Sex differences in spontaneous alternation and open-field behavior of hamsters: Habituation differences

With a minimal intratrial interval, male golden hamsters spontaneously alternated significantly less often in a T-maze than females. Since there was no sex difference in choice latencies, the alternation difference could not be accounted for by longer intertrial intervals experienced by males. Instead, the difference was ascribed to faster rates of habituation to novelty in females because they showed greater between-sessions declines in open-field ambulation than males. From an analysis of rearing scores it was concluded that attempts to escape from the apparatus may have been the principal motivating influence in both the T-maze and open field.     

Sex differences in discrimination reversal learning in the guppy

In several mammalian and avian species, females show a higher performance than males in tasks requiring cognitive flexibility such as the discrimination reversal learning. A recent study showed that female guppies are twice as efficient as males in a reversal learning task involving yellow–red discrimination, suggesting a higher cognitive flexibility in female guppies. However, the possibility exists that the superior performance exhibited by females does not reflect a general sex difference in cognitive abilities, but instead, is confined to colour discrimination tasks. To address this issue, we compared male and female guppies in two different discrimination reversal learning tasks and we performed a meta-analysis of these experiments and the previous one involving colour discrimination. In the first experiment of this study, guppies were tested in a task requiring them to learn to select the correct arm of a T-maze in order to rejoin a group of conspecifics. In experiment 2, guppies were observed in a numerical task requiring them to discriminate between 5 and 10 dots in order to obtain a food reward. Although females outperformed males in one condition of the T-maze, we did not find any clear evidence of females’ greater reversal learning performance in either experiment. However, the meta-analysis of the three experiments supported the hypothesis of females’ greater reversal learning ability. Our data do not completely exclude the idea that female guppies have a generally higher cognitive flexibility than males; however, they suggest that the size of this sex difference might depend on the task.     

Spatial visualization and sex differences in quantitative ability

The hypothesis that sex differences in spatial visualization ability might account for sex differences in mathematical ability was supported for a group of 183 male and 81 female college students. With spatial visualization statistically controlled, no significant sex differences in Quantitative Scholastic Aptitude Test (QSAT) scores was found; including sex as a predictor variable increased the variance explained by less than 1%. Although the slope of the regression of mathematics on spatial visualization did not differ as a function of sex, males were somewhat more predictable than females. As the OSAT of both males and females high on spatial visualization was more predictable than the QSAT of those scoring less well, it appears that the sex difference in predictability is due to males having higher spatial ability than females.     

Sex differences in identity status

In this study, sex differences in the Identity Status Interview (ISI) developed by Marcia (1980) were examined. The ISI was administered to 151 college students, 75 female and 76 male. It was found that status in the Ideology domain is most predictive of Identity Status for males, while status in the Sexual-Interpersonal domain is most predictive for females. No sex difference was found for the Occupation domain. An additional finding was that females rated the Sexual-Interpersonal domain as more important to their identity than did males. These results are interpreted as supporting the view that issues of interpersonal function are uniquely relevant to female identity development.     

Male-female differences in sexual fantasy

A questionnaire about thoughts and ideas during sexual activity was returned by 51 females and 50 males in a random sample of college undergraduates. A high response rate (91%) and the similar sexual experience of male and female respondents make possible a strong conclusion about the college population sampled: Males are thinking more about past experiences and current behavior, while females are thinking more of imaginary experiences. This difference occurs for thoughts during masturbation as well as for thoughts during heterosexual activity. It appears that females prefer a different kind of sexual fantasy than males, rather than being generally less interested in sexual fantasy as claimed by Kinsey, Pomeroy, Martin, and Gebhart (Sexual behavior in the human female, Philadelphia: Saunders, 1953).     

