Logical reasoning in schizotypal personality

It was examined whether psychotic-like personality traits in a sample of 205 college students could predict logical reasoning deficits, akin to those seen in schizophrenia. The participants were tested on their ability to assess the logical validity of premises (Logical Reasoning Task), and completed a multi-dimensional schizotypy inventory (O-LIFE). Low accuracy was associated with increased levels of disorganized schizotypy (‘Cognitive Disorganization’), while elevated errors were associated with increased levels of positive (‘Unusual Experiences’), negative (‘Introvertive Anhedonia’) and impulsive (‘Impulsivity Non-conformity’) schizotypy. Nevertheless, multiple regression analyses revealed that negative schizotypy was retained as the only significant predictor after performance was corrected for random guessing, and the contribution of the average amount of time spent on each premise was controlled. The results suggest that, although most schizotypy dimensions have a detrimental effect on reasoning performance, possibly due to disadvantageous test-taking strategies, negative schizotypy is the most reliable predictor of logical reasoning deficits. It is proposed that social/interpersonal schizotypal traits, like negative symptoms of schizophrenia, are accompanied by deficient executive functions of working memory, which appear to undermine, inter alia, logical reasoning processing.     

Characteristics of schizophrenics' and neurotics' relatives

A group of adult first-degree relatives of schizophrenics were compared with a control sample of neurotics' relatives on the EPQ, an earlier version of the Eysenck P scale, and on three specially-constructed scales of ‘psychoticism’ (STA, STB and S), derived from a consideration of the clinical symptomatology of schizophrenia and of the ‘borderline syndromes’. Overall differences, in a predictable direction, were confined to the EPQ P scale where schizophrenics' relatives had significantly higher scores, though further analysis suggested that this was due partly to the raised scores of males and partly to very low P-scores seen in male neurotics' relatives. Scores on the STA, measuring schizophrenic ‘symptoms’, were very low in schizophrenics' relatives, due, it was argued, to extremely defensive responding in that group. Results are also reported for two psychophysiological measures, forearm EMG and skin conductance. Here marked group differences were observed, schizophrenics' relatives having significantly higher mean EMG and significantly lower mean skin conductance. This unusual pattern of response was especially evident in a small subgroup of schizophrenics' relatives whose personality profiles tended to differ in the predictable direction, towards greater ‘psychoticism’. The psychophysiological data were highly consistent with other results from our laboratory demonstrating a ‘dissociation’ between different measures of ‘arousal’ in high-P normal subjects and in psychotic patients and it was concluded that measures based on such a conception of the biological basis of schizophrenia offer considerable promise as high-risk indicators of psychopathology.     

Schizotypy and hemisphere function—II : Performance asymmetry on a verbal divided visual-field task

Following reports that psychotic patients show abnormal performance asymmetries on divided visual-field (DVF) tasks, a study was made of the relationship between performance asymmetries on a verbal DVF task in a group of normal Ss (18 male, 18 female) and self-report measures of personality. Interest was focused primarily on a new questionnaire, the STQ, which purports to provide measures of both ‘schizotypal’ and ‘borderline’ personality. It was hypothesized that high scoring on the ‘schizotypal’ scale would be associated with attenuation of performance asymmetry on the DVF task. The hypothesized correlation was found for males but not for females. The results are discussed in the context of theoretical issues central to the DVF method and are taken generally to support a continuity model of psychosis.     

Sex differences in the Schizotypal Personality Questionnaire Brief among Japanese employees and undergraduates: A cross-sectional study

Schizotypal personality may be seen as an indicator predisposition to schizophrenia and psychosis proneness. Schizotypal personality traits behave differently depending on a person’s age and sex, but few studies have examined the causal relationship between age-related sex differences and schizotypal personality traits. The aim of the present study was to examine the relationship between the schizotypal personality and sex in different age groups. In our study, we used the Schizotypal Personality Questionnaire Brief (SPQ-B). Participants were 371 college students (107 men) with an age range from 18 to 25 years, and 322 working people (156 men) with an age range of 22–67 years. The results showed that the young adult males in the college student group had tendencies to score higher than females in the same group on the SPQ-B total score and its two subscale scores (the cognitive-perceptual and the interpersonal scores). In the adult sample taken in the working people group, the total score and subscale scores of the SPQ-B did not significantly discriminate male subjects from female subjects. These findings indicate that sex differences of schizotypal personality traits may reflect differential age-related variation.     

