The area of cognitive research that has produced the most consistent sex differences is the area of spatial ability. Particularly, males usually perform better on mental rotation tasks than do females. One argument for these differences is that experience with spatial activity drives these differences, such that traditionally more masculine activities require more practice of spatial abilities. Another argument is biological in nature, such that there is either 1) a critical period of development that leads to differential lateralization of the brain, or 2) differential activation of the brain by circulating hormones. Performance on mental rotation tasks has been associated with right parietal activation levels, both during task performance and prior to performance during baseline recordings. The present study examined the relations among sex, age, EEG hemispheric activation (at the 10.5-13.5Hz. frequency band), and 2-dimensional mental rotation task ability. Nineteen eight-year-olds (10 boys) and 20 college students (10 men), had EEG recorded at baseline and while performing a mental rotation task. Men performed better on the mental rotation task than women, while there were no differences between boys and girls. After covarying for baseline EEG high alpha power values, EEG results during the mental rotation task indicated an interaction, with men exhibiting more activation (lower EEG power values at 10.5-13.5Hz) than women in the parietal and posterior temporal regions, while boys' and girls' power values 10.5-13.5Hz did not differ in the parietal or posterior temporal regions. Furthermore, during the baseline condition, men generally exhibited more activation (lower EEG power values at 10.5-13.5Hz) throughout all regions of the scalp. Results support the hypothesis that hormones, or hormonal influence, may result in a biological change which affects both brain activation and performance on mental rotation tasks. / Master of Science

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Thesis (MA (Psychology))--University of Stellenbosch, 2005. / The primary aim of this study was to determine the content and number of fears expressed by 1st year students at a tertiary institution both retrospectively and currently. The expressed retrospective profile aimed to determine the content and number of fears recalled by the sample group when they were six years old. The expressed current profile aimed to determine the content and number of fears currently being experienced. The study also aimed to establish whether there were significant gender differences in the two profiles. This study found that there were no significant differences between males and females in terms of content or number of expressed fears for the retrospective profile. Both groups indicated the most reported fears for Dark/Night, followed by fears of People and Animals, although in different rank orders. The fears were of a specific nature as the five highest ranked categories accounted for almost 70% of the fears expressed. In addition, the actual fear profile of pre-school children as found by Loxton (2004) was compared to the retrospective fear profile as the sample group recalled it. This study confirmed Loxton’s findings as the three highest ranked categories of the retrospective expressed profile covered the five highest ranked categories in the actual profile. This study found that males and females shared four of the five most common ranked fears for the current expressed profile, namely Failure, Harm to Others, Animals and Future. This study did not confirm the expected decline in animal fears as predicted by the literature, but the other fears would appear to comply with the body of research for the content of the late adolescents’ expressed fears. These fears were more diverse in nature and the ten highest ranked categories accounted for about 70% of the fears expressed. Statistically significant gender differences were found in terms of Dark/Night, Being Alone, Violence/Crime, Separation and Relational Problems. The expected decline in the number of expressed fears was not confirmed as the average number of fears per participant increased slightly from the retrospective profile to the current profile. There was no significant difference with regard to gender. The secondary aim of this study was to establish whether any of the expressed fears have remained constant from the retrospective profile to the current profile. The fear of Animals appeared to be one fear that, rather than decline with age, remained stable. Other fears that appeared to show continuity were related to Harm to Self and Harm to Others. Fear of Being Alone appeared in both the retrospective and current expressed profiles for females only. A fear that was indicated in the literature to be relevant at the late adolescent stage of development was the fear of Acquired Immune Deficiency Syndrome. This study found no evidence to support these predictions, which is a thought-provoking problem. Although beyond the scope of this study, the implications of this apparent lack of fear for a life-threatening problem of epidemic proportions particularly for this age group, is of concern.

