Epileptic tendencies in relation to behavioral responses to a novel environment in the Mongolian gerbil

The severity of epileptic-like seizures in gerbils (Meriones unguiculatus), placed in an open field, is directly related to their ambulatory activity on subsequent trials. An inverse relationship, however, occurs between seizure severity and oriented, bipedal rearing behavior on subsequent trials. Principal components and multiple linear regression analyses support the hypothesis that ambulation and rearing have different underlying neuronal mechanisms. If these two activities are considered as measures of arousal and attention, respectively, then epileptic-like seizures may be caused by hyperactivity of mechanisms which induce arousal.     

Types produce types—Especially fathers

Employing a larger sample and a more stringent statistical criterion, this study replicated an attempt by T. G. Grandy and R. F. Stahmann (Journal of Vocational Behavior, 1974, 5, 231–239.) to test Holland's hypothesis that parents' personality types foster similar offspring personality development. The relationships between paternal and offspring personality types were consonant with the findings of Grandy and Stahmann but the role of maternal personalities remained unclear. An explanation was offered that fathers' personality types carry more weight in the development of offspring types.     

Types produce types: An examination of personality development using Holland's theory

This study was designed to test Holland's hypothesis that parents encourage the development of their own personality types in their offspring. Data were collected by personal interviews from three freshmen classes at a large midwestern university. Parent's personality types (occupations) were compared to offsprings' personality types (expressed occupational choices) using the Kolmogorov-Smirnov one-sample test to determine whether or not the comparisons were due to chance. The results indicated that relationships existed between the personality types of fathers-sons, fathers-daughters and mothers-daughters while no relationship was confirmed between mothers-sons.     

Delinquent personality types and the situational contexts of their crimes

Eysenck's theory is quoted as an example of a dispositional crime theory. This is in direct contrast to situational crime theory which rejects the notion of the influence of fixed psychological characteristics and stresses the importance of immediate situational stimuli in the explanation of crime. Recent studies of Eysenck's theory have argued the heterogeneity of personality types in the delinquent population, and following Eysenck's suggestion the offences committed by different personality types have been investigated. In the absence of positive results the present research seeks to progress beyond the offence label to compare different personality types on a range of offence-related situational features. This is viewed as an attempt to accommodate situational considerations in what remains essentially a dispositional approach. Similar deliquent personality types to recent studies merge, but they could not be distinguished across the situational-context factors of their offences. However, an alternative methodology to investigate this question is proposed.     

The effects of aggressive pornography on beliefs in rape myths: Individual differences

This experiment assessed the effects of media depictions that portray rape myths on men's beliefs in such myths. The study was conducted in two separate sessions. At the orientation session, measures of personality, motivation, experience, and aggressive tendencies were administered to 307 males. In the experimental session, 145 of these men were first exposed to one of eight audiotaped versions of a passage. One of these portrayed the myth that rape results in the victim's sexual arousal. Later, subjects listened to a second passage depicting either nonconsenting or consenting sex. Their perceptions of the second portrayal and their beliefs in rape myths were then measured. The findings provided support for the hypothesis that media depictions suggesting that rape results in the victim's arousal can contribute to men's beliefs in a similar rape myth. Moreover, analysis of the mediating role of individual differences indicated that men with relatively higher inclinations to aggress against women are particularly likely to be affected by media depictions of rape myths. It is suggested that these data may be explained best on the basis of information retrieval processes. In addition, it was found that power motives were consistently related to greater beliefs in rape myths.     

