Depression vs. paranoia: Why are there sex differences in mental illness?

Sex differences in proneness to depression and paranoia are seen as reflecting caricatures of women s and men's stereotypical role in a male-dominated, exploitative society Following its major hypothesis that mental illness arises out of failures in the sociability that is inherent in our species, the paper discusses some of the evidence for sex differences in sociability, and some evidence from studies of sex differences in field dependence which, taken together, suggest a sex difference in proneness to shame and guilt This sex difference in ‘superego” style is a mediating factor in proneness to depression and paranoia     

Do sex differences in emotionality mediate sex differences in traits of psychosis-proneness?

The aim of the study was to determine if sex differences in emotionality might account for sex differences in distinct traits of proneness to psychosis (or "schizotypy"). Females report higher levels of "positive" schizotypy (e.g., magical thinking) than males, along with a tendency toward greater schizotypal disorganisation, whereas males report higher levels of "negative" schizotypal traits, such as social anxiety (Jackson & Claridge, 1991; Raine, 1992). Given the affect-oriented nature of "negative" schizotypal traits, we tested the hypothesis that higher levels of "negative" schizotypy among males would be accounted for by more general sex differences in emotionality; that is, by less frequent and less intense emotional experiences. A total of 81 student participants were administered the Cognitive-Perceptual Deficits, the Disorganisation, and the Interpersonal Deficits components of Raine's (1991) Schizotypal Personality Questionnaire (SPQ), indexing respectively, "positive" schizotypy, schizotypal disorganisation, and "negative" schizotypy. Frequency of emotional experience was assessed using the Emotionality subscale (Buss & Plomin, 1984) and intensity, the Affect Intensity Measure (Larsen & Diener, 1987). As predicted, males scored significantly higher than females on the SPQ Interpersonal Deficits component but no sex differences emerged for the other two components. Males reported significantly less intense, although not less frequent, experiences than females. A reduced intensity of positive emotions in particular was found to mediate the sex difference in "negative" schizotypy. Our results suggest that a less intense experience of positive affect might contribute to males' propensity to develop negative symptoms should a schizophrenic breakdown occur.     

Culture and self: are there within-culture differences in self between metropolitan areas and regional cities?

Although differences in self-conception across cultures have been well researched, regional differences within a culture have escaped attention. The present study examined individual, relational, and collective selves, which capture people's conceptions of themselves in relation to their goals, significant others, and in groups, comparing Australians and Japanese participants living in regional cities and metropolitan areas. Culture, gender, and urbanism were found to be related to individual, relational, and collective selves, respectively. Australians emphasized individual self more than Japanese, women stressed relational self more than men, and residents in regional cities regarded collective self as more important than their counterparts in metropolitan areas. These findings provide support for the tripartite division of the self and suggest a need to construct a culture theory that links self and societal processes.     

Individual differences for sex differences in achievement attributions?

Past research has found a self-defensive bias in males and a self-derogatory bias in female achievement attributions. Dispositional explanations for these differences were examined in the present study. Subjects completed measures of Need for Achievement, Self-Esteem, Fear of Success, Attitudes Toward Women, and Androgyny. They later competed in same- or mixed-sex pairs on an anagram task which was prearranged in difficulty so that one subject clearly defeated his/her partner. Consistent with past research, males were more likely to attribute their outcomes to ability, and less likely to attribute their outcomes to effort and luck, than were females. Achievement motivation was the most consistently successful predictor of these sex differences.     

Parenting and children's aggression: are there differences in the influence of the father and the mother?

Child rearing provides messages and rules that mediate the children's personality. These messages have a positive or negative influence on their behaviour. The objective of this empirical study was to analyse the relationship between physical and verbal aggression of sons and daughters and parenting style practiced by the father and the mother. The sample consisted of 2,788 students, aged 10 to 15 years, studying either the third cycle of Primary Education (44%) or the first cycle of Secondary Education (56%). Of them, 1,412 were boys (50.6%) and 1,375 were girls (49.3%). The results show that children's aggressiveness is more related to factors associated with the mother's parenting. In the case of daughters, the influence of parenting factors are caused by both parents (father and mother).     

