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ABSTRACT
History
The awareness of a peculiar style of behavioural functioning in individuals, basically regarding emotional nature and associated to personality present in Greek Medicine. Since ancient times, it still prevails.
Hippocrates in V a.D. described four types of individuals: the sanguine or cheerful type, the melancholic or of black bile, the irritable associated to an increase of yellow bile, and the phlegmatic (due to a phlegm excess), present in the passive or calmed type of individual.
This old concept is present in more recent theories that emphasize the relationship between temperament and neurotransmissers (Bond, 2001) and between these and specific receptors, genetically determined, associated to certain temperamental features (Cloninger, 1987, 1996; Auerbach, 2001). The concept of biological-genetics, and the “humoral” theory that support the idea that emotions constitute a distinctive feature of the temperament, remain valid for contemporary theories.
Categorical vision
In 1968, A. Thomas, S. Chess and H. Birch revolutionized the temperament´s concept in childhood pointing out the innate behavioural quality in contrast with predominant theories that considered children as passive recipients of external influences, as had been proposed in former unilineal and unidirectional models. They established nine behavioural categories present from birth: activity level; regularity or rhitmicity in biological functions, as feeding, sleep and elimination; approach to new stimuli like foods, toys or people; adaptability to new situations; answer threshold to stimuli; intensity of the reaction; humour quality; attention and distractibility as well as persistence. They pointed out 3 temperamental styles that are combinations of these categories: easy temperament (40% of their sample), difficult temperament (10%) and slow to warm up (15%), the remaining percentage constitutes mixtures of these 3 basic types.
These authors also developed the concept “goodness or poorness to fit” to make reference to a particular style to respond to the environment.
Traits´ vision
Goldsmith (1987) and Plomin (1993): considered emotions, activity and sociability as important temperamental domains. Rothbart (1988, 1989) highlighted the self-regulation and reactivity as a nuclear element of temperament; this author considered auto regulation as a group of processes to modulate (facilitate or inhibit) reactivity and include attention, approach or retreat, attack or inhibition as well as the ability to calm. This author also designed a temperament questionnaire for children.
Profiles´ vision
Kagan et al. (1987) developed the term of shyness or behavioural inhibition as a profile type of infantile behaviour, which is stable and present in 20% of the children. This profile contrasts with disinhibited type of children that approach without fear to events and people, and it comprise, 40% of the sample.
These authors also studied the relationship between these profiles and their neurobiologic response types. Shyness is associated to stable heart rates, high stress hormones levels like cortisol and norepinephrine, arterial blood pressure modifications and some changes in the voice parameters when speaking under stress cognitive conditions. Different studies have been done, to study the association between cortisol, shyness and insecure attachment, not present in secure attachment (Nachmias, 1996).
Genetics, temperament and neurotransmissers
Longitudinal studies in monozygotic twins (Robinson and cols., 1992) have identified the heretability basis of behavioural inhibition, they also suggested gene activation and deactivation in different stages of the child development (Cherny, 1994; Plomin, 1993). The first report of an association between a temperament feature such as novelty seeking (which is a response to novel stimulus), and a gene for the dopamine receptor (DrD4), was first published in 1996 in Nature Genetics (Cloninger, et al. 1996) and establishes a landmark in temperament research. The theory is that individuals with (DrD4) dopamine gene lacked in dopamine and they search for novelty experiences to increase dopamine release.
Toward convergence of models and theories.
The recognition that personality traits represent temperament psychobiological domains (Eysenck, 1992, 1997; Tellegen, 1985; Watson and Clark, 1993), will allow convergence of models and theories that basically would recognize:
1. The genetic component of personality or temperamental traits.
2. Core dimensions of personality studied in adults, such as neuroticism and extraversion, or behavioural inhibition in children, are associated to the affective experience and give support to the neurobiological basis of affection and emotion in temperament.
3. After decades of studies, investigators have converged in a phenotypic taxonomy of personality.
4. Research models in adults are being tested in children and children´s longitudinal research will help researchers to understand temperament and personalities at long life views.
The most recent models of temperament like the “Big Three” are studies derived from the theories of Eynseck; Tellegen, Watson and Clark developed their own Big Three model. Cloninger (1987) described a psychobiologic model which consisted of three dimensions genetically independent (novelty seeking, harm avoidance, and reward dependence).
Temperament and psychopathology
A major challenge nowadays is the study of temperament and its contribution to adaptative or maladapatative mechanisms in different healthy or psychopathological responses. Controversy remains regarding temperamental traits, debating wether these are risk factors or symptoms of a disorder (Graham and Stevenson, 1987).
Some examples of these associations include the following characteristics:
Difficult temperament and behaviour dysfunctions (Thomas et al., 1968), behavioral inhibition and anxiety dysfunctions (Biederman, 1993), extraversion factor and alcoholism problems (Wennberg, 2002), behavioural desinhibition and attention deficit disorder (Hirshfeld-Becker et al., 2002) and novelty seeking and substance abuse (Rose, 1995).
Finally, temperament as a protective factor has been pointed out by Werner and Garmezy longitudinal studies who established activity and sociability as important traits present in the development of resiliency.
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