Identifying the psychopath: The relation of Cleckley's criteria to the interpersonal domain

The relationship between interpersonal behaviour variables has been shown to be defined by a circular ordering, or circumplex, within the framework of a two-dimensional space. It is proposed that Cleckley's criteria of psychopathy represent one axis of this system, hostility vs warmth. It is also proposed that these criteria alone are not sufficient to identify a homogeneous group of deviant persons. Observer ratings of the behaviour of institutionalized mentally-disordered offenders were obtained for Cleckley's criteria and for behavioural dimensions of impulsive aggression and sociability. Cleckley's criteria were found to describe a unitary dimension whose relationship to other variables was consistent with the circumplex model. Cluster analysis of the ratings identified two distinct groups of high scorers on Cleckey's criteria, who were also significantly differentiated by self-report personality variables. Only one of these groups showed the combination of lack of warmth or affection and lack of behavioural control which several investigators consider necessary to define psychopathy. Relationships among individual rating items and some of the personality variables closely approximated the expected circular ordering. Reference to this interpersonal circumplex appears to reconcile some of the differences in current conceptualizations of psychopathic personality.     

Sex and cultural differences in the factorial structure of the self-directed search

Holland's Self-Directed Search was administered to 247 male and 252 female high school students, aged 16 to 18 years, attending state schools in New Zealand. Principal factor analysis was used in an attempt to identify six orthogonal factors analogous to Holland's six personality types. The Social and Enterprising scales could not be split into two factors in either sample, and the Investigative and Realistic scales defined a single factor for the female students. Computed distances between pairs of the six personality types in five dimensional factorial space were compared with the relative ordering of the distances expected from Holland's hexagonal model. The positions of the types in space corresponded more closely with the model for the males than they did for the females. The results, in conjunction with those of similar studies in Israel and the United States, imply that the correspondence between some summary codes on the SDS and existing occupational classifications based on Holland's types may be less than perfect, particularly for females. Also, care should be taken when using codes on the SDS to calculate Holland's indices of “consistency,” especially for females.     

Prototypicality and personality: Effects on free recall and personality impressions

An experiment was performed to test the hypothesis that it is easier to process information about characters who fit well with and are, therefore, “prototypical” of shared beliefs about various personality types. Character prototypicality was manipulated in a free recall and personality impression paradigm through variations in the consistency of a character's identification with preexisting beliefs about two personality-type categories—extraversion and introversion. Subjects also were given information about each character that varied in degree of abstraction from traits to concrete behavior. As predicted, both the amount and nature of the information correctly recalled were significantly affected by the consistency of the character's identification with extraversion or with introversion. Character consistency also significantly affected the amount of material written in the personality impressions and the tendency to qualify the generality of the impressions. The results support a model in which incoming data about personality are coded, structured, elaborated, and remembered according to the quality of their match with preexisting beliefs about various personality types.     

Information-gathering strategies in hypothesis-testing

Three experiments were conducted to investigate the informational factors affecting the kinds of questions people ask for testing a hypothesis about another's personality. In Experiment 1, subjects formulated by themselves questions to test either the hypothesis that the interviewee is polite or the hypothesis that he is impolite. The boundary of the hypothesis was set either at an extreme or at an intermediate point on the trait dimension. Experiment 2 also varied the location of the boundary, but the hypotheses concerned extroversion-introversion and subjects chose questions from a predetermined list of questions that asked either about extroverted features or introverted features and that were either low or high in diagnostic value. Both studies found that subjects preferred to ask about features that are consistent with the hypothesis only when the boundary was extreme. In contrast, diagnostic features were preferred in all conditions. Experiment 3 showed that subjects' judgment of the diagnosticity of the various kinds of questions for discriminating at different boundaries paralleled subjects' preferences among these questions. These results were interpreted as providing support for the diagnostic strategy in social information gathering.     

Impulsivity in adults: motor inhibition and time-interval estimation

There is a need for the development of behavioral measures of impusivity in order to elucidate the specific qualities of impulsive persons. The relationships between two behavioral measures of impulsivity and several personality inventories frequently used to assess inpulsivity were examined using 40 male Ss. The behavioral measures involved a motor-inhibition (MI) task and time-interval (TI) estimation. The personality measures included the Extraversion (E), Psychoticism (P) and Neuroticism (N) scales of the Eysenck Personality Questionnaire (EPQ), Barrat's Impulsivity Scale (BIS) and Gough's Socialization Scale (So). Significant relationships between MI scores and E, BIS and a proposed dimension of impulsivity obtained by the formation of E-P quadrants were found. In addition, performance on this task was related to So, P and E-N quadrants in the predicted directions. The consistency of these results supports the use of this task as a behavioral measure of impusivity in adults. Although personality inventory scores were not related to estimations, significant (negative) correlations were obtained between TI estimations and MI scores. The results indicate that TI estimation by itself is not an adequate measure of impulsivity, but does have implications for understanding impulsive behavior.     