Schizotypal personality traits and prediction of one's own movements in motor control: what causes an abnormal sense of agency?

Background. Positive schizophrenic symptoms, especially passivity phenomena, including auditory hallucinations, may be caused by an abnormal sense of agency, which people with schizotypal personality traits also tend to exhibit. A sense of agency asserts that it is oneself who is causing or generating an action. It is possible that this abnormal sense of self-agency is attributable to the abnormal prediction of one’s own movements in motor control. Method. We conducted an experiment using the “disappeared cursor” paradigm in which non-clinical, healthy participants were required to click on a target using an invisible mouse cursor. Prediction error was defined as the distance between the target and the click point. Results. The results showed that schizotypal personality traits, but not depressive or anxious traits, were correlated with deficits in predicting movements of the subjects’ left hand. In particular, auditory hallucination proneness had the strongest relationship with movement prediction error. In this report, we also discuss the error tendency (overestimations or underestimations of one’s own movements). Conclusions. This finding is in accordance with the idea that passivity phenomena or proneness may be caused by the abnormal prediction of one’s own actions or movements.     

Neuropsychological profile in patients with schizotypal personality disorder or schizophrenia

Neuropsychological impairments have been consistently reported in patients with schizophrenia. As little is known whether subjects with schizotypal personality disorder exhibit neurocognitive dysfunction similar to that in schizophrenia, we assessed the neuropsychological profile of 15 subjects with schizotypal personality disorder and compared it with that for 15 patients with schizophrenia and for 15 psychiatrically normal volunteers. All participants were administered a standard neuropsychological battery assessing language ability, spatial ability, visuomotor function, verbal memory, visual memory, auditory attention, visual attention, and executive function. Performance on most of the cognitive domains was impaired in patients with schizotypal personality disorder but less than patients with schizophrenia. Specifically, impairment in verbal memory and visuomotor ability in patients with schizotypal personality disorder and patients with schizophrenia were comparable, while patients with schizophrenia performed worse on the test of executive function than did patients with schizotypal personality disorder. As a whole, cognitive deficits in patients with schizotypal personality disorder were qualitatively similar to, but quantitatively milder than, those for patients with schizophrenia. The results suggest that cognitive abilities related to frontotemporal lobe function are disturbed across these schizophrenia-spectrum disorders.     

How magic survived the disenchantment of the world

This article argues that the process described by Max Weber as the ‘disenchantment of the world’ is compatible with the continued vitality of ‘the occult’ in contemporary western culture. Focusing on the example of ‘hermetic’ magical traditions in western culture before and after the pivotal period of the Enlightenment, the article analyses the relation between continuity and change in the development of these traditions from three angles: their theories of magical efficacy, the nature of their practices and the ways in which magicians seek to legitimate magic to the wider society as well as to themselves. The discussion demonstrates that the transformation of magic under the impact of modernization and secularization resulted in the paradoxical phenomenon of a ‘disenchanted magic’. The article concludes by proposing a theory that explains why it is actually quite natural for magic to have survived the disenchantment of the world.     

Borderline defenses and Rorschach responses: a critique of Lerner, Albert, and Walsh

Collapsing DSM-III schizotypal and borderline groups to form a borderline population is unwarranted when the results are then related to borderline personality organization. In a comparison of overlapping scoring systems for inferring defensive operations, Lerner, Albert, and Walsh intertwine fact and theory extravagantly and are not justified by their chosen populations nor their assumptions about the theories involved.     

Projection and Behavior: A Rorschach Study of Assaultive Mental Hospital Patients

Collapsing DSM-III schizotypal and borderline groups to form a borderline population is unwarranted when the results are then related to borderline personality organization. In a comparison of overlapping scoring systems for inferring defensive operations, Lerner, Albert, and Walsh intertwine fact and theory extravagantly and are not justified by their chosen populations nor their assumptions about the theories involved.     

