The process by which personality is formed as the result of social influences is called socialization. Early research methods employed case studies of individuals and of individual societies (e.g., primitive tribes). Later research has made statistical comparisons of numbers of persons or of different societies; differences in child-rearing methods from one society to another, for example, have been shown to be related to the subsequent behaviour of the infants when they become adults. Such statistical approaches are limited, since they fail to discern whether both the personality of the child and the child-rearing methods used by the parents are the result of inherited factors or whether the parents are affected by the behaviour of their children.
Problems in the process of socialization that have been studied by experimental methods include the analysis of mother-child interaction in infancy; the effects of parental patterns of behaviour on the development of intelligence, moral behaviour, mental health, delinquency, self-image, and other aspects of the personality of the child; the effects of birth order (e.g., being the first-born or second-born child) on the individual; and changes of personality during adolescence. Investigators have also studied the origins and functioning of achievement motivation and other social drives (e.g., as measured with personality tests). Several theories have stimulated research into socialization; Freudian theory led to some of the earliest studies on such activities as oral and anal behaviour (e.g., the effect of the toilet training of children on obsessional and other "anal" behaviour). Learning theory led to the study of the effects of rewards and punishments on simple social behaviour and was extended to more complex processes such as imitation and morality (e.g., the analysis of conscience).
Such concepts as self-esteem, self-image, and ego-involvement have been regarded by some social psychologists as useful, while others have regarded them as superfluous. There is a considerable amount of research on such topics as embarrassment and behaviour in front of audiences, in which self-image and self-esteem have been assessed by various self-rating methods. The origin of awareness of self has been studied in relation to the reactions of others and to the child's comparisons of himself with other children. Particular attention has been paid to the so-called identity crisis that is observed at various stages of life (e.g., in adolescence) as the person struggles to discern the social role that best fits his self-concept.
Attitudes and beliefs
Research into the origins, dynamics, and changes of attitudes and beliefs has been carried out by laboratory experiments (studying relatively minor effects), by social surveys and other statistical field studies, by psychometric studies, and occasionally by field experiments. The origins of these socially important predispositions have been sought in the study of parental attitudes, group norms, social influence and propaganda, and in various aspects of personality. The influence of personality has been studied by correlating measured attitudes with individual personality traits...