Stability of individual differences in personality characteristics from 3 to 15 years

Ratings of 23 personality variables on a longitudinal sample of 97 children at the ages of 3, 7, 11 and 15 yr had previously been shown to yield orthogonal factors of high continuity of structure across ages. Subjects' scores on these factors were employed to derive stability coefficients over these ages. The general level of obtained r's is modest, but is higher for measures of Extraversion-Introversion (EI) and other broad factors (Neuroticism (N), Melancholic-Sanguine (MS), and Choleric-Phlegmatic (CP)) than for narrower Varimax factors (EI, Melancholic and Activity), except in the case of Choleric. Complete regression factor scores proved more satisfactory than an inexact method. Global ratings of EI and N yielded similar r's to the factor measures.The effects of correcting for rater unreliability and possible values of ‘protocol’ unreliability are examined. Even in the case of a maximal correction, stability tends to be lower than is found for IQ data, suggesting greater instability of the underlying personality variables.Lawley's test of heterogeneity of correlation matrices provides only limited evidence of a simplex pattern across ages, and virtually none of a ‘sleeper effect’. Jennrich's test of differences in matrices provides no evidence of sex differences in stability.Results on stability of the specific variables are also reported. They show, with few exceptions, lower stability than factor variables. Jennrich's test yielded significant sex differences on only three specific variables.     

Distinctive career orientations of Holland personality types

The primary source of empirical support for Holland's (1973) assumption that people tend to prefer and search for environments that are consistent with their dominant personal characteristics has been research on the tendency of college students to choose congenial college environments. The purpose of this study is to determine if a sample of male college students, classified according to Holland's six personality types, also prefer occupational environments that are consistent with their primary personal orientations. Stepwise, discriminant analysis procedures are used to test the null hypothesis that there are no statistically significant differences in the characteristics of occupational environments preferred by male students classified according to Holland's personality types. The relationship of the results of this analysis to possible improvements in the areas of career counseling and placement services and future research on job satisfaction in complex organizations is discussed.     

Psychoticism and marital satisfaction

The author has tested the hypothesis that psychoticism, as described in Eysenck's theory of personality, is related to marriage outcome. Thirty happy and 30 unhappy couples answered the Eysencks' EPQ questionnaire. The unhappy husbands and unhappy wives scored significantly higher on the P scale than their happy counterparts respectively. The results suggest that psychoticism (like neuroticism) may impair the marriage satisfaction. In addition, happily married spouses show greater similarity with respect to personality than do unhappily married spouses. Thus the results support the likeness and go counter to the complementaries theories of marital satisfaction.     

Individual differences in interspecific aggressiveness: Mouse-killing in rats after isolation

Measures of extraversion and neuroticism in rats are related to aggressive behaviour in two strains of rats. Isolated rats and rats reared together, of the Sprague-Dawley and Wistar strains, were submitted to an aggressiveness test. The results show that isolation generates and/or increases mouse-killing behaviour only in Wistar rats which are more emotional (neurotic) than Sprague-Dawley rats. The two strains do not differ significantly in their open-field ambulation (extraversion), although Wistar rats tend to be less ambulatory. Within the Wistar strain, the results showed the same trend, that is, the more emotional and less ambulatory rats (dysthymics) are the ones who became killers after isolation. The Sprague-Dawley strain does not show any significant aggressive behaviour after isolation.     

