Personality and Temperament

Temperament is an early developing set of characteristics related to later personality. Commonly studied dimensions of temperament include activity level, anger/frustration, behavioural inhibition/fear, effortful control and positive affect. Personality includes a range of traits, including major traits of extraversion, neuroticism and impulsivity/sensation-seeking. Different aspects of personality and temperament are related to important developmental outcomes such as behavioural problems and psychopathology. Both behavioural genetic and molecular genetic research have contributed to the understanding of major traits of temperament and personality. Behavioural genetic approaches use twin and adoption study designs to estimate genetic and environmental contributions to individual differences in traits. Most behavioural genetic studies have found substantial heritability for personality and temperament. Molecular genetic investigations focus on the effects of specific genes (primarily dopamine- and serotonin-related genes in studies of temperament and personality).

Key Concepts:

  • Rothbart's broad extraversion/surgency, negative affectivity and effortful control dimensions of temperament are related to three of the Big Five personality factors: extraversion, neuroticism and conscientiousness, respectively.
  • The results of twin and adoption studies have shown significant genetic and nonshared environmental variance in temperament and personality.
  • Contemporary researchers investigating personality and temperament from a molecular genetic standpoint typically use either candidate gene studies or genome-wide association studies (GWAS).
  • Although behavioural and molecular genetics are separate fields, most behavioural genetic researchers have begun incorporating molecular techniques into their research programs.
  • Genotype–environment interactions, genotype–environment correlations and endophenotype approaches are utilised in genetic studies of temperament and personality.
  • Candidate gene studies of dopaminergic and serotonergic genes have informed ongoing molecular genetic research in temperament and personality.
  • Increasingly, studies of other candidate genes as well as GWAS approaches are also extant in the literature.

Keywords: personality; temperament; behaviour; development; genetics

Figure 1. Mean temperament difficulties among 48-month-old children as a function of (a) dopamine D4 receptor (DRD4) gene (long versus short allele) and (b) resting frontal electroencephalogram asymmetry (left versus right) at 9 months. Reproduced with permission from Schmidt et al. (2009a). © Sage Publications.
Figure 2. Distributions of estimated novelty seeking scores by D4DR genotype. Reproduced with permission from Benjamin et al. (1996). © Nature Publishing Group.
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 Further Reading
    book Bates JE and Wachs TD (1994) Temperament: Individual Differences at the Interface of Biology and Behavior. Washington, DC: American Psychological Association Press.
    Bouchard TJ (1994) Genes, environment, and personality. Science 264: 1700–1701.
    book Gagne JR, Vendlinski MK and Goldsmith HH (2009) "The genetics of childhood temperament". In: Kim Y-K (ed.) Handbook of Behavioral Genetics. New York: Springer.
    book Halverson CF, Kohnstamm GA and Martin RP (1994) The Developing Structure of Temperament and Personality from Infancy to Adulthood. Hillsdale, NJ: Lawrence Erlbaum.
    Nigg JT and Goldsmith HH (1998) Developmental psychopathology, personality, and temperament: reflections on recent behavior genetic research. Human Biology 70: 387–412.
    book Plomin R and Caspi A (1999) "Behavioral genetics and personality". In: Pervin LE and John OP (eds) Handbook of Personality: Theory and Research, pp. 251–276. New York: Guilford Press.
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    Tellegen A, Lykken D, Bouchard TJ et al. (1988) Personality similarity in twins reared apart and together. Journal of Personality and Social Psychology 54: 1031–1039.
    book Thomas A and Chess S (1977) Temperament and Development. New York: Brunner/Mazel.
 Web Links
    ePath BDNF; http://www.ncbi.nlm.nih.gov/gene/627
    ePath CDH13; http://www.ncbi.nlm.nih.gov/gene/1012
    ePath CDH23; http://www.ncbi.nlm.nih.gov/gene/64072
    ePath CLOCK http://www.ncbi.nlm.nih.gov/gene/9575
    ePath CNTNAP2; http://www.ncbi.nlm.nih.gov/gene/26047
    ePath DRD4 (dopamine receptor D4); http://www.ncbi.nlm.nih.gov/gene/1815
    ePath DYRK1A; http://www.ncbi.nlm.nih.gov/gene/1859
    ePath H19 (H19, imprinted maternally expressed untranslated mRNA); http://www.ncbi.nlm.nih.gov/gene/283120
    ePath IGF2 (insulin-like growth factor 2 (somatomedin A)); http://www.ncbi.nlm.nih.gov/gene/3481
    ePath SLC6A3 (solute carrier family 6 (neurotransmitter transporter, dopamine), member 3); http://www.ncbi.nlm.nih.gov/gene/6531
    ePath SLC6A4 (solute carrier family 6 (neurotransmitter transporter, serotonin), member 4); http://www.ncbi.nlm.nih.gov/gene/6532
    ePath SNAP25; http://www.ncbi.nlm.nih.gov/gene/6616
    ePath XIST (X (inactive)-specific transcript); http://www.ncbi.nlm.nih.gov/gene/7503
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Gagne, Jeffrey R(Mar 2013) Personality and Temperament. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0005244.pub2]