Thesis (MSc)--Stellenbosch University, 2001. / AFRIKAANSE OPSOMMING: Die primêre doel van die huidige studie was om kruis-kulturele verskille ten opsigte van direkte en indirekte aggressie tussen Xhosa, Zulu, Kleurling en Blanke Suid-Afrikaanse studente te bestudeer. 'n Totaal van 832 studente het die Richardson Conflict Response Questionnaire (RCRQ), 'n vraelys wat direkte en indirekte aggressie meet, voltooi. Die Kleurling-deelnemers het beduidend-hoër vlakke van direkte aggressie gerapporteer as enige van die ander groepe. Die Zulu-deelnemers het beduidend-hoër vlakke van indirekte aggressie as beide die Xhosa- of Kleurling-deelnemers gerapporteer. Geen beduidende geslagsverskille kon vasgestel word nie. Daar is tot die slotsom gekom dat kultuur 'n groter bepaler van verskille ten opsigte van aggressiewe gedrag was as geslag van die deelnemers. Daar word vertrou dat die resultate van die huidige studie 'n bydra sal maak tot die effektiewe bestuur van aggressie in Suid-Afrika, asook tot die bevordering van internasionale begrip vir die kulturele diversiteit van die land. / ENGLISH ABSTRACT : The primary aim of the present study was to examine cross-cultural differences in direct and indirect aggression between Xhosa, Zulu, Coloured and White South African students. A total of 832 students completed the Richardson Conflict Response Questionnaire (RCRQ), a measure of direct and indirect aggression. The Coloured participants reported using significantly higher levels of direct aggression than any of the other cultural groups involved. The Zulu participants reported using significantly more indirect aggression than their Xhosa or Coloured counterparts. No significant gender differences could be established. It was concluded that culture was more predictive of differences in aggressive behaviour than was sex of the participants. It is hoped that these results may contribute towards the effective management of aggression in South Africa and assist in promoting international understanding of the cultural diversity in this country.

The literature surrounding individual trade policy preference has traditionally relied on economic self-interest as the impetus for opinion formation. However, every survey-based study has observed a significant and baffling gender bias, with women being consistently more likely to oppose international trade than their male counterparts. One explanation for this phenomenon focuses on the specialized, economic training required to understand the complex subject of international trade. This study uses a unique sample of undergraduate students from Ball State University, stratified by academic department. The survey instrument is aimed at comparing departments that emphasize economic training with those that do not and how this effects the individuals trade policy preferences. The results show that controlling for economic training eliminates the significance of gender in predicting trade policy preference. / Department of Sociology

Mate preferences provide an opportunity to explore the validity of evolutionary and social role origin theories of sex differences in human behaviour. In evolutionary models, preferences are sex-specific adaptive responses to constraints to reproductive success. In social role models, sex differences arise from the allocation of men and women to different gender roles. I explored the effects of the status of women on preferences to assess the validity of the origin theories. I developed an adequate measure of female status (i.e. resource control), and explored its effects on female preferences in an online survey (Chapter 3), a mail-shot survey (Chapter 4), and a sample of non-industrial societies (Chapter 5). Results implicated a role of constraints on women in the expression of female-typical preferences. In an experimental manipulation of female perceptions of their status, results enabled greater confidence in the attribution of causal direction to relationships (Chapter 6). In Chapter 7, I explored the conditions under which the relationships of interest occurred. In Chapter 8, to further explore the origin models I investigated the effects of resource control on the magnitudes of sex differences in preferences. In Chapter 9, I explored relationships between a characteristic more closely related to the male gender role (i.e. apparent intelligence) and femininity in female faces. Women who were considered to look more intelligent were perceived as less feminine. In Chapter 10, I investigated the effects of reproductive strategy on mate preferences. Results were consistent with evolutionary models of behaviour. I argue that “status” is a multidimensional construct, and that its effects on mate preferences are complex, that while results were generally more consistent with an evolutionary than the biosocial model, integration of models would provide greater insight into human mate preferences.