Why are there sex differences in risky driving? the relationship between sex and gender‐role on aggressive driving,traffic offences,and accident involvement among young turkish drivers

The aim of this study was to investigate how sex (male and female) and gender‐role (masculinity and femininity) and their interaction were associated with risky driving behaviors, traffic offences, and accident involvement among young Turkish drivers. Three‐hundred and fifty‐four young drivers (221 males and 133 females) filled in a form including the short form of Bem Sex‐Role Inventory (BSRI), the Driver Behaviour Questionnaire (DBQ), questions about a driver's accident history, and background information. The effects were tested on outcome variables by using hierarchical regression analysis. It was found that sex (being male) predicted only the ordinary violations. While masculinity score predicted positively the number of offences, and aggressive and ordinary (highway code) violations, femininity score predicted negatively the number of accidents and offences, aggressive and ordinary violations, and errors. The effect of interaction between masculinity and femininity was only found on the number of accidents and aggressive violations among young drivers. There was no significant interaction effect between sex and gender roles on criterion variables. Aggr. Behav. 00:1–12, 2005. © 2005 Wiley‐Liss, Inc.     

Speeded verbal responding in adults who stutter: are there deficits in linguistic encoding?

Linguistic encoding deficits in people who stutter (PWS, n=18) were investigated using auditory priming during picture naming and word vs. non-word comparisons during choice and simple verbal reaction time (RT) tasks. During picture naming, PWS did not differ significantly from normally fluent speakers (n=18) in the magnitude of inhibition of RT from semantically related primes and the magnitude of facilitation from phonologically related primes. PWS also did not differ from controls in the degree to which words were faster than non-words during choice RT, although PWS were slower overall than controls. Simple RT showed no difference between groups, or between words and non-words, suggesting differences in speech initiation time do not explain the choice RT results. The findings are consistent with PWS not being deficient in the time course of lexical activation and selection, phonological encoding, and phonetic encoding. Potential deficits underlying slow choice RTs outside of linguistic encoding are discussed. EDUCATIONAL OBJECTIVES: The reader will be able to (1) describe possible relationships between linguistic encoding processes and speech motor control difficulties in people who stutter; (2) explain the role of lexical priming tasks during speech production in evaluating the efficiency of linguistic encoding; (3) describe the different levels of processing that may be involved in slow verbal responding by people who stutter, and identify which levels could be involved based on the findings of the present study.     

Assumptions of infantile amnesia: are there differences between early and later memories?

Most adults are able to provide few, if any, reports of autobiographical memories from the first years of life. Early memories that do exist have been characterised as highly emotional, containing an abundance of perceptual as opposed to propositional information, and more often in the third than the first person perspective. These qualities figure prominently in theories of the source of the phenomenon of infantile amnesia. However, early and later memories have not been directly compared with regard to these features. In the present research, we compared early and later memories in the same individuals, with the same methodology. Results indicated few objective differences between the early and later memories of women (Experiment 1) and men (Experiment 2). The findings are discussed in light of their implications for theories as to the source of infantile amnesia.     

Empathizing and systemizing: What are they,and what do they contribute to our understanding of psychological sex differences?

Empathizing and systemizing have recently been put forward as two important individual‐difference dimensions, whose different mean levels in men and women are argued to account for many psychological sex differences. This paper presents a series of studies designed to investigate the reliability and validity of the empathizing and systemizing quotients (EQ & SQ), to relate them to existing personality constructs, and to replicate reported sex and sexual orientation‐related differences. Correlations with interests and social behaviour suggest the two measures are valid. However, empathizing appears essentially equivalent to agreeableness in the five‐factor model of personality. Systemizing cannot be reduced to established personality dimensions, though it is moderately correlated with conscientiousness and openness. Men have higher levels of systemizing than women, and non‐heterosexual women higher than heterosexuals. However, no differences were found between heterosexual and non‐heterosexual men. Although systemizing and empathizing account for a number of observed sex differences, there are others they do not explain.     