Sex differences in duration judgments: A meta-analytic review

We quantitatively reviewed human sex differences in the magnitude and variability of duration judgments. Data from 4,794 females and 4,688 males yielded 87 effect size estimates of magnitude and 28 of variability. The overall sex difference in duration judgment magnitude was small but statistically significant. It was moderated by whether study participants knew in advance (prospective paradigm) or only later (retrospective paradigm) that they would be required to judge duration. Although prospective judgments showed no overall sex effect, some levels of moderator variables showed a small but statistically significant effect. Retrospective judgments showed a larger subjective-to-objective duration ratio for females than for males, and several variables moderated this effect. Females' judgments also showed more intersubject variability than did males' judgments. Relative to males, females sustain attention to time more in the prospective paradigm and have better episodic memory in the retrospective paradigm.     

Rat strain differences in copulatory behavior after para-chlorophenylalanine and hormone treatment.

The potentiation of masculine copulatory behavior in castrated male rats following systemic para-chlorophenylalanine (PCPA) treatment was found to be dependent upon the strain of rat and the recency of castration. Wistar (W) and Sprague-Dawley (SD) males displayed a decline in behavioral responsiveness to PCPA treatment following castration, the W males retaining their behavioral responsiveness longer than SD males. Castrated W males were also behaviorally more responsive to androgen replacement than were SD males. Ovariectomized W and SD females receiving estrogen replacement displayed a strain difference in hormonal sensitivity. In tests for feminine copulatory behavior, ovariectomized W females were behaviorally more sensitive to estrogen treatment than SD females. Ovariectomized and estrogen-primed females of both strains displayed potentiated lordotic behavior following chronic PCPA treatment. Concomitant treatment with dexamethasone to reduce adrenal steroid output abolished the potentiation of lordotic behavior found with PCPA treatment.     

Sex differences in fetal habituation

There is some evidence for sex differences in habituation in the human fetus, but it is unknown whether this is due to differences in central processing (habituation) or in more peripheral processes, sensory or motor, involved in the response. This study examined whether the sex of the fetus influenced auditory habituation at 33 weeks of gestation, and whether this was due to differences in habituation or in the sensory or motor components using a set of four experiments. The first experiment found that female fetuses required significantly fewer stimulus presentations to habituate than males. The second experiment revealed no difference in the spontaneous motor behaviour of male and female fetuses. The third experiment examined auditory intensity thresholds for the stimuli used to habituate the fetus. No differences in thresholds were found between males and females, although there was inter-individual variability in thresholds. A final experiment, using stimuli individualized for that particular fetus' auditory intensity threshold, found that female fetuses habituated faster than males. In combination, the studies reveal that habituation in the human fetus is affected by sex and this is due to a difference in central 'information processing' of the stimuli rather than peripheral aspects of the response. It is argued that male and female fetuses present different neurobehavioural developmental trajectories, with females more advanced at 33 weeks than males. This study suggests that research examining prenatal behaviour should consider the factor of fetal sex. This may be particularly pertinent where there is an intention to use the results diagnostically.     

The effects of feedback on the gender differences in the performance in a chronometric mental-rotation test

ABSTRACT

Gender differences favouring males are often found in mental-rotation tests and are usually smaller in chronometric than in psychometric test. The individual feedback in the chronometric test could be an explanation for the comparable performance of males and females. To test this hypothesis, 102 undergraduate students (60 females, 42 males) participated in a chronometric mental-rotation study with or without feedback. A subsample of 41 participants was asked to report their confidence about their performance in the test. In reaction time, males outperformed females and participants in the feedback condition reacted faster than participants without feedback. A significant interaction of gender and condition was found. Only females had an advantage in the feedback condition in reaction time while there was no difference for males. Males reported higher scores of confidence. Feedback seemed to help females especially to react faster. Confidence levels are discussed as reasons for differences between conditions and genders.     

Sex-related differences in socio-political ideology

The study was directed towards uncovering differences in socio-political ideology between males and females. The subjects consisted of 532 Swedish high school students from metropolitan Stockholm. All subjects were from the same grade and of approximately the same age (18 years). The results failed to disclose any significant differences in the political party preference of males and females. However, there were a number of statistically significant differences in the socio-political attitudes of males and females as measured by the S5 Conservatism Scale. Females were found to be less generally conservative, less racist, pro-western, punitive and more religious and egalitarian than males. Despite certain ideological differences between males and females, the socio-political attitude profiles and the attitude structures, as measured by profile and factor analyses, were quite similar for males and females. The results are discussed in terms of four schools of thought concerning the sources of sex-related differences in political style.     