Vigilance, personality and strength of the nervous system

Numerous attempts have been made to explain the overall level of performance and the change in performance over time in vigilance tasks in terms of the proposed inverted U relationship between performance and ‘arousal’. The present experiment investigated the effects on vigilance performance of the following variables: introversion, neuroticism, time of day, accessory sensory stimulation, ‘signal frequency’ and time on task. Some measures of subjective state and body temperature were also included. The behavioural measures of overall performance revealed interactions involving neuroticism and time of day, and between neuroticism and frequency. This may reflect the operation of response bias factors, though these may be influenced by ‘arousal’. There were also main effects for several of the factors which may have practical significance. There was a significant effect of time on task on all the behavioural measures but no clearcut effects of personality on the vigilance ‘decrement’. It is argued that the latter may not provide the most satisfactory test of the inverted U model and its relationship to personality. However, interactions between noise and time on task for some of the measures may have practical importance. Measures of subjective state showed a fall in the reported level of ‘arousal’ accompanied by a rise in reported ‘stress’ and ‘anxiety’ with time on task. Body temperature was higher after the task than before.     

Relationship between schizotypal and borderline traits in college students

The main objective of the present investigation was to analyze the relationship between self-reported schizotypal and borderline personality traits in a sample of 759 college students (M = 19.63 years; SD = 2.03). For this purpose, the Schizotypal Personality Questionnaire-Brief (SPQ-B; Raine and Benishay, 1995) and Borderline Personality Questionnaire (BPQ; Poreh et al., 2006) were administered. The results showed that schizotypal and borderline features are partially related at subclinical level. The exploratory factor analysis conducted on the subscales revealed a three-factor solution comprised of the following factors: Identity/Interpersonal, Lack of Control and Schizotypal. The canonical correlation analysis showed that schizotypal features and borderline personality traits shared 34.8% of the variance. The data highlight the overlap between schizotypal and borderline personality traits in nonclinical young adults. Future studies should continue to examine the relationship and the degree of overlap between these traits in community samples.     

Intelligence, reaction time (RT) and a new ‘odd-man-out’ RT paradigm

A sample of adult Ss of reasonably normal intelligence were given an ‘IQ’ test, a series of RT tests using 0, 1, 2, 3 bits of information in a Hick paradigm and an RT task requiring choice of 1 of 3 lights as an ‘odd-man-out’ on the basis of its relative position. Negative correlations were found between both RT and measures of variation in RT and ‘IQ’ for both of the two tasks. Recent results showing no correlation between Hick slope and ‘IQ’ and no increase in correlation between ‘IQ’ and RT with increasing number of bits, are confirmed. An explanation for findings of Ss whose RT data do not conform to Hick's law is tested and found inadequate. The ‘odd-man-out’ task is found to show an effect of ‘learning’ across the period of the task, the size of the learning effect was found also to correlate with ‘IQ’, but no evidence for learning was found with the choice RT task.     

Bicultural identities: The interface of cultural, personality, and socio-cognitive processes

This paper presents recent work examining the meaning and impact of individual variations in the way bicultural individuals organize their two cultural identities, a construct that we call Bicultural Identity Integration (BII). While biculturals high on BII describe their two cultural identities as ‘compatible’ (fluid and complementary), biculturals low on BII experience them as largely ‘oppositional’ (i.e., conflicting and disparate). We first report experimental evidence for how variations in BII moderate biculturals’ socio-cognitive behavior, specifically, the way in which bicultural individuals process cultural knowledge and use it to interpret social behavior. We then report structural equation modeling findings that elucidate some important personality, contextual, and performance predictors of BII. Finally, we conclude with a brief discussion of how the study of bicultural identities provides an ideal ground for the integration of cultural and personality psychology.     