Language in autism and specific language impairment: where are the links?

It has been suggested that language impairment in autism is behaviorally, neurobiologically, and etiologically related to specific language impairment (SLI). In this article, the authors review evidence at each level and argue that the vast majority of data does not support the view that language impairment in autism can be explained in terms of comorbid SLI. The authors make recommendations for how this debate might be resolved and suggest a shift in research focus. They recommend that researchers concentrate on those aspects of language impairment that predominate in each disorder rather than on those comparatively small areas of potential overlap.     

Selective attention and inhibitory deficits in ADHD: Does subtype or comorbidity modulate negative priming effects?

Selective attention has durable consequences for behavior and neural activation. Negative priming (NP) effects are assumed to reflect a critical inhibitory component of selective attention. The performance of adolescents with Attention Deficit/Hyperactivity Disorder (ADHD) was assessed across two conceptually based NP tasks within a selective attention procedure. Comorbidity (non-comorbid ADHD vs. comorbid ADHD) and subtype (ADHD combined vs. ADHD inattentive) were considered key issues. Results found NP effects to differ as a function of comorbidity but not subtype. Findings are discussed in light of functional neuroimaging evidence for neuronal enhancement for unattended stimuli relative to attended stimuli that strongly complements an inhibitory-based explanation for NP. Implications for the ‘AD’ in ADHD and contemporary process models of the disorder are considered.     

Are there developmental differences in reality-monitoring?

The question addressed by the present experiment is whether the ability to distinguish between veridical and imaginal memory representations changes with age. Second-grade, fourth-grade, and sixth grade children (8, 10, and 12 years old) and college students were shown pictures of familiar objects. Each picture was presented one, two, or three times and, interspersed with these presentations, subjects were asked to imagine each picture zero, one, or three times. Subsequently they were asked to judge the presentation frequency of each picture. For all groups, imagining the pictures resulted in inflated estimates of event frequency. However, contrary to the idea that children have a particularly difficult time discriminating externally generated from internally generated memories, one analysis indicated adults were actually somewhat more affected than children by the imagination trials.     

Are there gender differences in cognitive reflection? Invariance and differences related to mathematics

ABSTRACT

Cognitive reflection is recognized as an important skill, which is necessary for making advantageous decisions. Even though gender differences in the Cognitive Reflection test (CRT) appear to be robust across multiple studies, little research has examined the source of the gender gap in performance. In Study 1, we tested the invariance of the scale across genders. In Study 2, we investigated the role of math anxiety, mathematical reasoning, and gender in CRT performance. The results attested the measurement equivalence of the Cognitive Reflection Test – Long (CRT- L), when administered to male and female students. Additionally, the results of the mediation analysis showed an indirect effect of gender on CRT-L performance through mathematical reasoning and math anxiety. The direct effect of gender was no longer statistically significant after accounting for the other variables. The current findings suggest that cognitive reflection is affected by numerical skills and related feelings.     

Differential visual field-interhemispheric transfer: can it explain sex and handedness differences in lateralization?

104 men and women were tested for visual field-hemispheric transfer of spatial information on a dot-localization task. Right-handed subjects showed significant improvement when stimuli were presented to the left visual field of the right hemisphere (LVF-RH) after practice on the same task presented to the right visual field of the left hemisphere (RVF-LH) first. No improvement was found when the task was presented in the reverse order (LVF-RH first followed by RVF-LH). It was concluded that, for right-handers, transfer of spatial information to the right hemisphere is facilitated while transfer to the left hemisphere is inhibited. Left-handed subjects demonstrated no significant improvement in either condition, suggesting inhibition or lack of transfer of spatial information in either direction. No sex differences were found in either right-handed or left-handed subjects. The findings suggest that there may be different mechanisms underlying the similarities in functional lateralization of women and left-handers.     