Sex differences in assertive achievement patterns

Observations in mathematics and social studies classrooms were made of 40 sixth-grade children of average and high ability to investigate whether males and females differ in assertive achievement behavior. The prediction of less assertive achievement behavior for females than males was supported only among average-ability children. Particularly in social studies, average-ability females participated less in the classroom than average-ability males and either high-ability males or females. Average-ability females' deficit of assertive behavior became more pronounced as the behavior category increased in degree of assertiveness. High-ability females demonstrated a deficit only in the most assertive behavior category.     

Sex differences in attributions for sex-typed tasks1

Recent studies have indicated that males make more egotistical attributions than females, that is, males make more internal attributions for success and more external attributions for failure than females do. These sex differences in attributions were examined in terms of male/female differences in expectancies for success and ego-involvement in the tasks. Male and female subjects succeeded or failed on a masculine or a feminine task. It was found that males made more egotistical attributions than females on the masculine task, but females made more egotistical attributions than males on the feminine task. A covariance analysis revealed that these sex differences in attributions could be explained in terms of the differences between the males and females in expectancy for success and in ego-involvement. Finally, it was found that ego-involvement was a more important determinant of egotisical attributions in the present study than was expectancy.     

Sex differences in the adolescent brain

Adolescence is a time of increased divergence between males and females in physical characteristics, behavior, and risk for psychopathology. Here we will review data regarding sex differences in brain structure and function during this period of the lifespan. The most consistent sex difference in brain morphometry is the 9–12% larger brain size that has been reported in males. Individual brain regions that have most consistently been reported as different in males and females include the basal ganglia, hippocampus, and amygdala. Diffusion tensor imaging and magnetization transfer imaging studies have also shown sex differences in white matter development during adolescence. Functional imaging studies have shown different patterns of activation without differences in performance, suggesting male and female brains may use slightly different strategies for achieving similar cognitive abilities. Longitudinal studies have shown sex differences in the trajectory of brain development, with females reaching peak values of brain volumes earlier than males. Although compelling, these sex differences are present as group averages and should not be taken as indicative of relative capacities of males or females.     

Sex differences in coping with depression

A Depression Coping Questionnaire (DCQ) was devised to compare strategies for coping with depression reported by male and female college students. Discriminant analysis showed that females were significantly more likely than males to report crying, eating, smoking cigarettes, becoming irritable, and confronting their feelings when depressed. Males were significantly more likely than females to report becoming aggressive and engaging in sexual behavior when depressed. Discriminant analysis data from students in Massachusetts showed significant cross-validation with discriminant analysis data from students in California. Comparison of depressed males and females indicated that depressed males reported behaviors of withdrawal such as spending time alone and using stimulating and tranquilizing drugs. Depressed females reported self-blame. Significant multiple correlations between DCQ questions and depression scores on the Beck Depression Inventory (BDI) showed that high BDI scores were associated with isolation and escape in males, and with self-blame and acting out in females. It is concluded that depressed females might benefit most from alleviation of self-blame and adaptive relabeling of depressive symptoms, and depressed males might benefit most from increased self-awareness and active coping.The authors are indebted to Colleen F. Surber, John R. Surber, and Frederick B. Meeker.     

Sex differences in the genetic and environmental influences on childhood conduct disorder and adult antisocial behavior

Sex differences in the genetic and environmental influences on childhood conduct disorder and adult antisocial behavior were examined in a large community sample of 6,383 adult male, female, and opposite-sex twins. Retrospective reports of childhood conduct disorder (prior to 18 years of age) were obtained when participants were approximately 30 years old, and lifetime reports of adult antisocial behavior (antisocial behavior after 17 years of age) were obtained 8 years later. Results revealed that either the genetic or the shared environmental factors influencing childhood conduct disorder differed for males and females (i.e., a qualitative sex difference), but by adulthood, these sex-specific influences on antisocial behavior were no longer apparent. Further, genetic and environmental influences accounted for proportionally the same amount of variance in antisocial behavior for males and females in childhood and adulthood (i.e., there were no quantitative sex differences). Additionally, the stability of antisocial behavior from childhood to adulthood was slightly greater for males than females. Though familial factors accounted for more of the stability of antisocial behavior for males than females, genetic factors accounted for the majority of the covariation between childhood conduct disorder and adult antisocial behavior for both sexes. The genetic influences on adult antisocial behavior overlapped completely with the genetic influences on childhood conduct disorder for both males and females. Implications for future twin and molecular genetic studies are discussed.     