Crossfostering in mice selectively bred for high and low levels of open-field thigmotaxis

The main purpose of this research was to investigate whether the difference in open-field (OF) thigmotaxis between mice selectively bred for high and low levels of wall-seeking behavior originated from genetic or acquired sources. Unfostered, infostered, and crossfostered mice were compared in two experiments in which the effects of strain, sex, and fostering on ambulation, defecation, exploration, grooming, latency to move, radial latency, rearing, thigmotaxis, and urination were studied. These experiments revealed that OF thigmotaxis was unaffected by the foster condition and thus genetically determined. The selected strains of mice also diverged repeatedly with regard to exploration and rearing. The findings are in line with the previously described existence of an inverse relationship between emotionality and exploration.     

A construct validation of the Objective-Analytic Test Battery (OATB)

The scales of Cattell's Objective–Analytic Test Battery (OATB) and the factors derived from the factor analysis of the subtests of the OATB were located with respect to a wide range of ability and personality variables, including the 16PF and Cattell's Comprehensive Ability Battery. The expected relationships between the OATB scales and the personality measures did not emerge. However, it was found that many of the OATB scales were highly correlated with ability factors. It is concluded that in Britain, and in its present form, the OATB is not a viable instrument for measuring personality traits.     

Drug postulate of Eysenck in the rat

The present work is an attempt to investigate the Drug Postulate of Eysenck in the animal field. The Ss were 36 male Wistar rats. The extraversion measure used was animal ambulation in a low-frightening open-field. d-Amphetamine, reserpine and saline were administered before the extinction of a lever-press FR 25 schedule for food. The results show that reserpine produces a decrement in the resistance to extinction (RExt), while d-amphetamine produces a biphasic effect, increasing the RExt in high-ambulatory (extravert) rats and leaving the RExt of low-ambulatory (introvert) rats unaffected. Therefore, reserpine acted as a depressant drug, d-amphetamine as a stimulant drug and ambulation as extraversion.     

The relationship between Eysenck's major personality dimensions and simultaneous and sequential processing in children

The present study reexamined Eysenck's hypothesis that intelligence and personality are uncorrelated. Intelligence was measured with the Kaufman Assessment Battery for Children, yielding scores for simultaneous and sequential processing and achievement, and the Woodcock-Johnson Brief Scale. Personality was assessed with the Junior Eysenck Personality Questionnaire. Ss were 105 children, ages 8$\text{1}\text{2}$10$\text{1}\text{2}$yr. Although a process as well as a product-oriented intelligence test was employed, the correlational and discriminant analyses supported Eysenck's original hypothesis.     

Personality variables and cognitive inconsistency

The present research studied the relationships between personality variables and cognitive inconsistency. Cognitive inconsistency was defined on the basis of the cognitive orientation theory of Kreitler and Kreitler (1972, 1976) as inconsistency and three personality variables: Extraversion, Cattell's factor “Independence” and Cattell's factor “Radicalism- Conservatism”. The implications of these results to Eysenck's and Cattell's theories were discussed.     

The extended genotype: the heritability of personality accounts for the heritability of recalled family environments in twins reared apart

Abstract How are retrospective accounts of family rearing environments linked to adult personality? We addressed this question by measuring both domains in a sample of 180 reared‐apart twins. Twins completed extensive measures of rearing environments (the Minnesota‐Briggs History Record, the Block Environmental Questionnaire, the Family Environment Scale, and the Physical Facilities Questionnaire) and an omnibus measure of adult personality (the Multidimensional Personality Questionnaire). Retrospective accounts of family environments were partially heritable and all the heritable variance in environmental measures could be accounted for by heritable variance in personality. In addition, differences between twins in their accounts of their rearing environments (nonshared environmental factors) were not significantly linked to differences between twins in their personalities. Hence, family environmental measures appear to be heritable because personality genes influence the way people shape and recall their rearing environments. In addition, differences in reared‐apart twins' retrospectively recalled rearing environments appear to have little impact on differences in their personalities in adulthood.