Training effects on dual-task performance: are there age-related differences in plasticity of attentional control?

A number of studies have suggested that attentional control skills required to perform 2 tasks concurrently become impaired with age (A. A. Hartley, 1992; J. M. McDowd & R. J. Shaw, 2000). A. A. Hartley (2001) recently observed that the age-related differences in dual-task performance were larger when the 2 tasks required similar motor responses. The present study examined the extent to which age-related deficits in dual-task performance or time sharing--in particular, dual-task performance of 2 discrimination tasks with similar motor requirements--can be moderated by training. The results indicate that, even when the 2 tasks required similar motor responses, both older and younger adults could learn to perform the tasks faster and more accurately. Moreover, the improvement in performance generalized to new task combinations involving new stimuli. Therefore, it appears that training can substantially improve dual-task processing skills in older adults.     

Are there gender differences in verbal and visuospatial working-memory resources?

Whereas women generally outperform men in episodic-memory tasks, little is known as to how the genders compare with respect to basic working-memory operations. In reference to Baddeley's (1986) model, the present study searched for possible gender differences in terms of accuracy (but not speed) of working-memory processes. Men and women completed series of working-memory tasks respectively involving verbal and visuospatial information, as well as a double-span task involving both classes of information. Control measures included verbal fluency and mental rotation tasks in which gender differences are frequently obtained. In these tasks, the results showed several of the expected gender contrasts. However, men and women were not found to differ significantly in any type of working memory save in the double-span task where women surpassed men. The patterns of task intercorrelation were largely similar in both genders. Discussion emphasises the manifestation, based on the present exploration, of an almost identical working-memory architecture in men and women.     

Do sex differences in construction behavior relate to differences in physical cognitive abilities?

Animal Cognition - Nest-building behaviour in birds may be particularly relevant to investigating the evolution of physical cognition, as nest building engages cognitive mechanisms for the use and...     

Are there age-related differences in learning to optimize speed, accuracy, and energy expenditure?

Studies of age-related differences in manual aiming have indicated that older adults take longer to complete their movements than their younger counterparts because they tend to rely on time-consuming feedback-based control processes. Many authors have suggested that the reliance on feedback is the result of a "play-it-safe" strategy that has been adopted to compensate for a deterioration in accurate and consistent force generation. That is, perhaps because older adults know that their motor systems are not as reliable as the systems were at a younger age, they plan shorter movements that conserve time and space for feedback control to correct their programmed actions. The vast majority of the previous studies that have revealed these age-related differences in aiming, however, have used computer-based tasks that involve the transformation of perceptual into motor space. In the present experiment, older and younger adults completed real aiming movements over three sessions. The results suggest that, when acting in a real environment, the main difference between older and younger adults in movement execution lies in the efficient use of response-related feedback, not in the programming of movement.     

Who cares about ecology? Personality and sex differences in environmental concern1

This study was designed to identify personality factors that underlie concern for ecological-environmental problems. High and low environmental-concern individuals were given the California Psychological Inventory and were found to differ significantly on many subscales. A factor analysis of the CPI data produced four factors which closely paralleled previous CPI research findings. In conjunction with this analysis, four factorially derived scores were obtained for each individual. Comparison of high and low environmental-concern individuals' factorially derived scores showed high environmental-concern persons as having stronger value orientation, person orientation, and ethical-conscientiousness, but not differing from low environmental-concern individuals in terms of independence of thought or action. Further, high environmental-concern females were found to be significantly more extraverted, “leader-types” than low environmental-concern females; while the opposite relation was obtained for males. Thus, it appears that men and women become involved with the environmental movement for different reasons. Finally, additional implications of the involvement of basic psychological individual differences in determining ecological-environmental concern were discussed.