Nenad M. Svrakic

Role of personality self-organization in development of mental order and disorder

Normal and abnormal personality development can be quantified in terms of 15 specific steps in the self-organization of character as a complex adaptive system. Character is measured as three dimensions of Self-directedness, Cooperativeness, and Self-transcendence, each with five components corresponding to steps in personality development. Each of these steps is differentially influenced by heritable temperament dimensions, antecedent steps in character development, and life experiences. Predictions about the nonlinear dynamics of personality development, such as equifinality and multifinality, are confirmed in longitudinal data about individuals representative of the general population. The stepwise development of character determines large differences between individuals in their risk of psychopathology, as well as varying degrees of maturity and health.

A general quantitative theory of personality development: Fundamentals of a self-organizing psychobiological complex

A general theory of personality and its development is described in terms of four quantitative dimensions of temperament and three quantitative dimensions of character. The four temperament dimensions (harm avoidance, novelty seeking, reward dependence, and persistence) are moderately heritable, moderately stable throughout life, and invariant despite sociocultural influences. The three character dimensions (self-directedness, cooperativeness, and self-transcendence) mature in a stepwise manner from early childhood throughout adulthood. Transitions between levels of maturity are nonlinear functions of temperament, specific genetic influences, social learning, and random life events. Personality development is quantitatively formulated in terms of nonlinear dynamics of a complex adaptive system. The psychosocial interpretation of personality as a fitness-optimizing process is described and illustrated in terms of available data about the development of different personality configurations. Several quantitative predictions of this theory of personality development are tested, including the sequence of emergence of the different character dimensions, individual differences in the development of stable temperament configurations, and the effects of sociocultural influences. The theoretical predictions agree with available empirical data and suggest many hypotheses for future developmental research, including etiological, dynamic, and therapeutic studies.

Temperament and Character Modify Risk of Drug Addiction and Influence Choice of Drugs

BACKGROUND Drug addiction and alcoholism involve a complex etiopathogenesis with a variable degree of risk contributions from the host (person), environment, and addictive substances. In this work, temperament and character features of individuals addicted to opiates or alcohol are compared with normal controls to study personality factors in the overall risk for drug addiction. METHODS The study was done in a permissive environment, with easy access to alcohol and heroin, which facilitated analyses of personality factors in drug choice. Participants included 412 consecutive patients (312 opiate addicts, 100 alcohol addicts) treated at the Specialized Hospital for Chemical Dependency in Belgrade, Serbia, and a community sample of 346 controls. RESULTS Opiate addicts manifested antisocial temperament configuration (high Novelty Seeking, low Reward Dependence) coupled with high Self-transcendence (ie, susceptibility to fantasy and imagination). Alcohol addicts manifested sensitive temperament configuration (high Novelty Seeking coexisting with high Harm Avoidance). Immature personality was observed far more frequently in opiate addicts than in alcoholics or normals. CONCLUSIONS Novelty Seeking appears to be a general risk factor for drug addiction. High Harm Avoidance appears to channel individuals with high Novelty Seeking towards alcoholism. Immature character traits and probable Personality Disorder increase the risk of illegal drugs. Based on equivalent research in nonpermissive environments, at least a portion of our opiate addicts could have developed alcoholism instead in environments with more limited access to opiates. Personality factors provide useful guidelines for preventive work with young individuals with personality risk factors for drug addiction.

Risk architecture of schizophrenia: the role of epigenetics.

Purpose of review To systematize existing data and review new findings on the cause of schizophrenia and outline an improved mixed model of schizophrenia risk. Recent findings Multiple and variable genetic and environmental factors interact to influence the risk of schizophrenia. Both rare variants with large effect and common variants with small effect contribute to genetic risk of schizophrenia, with no indication for differential impact on its clinical features. Accumulating evidence supports a genetic architecture of schizophrenia with multiple scenarios, including additive polygenic, heterogeneity, and mixed polygenic-heterogeneity. The epigenetic mechanisms that mediate gene–environment (GxE) interactions provide a framework to incorporate environmental factors into models of schizophrenia risk. Environmental pathogens with small effect on risk have robust effects in the context of family history of schizophrenia. Hence, genetic risk for schizophrenia may be expressed in part as sensitivity to environmental factors. Summary We propose an improved mixed model of schizophrenia risk in which abnormal epigenetic states with large effects are superimposed on a polygenic liability to schizophrenia. This scenario can account for GxE interactions and shared family environment, which in many cases are not explained by a single structural variant of large effect superimposed on polygenes (the traditional mixed model).

Cross-cultural validation of the revised Temperament and Character Inventory: Serbian data

OBJECTIVE In this work, we report data on construct validity and cross cultural applicability of the revised Temperament and Character Inventory (TCI R) (Cloninger, C.R., Przybeck, T.R., Svrakic, D.M., & Wetzel, R.D. (1999). The Temperament and Character Inventory-revised, Washington University, St. Louis), a 5-point scale scoring formatrevision of the original, true-false version TCI (Cloninger, C.R., Przybeck, T.R., Svrakic, D.M., & Wetzel, R.D. (1994). The Temperament and Character Inventory-A guide to its development and use, Washington University, St. Louis). Both versions are based on the seven factor Psychobiological Model of Personality (Cloninger CR, Svrakic, DM & Przybeck TR (1993). A Psychobiological Model of temperament and Character, Archives of General Psychiatry, 50, 975-990). METHODS The sample consisted of 473 normal adult subjects representing a number of Serbian cities and towns, recruited consecutively while registering at the National Employment Center, located in Belgrade, Serbia. The sample was the designed to be highly representative of urban and suburban population in Serbia to match to TCI R sample in the US. The 240-item, 5-point scale scoring TCI R was used to assess temperament and character traits. In addition to a number of other revisions, the scoring format in the TCI R was changed into a 5-point Likert scale to increase its sensitivity to subtle variations in personality expression. The TCI R mean scores and standard deviations were compared between Serbian and US subjects, internal consistency of the TCI R scales was estimated using Cronbachs alpha coefficients, and principal component analysis was used separately for temperament and character (because of their non-linear relationship) to test the underlying factorial structure of the TCI R. Parallel analysis and randomized simulation data were used to determine the number of factors for temperament and character. RESULTS The results generally supported the construct validity and the cross cultural applicability of the TCI R in Serbia. With a few exceptions, the observed internal consistency for the TCI R scales was acceptable. For the most part, the US and Serbian subjects manifested comparable temperament traits, whereas US subjects had higher character scores. The observed differences are understood as partly reflective of local culture and partly of dramatic socio-economic change in Serbia over the last 20 years. Principal component analysis fully supported the four factor structure of temperament and the three factor structure of character, as postulated by theory. The inadequacy of using linear statistical methods in studying complex non-linear systems such as personality is discussed in some detail.

A Multidimensional Psychobiological Model of Violence

Violence is an interpersonal activity influenced by a complex interplay of multiple psychosocial and neurobiological factors. In this chapter, we will describe a general psychobiological model of personality with multiple components, each of which has a distinct psychological description, neurobiological substrate, and genetic and environmental causes. This general model includes components of reactive aggression, like the impulsive-aggressive temperament traits described by Eysenck and Eysenck (1985) and Barratt and colleagues (in press), and components ofpredatary aggression, like the non-impulsive hostile attitudes described by Huesmann and others (Dodge & Newman, 1981; Heilbrun et al, 1978). First, we will describe the general model of personality briefly, and then I will relate the general model to violence and the causes of aggressive criminality in particular. The interaction of these components in the development of violence will be described as a complex adaptive system with nonlinear dynamics.