In both the private and work spheres, multitasking among three or more activities has become and is continuing to evolve as a pervasive element of everyday life, and recent technological advances only seem to be exacerbating the process. Despite attempts to understand the mental processes that let humans successfully multitask, little is known about the functional cognitive level at which these mental processes take place. This thesis makes a case for the involvement of spatial ability (among other cognitive abilities) in successful multitasking behavior. It focuses on the importance of the cognitive off-loading of executive control demands onto spatial ability, due to the inherent complexity of relationships between task goals and deadlines in multitasking scenarios. Importantly, it presents a working hypothesis—the spatiotemporal hypothesis of multitasking—as a tool for making specific predictions about multitasking performance, based on individual and sex differences in spatial ability. In Study 1, individual differences in spatial ability and executive functions emerged as independent predictors of multitasking performance. When spatial ability was decomposed into its subcomponents, only the coordinate (metric), but not categorical (nonmetric), processing of spatial relations was related to multitasking performance. Males outperformed females in both spatial ability and multitasking, and the effects were moderated by menstrual changes, in that sex differences in coordinate spatial processing and multitasking were observed between males and females in the luteal phase of the menstrual cycle, but not between males and females at menses. In Study II, multitasking performance reflected age- and sex-related differences in executive functioning and spatial ability, suggesting that executive functions contribute to multitasking performance across the adult life span, and that reliance on spatial skills for coordinating deadlines is reduced with advancing age. The results of Study III, in which the spatiotemporal hypothesis was directly scrutinized, suggest that the spatial disruption of multiple deadlines interferes with multitasking performance. Overall, these findings suggest that multitasking performance, under certain conditions, reflects independent contributions of spatial ability and executive functioning. Moreover, the results support the distinction between categorical and coordinate spatial processing, suggesting that these two basic relational processes are selectively affected by female sex hormones and are differentially effective, even across the age span, in transforming and handling temporal patterns as spatial relations in the context of multitasking. Finally, fluctuations of sex hormones exhibit a modulating effect on sex differences in spatial ability and multitasking performance. / <p>At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Manuscript.</p>

Schizophrenia is a debilitating psychiatric condition affecting almost one percent of the US population. Typical antipsychotics (e.g., haloperidol) have been in use for several decades and are generally very effective in treating the emotional and cognitive effects of schizophrenia, but are used as the last line of treatment due to their severe extrapyramidal motor side effects under chronic exposure. The present study was conducted to investigate the role of sex in determining the oromotor side effects of typical antipsychotics via measuring different behavioral dimensions of male and female Sprague-Dawley rats licking sucrose after haloperidol treatment. The results showed a stronger sensitivity in female rats than male rats within total licking responses and inter-lick intervals. The present results suggest closer attention needs to be paid to the role that sexual hormones play in the motor slowing and behavior-reducing effects of antipsychotics.

This study was conducted to examine the experience of unwanted sexual aggression from both the male and female perspectives. Questionnaires were distributed to 325 students, and of these, 142 wrote free-response narratives describing their most sexually aggressive experience. Two raters scored and analyzed the narratives on the basis of 19 categories for male responses and 16 categories for female responses. Differences between the male and female perception of the experience of unwanted sexual aggression were found on several categories. The results of this study suggest that date rape awareness and prevention programs should emphasize the point that dating and sexual encounters can easily be fraught with miscommunication and misinterpretation, and encourage clearer communication and better understanding.

The purpose of this study was to determine whether sex differences could be observed in computer use among preschool disadvantaged children. Each of the twenty-two three- and four-year-old children were administered the Bardwell- Sietsema Sex Stereotype Scale to obtain a measure of sex role identification. Subject's choice of a pre-programming or academic-oriented software program as well as actual time at the computer were also carefully recorded over a five week period. Data supports the following: there does not appear to be a relationship between sex role stereotyping and computer use among three and four year old disadvantaged children, stereotypical sex role identification exists between three and four year old disadvantaged children, the amount of time spent at the computer during free choice periods does not differ between boys and girls, and there is no difference between boys and girls in terms of choice of academic or pre-programming software.