1197) = 0.65, p > .05. conclusion: The unexpected finding is tentatively explained by differences in geographic location and weather fluctuations between the sampling location in Brazil and other countries where season of birth has been found to influence mood seasonality. Additional studies with larger samples from the Southern Hemisphere are necessary to shed additional light on the possible significant influence of season of birth on mood.reSumo objetivo: Estudos realizados principalmente em países do Hemisfério Norte têm demonstrado que indivíduos nascidos durante os meses de primavera/verão tendem a apresentar maiores alterações sazonais do humor do que aqueles nascidos durante os meses de outono/inverno. Expandindo essas pesquisas para o Hemisfério Sul, o presente estudo examinou a relação entre época do nascimento e a flutuação sazonal do humor em uma amostra de 1.247 jovens brasileiros saudáveis de João Pessoa, Paraíba. método: Uma versão traduzida do Seasonal Pattern Assessment Questionnaire (SPAQ) foi utilizada para calcular uma pontuação

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Season of Birth Variations in the Temperament and Character Inventory of Personality in a General Population

Cited by 74 publications

References 55 publications

Further Results on the Association between Morningness-Eveningness Preference and the Season of Birth in Human Adults

Further Results on the Association between Morningness-Eveningness Preference and the Season of Birth in Human Adults

Genetics of personality: are we making progress?

Female gender but not season of birth is associated with mood seasonality in a near-equatorial Brazilian city

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