Maternal employment,anxiety, and sex differences in college students' self-descriptions

This study sought to determine if a relationship exists between maternal employment during childhood, anxiety, and gender in college students. A questionnaire incorporating the Adjective Generation Technique (AGT) was administered to undergraduate psychology students from intact, two-parent families. Subjects were grouped into four categories: males whose mothers worked during their childhood (n=33), males whose mothers remained home (n=49), females whose mothers worked (n=54), and females whose mothers remained home (n=49). Data were analyzed using a 2×2 analysis of variance. Results indicated no differences in anxiety for subjects of either sex in relationship to the employment status of the mothers. A pronounced sex difference was found, with females scoring significantly higher in anxiety than males.     

Spontaneous alternation behavior in hamsters

Male and female golden hamsters spontaneously alternated successive entries of T-maze arms (derived from a + − maze) rather than body turns during a series of eight consecutive trials except when not confined to the arm chosen on each trial. Only unconfined males failed to alternate on their first opportunity. Confinement to an entered arm for 30 seconds had no effect on females but increased alternation in males. Increasing the visual discriminability of the arms had no effect on alternation in either sex. It was concluded that spontaneous alternation behavior in hamsters depended upon whether or not they were confined to a chosen arm and their sex. It is possible that the phenomenon was escape-related.     

Self-esteem and sexual behavior: Exploring gender differences

Previous studies have shown that the relationship between sexual permissiveness and self-esteem fluctuates with the social climate. The present study found that high self-esteem males and females had a significantly greater number of sexual partners than low self-esteem subjects. The relationship is particularly strong for males. The greatest difference in self-esteem levels was found between male virgins and nonvirgins. Self-esteem levels did not differ between female virgins and nonvirgins. Sensation seeking, marital status, and age were also found to be significantly related to number of coital partners.     

Personality differences between established and less-established male and female creative artists

Past research on personality constructs of creative individuals has focused on men rather than women and has neglected the essentially social aspect of being considered creative. Therefore, personality variables of 60 male and 60 female creative artists were described using the California Psychological Inventory (CPI). Male and female groups were further divided equally into two subgroups reflecting a difference in degree of social acceptance of their work. Relationships between the four groups were explored by multiple discriminant analysis. The major conclusion noted was that creative females tend to be more like their creative male counterparts, in terms of CPI scale variation, than are males and females in general.     

Sex differences in recipients' reactions to aid

The purpose of this study was to determine whether males and females differentially respond to the receipt of aid as a function of their similarity to the donor and their own chronic level of self-esteem. Female and male adults received either help from a fictitious partner or no aid. All subjects were given information that they had been paired with a partner who had an inferior, similar, or superior level of task-relevant experience. Females paired with a partner of equal experience reported greater decrements in situational self-esteem than did males. Furthermore, females who received help reported a higher level of satisfaction with the help, and in all but one of the similarity conditions, females expressed a greater need for help than did males. When self-esteem was considered, high self-esteem females paired with persons with similar experience exhibited greater decrements in mood than did other high self-esteem females; males did not differ across conditions. Implications of the obtained sex differences were discussed in relation to sex differences in help-seeking behavior and sex role stereotypes.The authors would like to express their gratitude to Rob Beller, Mary Greenspun, Cheryl Hepfel, and Andrea Nagel, who assisted in data collection, and to Sanford Braver, who assisted with analyses. Thanks are also extended to Paul Karoly, Clark Presson, and Manuel Barrera for their advice throughout the completion of this study. The study was completed as partial fulfillment for the requirements of a master's degree by the first author at Arizona State University.