A critical examination of Michael Polanyi's conception of skills

In this paper I will consider some of the main issues in Michael Polanyi's discussion of ‘Skills’ from Chapter 4 of his book Personal Knowledge published in 1958.The concept of ‘skill’ features prominently in psychological theories of human performance in activities such as games, gymnastics, swimming and dance; such theories are often applied to other spheres of human activity in which issues about skill acquisition arise. It is not surprising to discover that skill theory is considered to be essential to the study of human movement and physical education. Physical education teachers in schools have consistently maintained that ‘skill acquisition’ is a major objective for the P.E. curriculum — see Kane 1974. Yet concepts such as ‘skill’, ‘ability’ and ‘know-how’ are constituent features of practical knowledge therefore the notion of ‘skill acquisition’ on its own will not do as a curriculum objective since all instances of skill and practical knowledge are specific to their contexts, namely, to different practical activities. If particular activities are valued in schools in the pursuit of children's learning and education it seems necessary to clarify the epistemological features of such activities in order to understand what it means to teach them and what it means for children to learn and know-how to perform them successfully. It is in these respects that the concept of ‘skill’ in different human activities should attract the interest of physical education students. In order to draw attention to major features of Polanyi's thesis on the nature of ‘skill’ I shall consider the relevance of his ideas about skill and knowledge in relation to human action theory. I suggest that misconceptions may arise in teaching and learning theories relating to ‘playing soccer’ if the basic underlying ideas about ‘skill’ in human activities are inconsistent with ideas about human action or, say, practical reasoning. It is this issue that is not, in my view, attended to by Polanyi in his discussion of ‘skill’. Thus, if my criticisms of Polanyi's ideas are shown to be valid it will be necessary, by implication that is, to exercise caution before any attempt is made to use his thesis as a basis from which to formulate ideas about teaching skills and skill acquisition. The extensive use I make of quotations from Polanyi's writings is necessary because it is towards Polanyi's use of language in his explanation of ‘skills’ that much of my criticism is directed. It is hoped that what follows may provide students of human movement and physical education with an insight into Polanyi's view of ‘skills’ in particular and to issues related to skill theory and human action in general.     

A psychometric analysis of five DSM-III categories

Preliminary studies of interdiagnostician agreement have shown that the DSM-III holds promise for improving diagnostic reliability. This study examined the characteristics of five DSM-III diagnostic categories (schizophrenia, mania and schizotypal, narcissistic and borderline personality disorders) with respect to three psychometric criteria. Examined were the specificity, syndrome association and internal consistency of the diagnostic criteria for these disorders. Results suggested that of the diagnostic categories examined, the criteria for schizophrenia performed best under empirical scrutiny, while criteria for borderline and narcissistic personality disorders were more problematic. Suggestions are made for subsequent investigations into the internal validity of DSM-III.     

How brain arousal systems determine different temperament types and the major dimensions of personality

Theory and research is described which led to the hypothesis that the choleric (E+N+) and melancholic (E−N+) temperaments are determined by differences in thalamocortical inhibition of brain-stem processes. An opportunity to test this hypothesis was provided by the recent discovery of 4, 7, and 10 Hz response waves confounded in EEG averaged evoked potentials [Robinson, D. L. (1999b). The technical, neurological, and psychological significance of ‘alpha’ ‘theta’ and ‘delta’ waves confounded in EEG evoked potentials: 1. A study of peak latencies. Electroencephalography and Clinical Neurophysiology, 110, 1427–1434; (2000). The technical neurological, and psychological significance of ‘alpha’, ‘delta’, and ‘theta’ waves confounded in EEG evoked potentials: A study of peak amplitudes. Personality and Individual Differences, 28, 673–693]. These responses are attributed to the brain-stem, limbic, and thalamocortical arousal systems, respectively, and in the cited reports principal components analysis of data obtained from 93 participants confirmed the existence of predicted excitatory and inhibitory relationships. ANOVA was used in the present study to test the further prediction that there should be strong inhibition of the 4 Hz system by the 10 Hz system in melancholics (E−N+) and weak inhibition of the 4 Hz system in cholerics (E+N+), with median inhibition predicted for the other temperament types. There was a large and statistically significant difference between the mean scores on the PCA inhibition factor obtained for the temperament groups, with temperament defined in terms of high and low EPQ extraversion (E) and neuroticism (N) scores. The significance of these results is discussed with reference to fundamental questions raised by Pavlov's pioneering research but left unanswered for the best part of a century. Implications for the future conduct of personality research are also considered.     

Sex differences in schizotypal personality in a nonclinical population.

This study tests the hypothesis that normal women will score higher on the more "positive" features of schizotypal personality and normal men will score higher on more "negative" schizotypal features. Two samples (n = 393, 394) were administered the Schizotypal Personality Questionnaire, which contains subscales corresponding to the 9 schizotypal personality traits outlined in the Diagnostic and Statistical Manual of Mental Disorders (rev. 3rd ed.; American Psychiatric Association, 1987). Women scored significantly higher on the positive subscales of Ideas of Reference and Odd Beliefs/Magical Thinking, and men scored significantly higher on the negative subscales of No Close Friends and Constricted Affect. These findings replicated from one sample to another. These results are broadly consistent with previous findings on schizotypal personality and schizophrenia. It is hypothesized that sex differences in schizophrenic symptomatology may in part reflect an exaggeration of normal sex differences in the general population.