Bigger isn't always better: an exploration of social perception bias against high levels of muscularity in women.

Bodybuilding is often considered more appropriate for men than for women. Previous research has shown that knowledge of a target's involvement in bodybuilding influences interpersonal judgments. The present study examined whether this is also the case for women with competitive-type bodybuilder physiques. Participants (N = 263) were shown photographs of women who competed professionally in different categories of bodybuilding (i.e., bikini, figure, and bodybuilding/physique). Participants were then asked to make a series of judgments on the basis of the photos alone. It was found that the degree of muscularity of the targets shaped participants' estimates of perceived outcomes and of the targets' traits in non-bodybuilding domains (e.g., expected positive life outcomes, gender role traits, and sexual orientation). Both men and women apparently considered moderate to high levels of muscularity in women targets as violations of gender norms.

Romantic and Sexual Relationships with Adult Partners Among Pedohebephilic Men.

This study examined reasons for romantic and sexual relationships with adult partners among men with pedohebephilic preferences (N = 125). We also explored whether age sexual orientation impacted reasons for engaging in sex with adult partners. Pedohebephilic men endorsed both non-sexual and sexual reasons for engaging in adult-partnered relationships. The top reasons for sexual relationships with adult partners were pleasure, love and commitment, physical desirability, experience seeking, and practicality. The top reasons for romantic relationships with adult partners were to gain companionship, love toward romantic partner, to escape loneliness, to engage in sexual activities, and it seemed natural. The exclusivity of attraction to children was found to be significantly related to some of the factors. These findings support differential reasons for pedophilic men engaging in adult-partnered relationships. Professionals should seek to understand the nature of their clients' relationships and age sexual orientation to determine whether such factors are relevant. Professionals can then support clients in their search for meaningful relationships.

The Impact of Parenting Style on Attitudes toward Masturbation: A Latent Profile Analysis.

Parents play a vital role in the development of their children's sexual attitudes and behaviors; however, little is known about the impact of parenting on masturbation attitudes. The present study aimed to explore the role of discussions with parents about attitudes toward masturbation. Additionally, latent profile analysis (LPA) was used to determine whether subgroups of exposure to distinct parenting styles exist, and if so, the extent to which they are related to the formation of masturbation attitudes. A convenience sample of 279 university students aged 18-21 completed an anonymous self-report survey. Participants who had not discussed masturbation with their parents reported significantly more negative attitudes than those who had discussed it. In general, participants who perceived their parents to be high in both rejection and control reported more negative attitudes toward masturbation than participants whose parents were lower in rejection and lower in control. The LPA revealed three parenting profiles that were differentially related to young adults' masturbation attitudes: Permissive Parenting, Typical Parenting, and Authoritarian Parenting. An exploratory analysis found that female participants endorsed fewer negative attitudes toward masturbation than their male counterparts. Bayesian statistics were used to improve the interpretation of the data, allow for more meaningful and accurate conclusions, and provide converging evidence with the null hypothesis significance testing results. Implications and limitations are discussed within the context of current masturbation and parenting style research.

An evaluation of the relationship between body image and sexual avoidance.

This study examined the relationship between body image and sexual avoidance. Of particular interest was whether this relationship was mediated by other variables. Participants were 362 undergraduate students who responded to a battery of questionnaires pertaining to three aspects of body image, sexually avoidant behavior, and three mediator variables, which included sexual esteem, sexual satisfaction, and sexual desire. Consistent with previous studies, a relationship between body image and sexual avoidance was found, indicating that those with a more negative body image displayed a greater tendency to avoid sexual activity. Furthermore, sexual esteem, sexual satisfaction, and sexual desire appeared to mediate this relationship. Implications of these results suggest that these mediator variables are important in the relationship between body image and sexual avoidance, and may be useful targets for those seeking treatment for sexual avoidance issues. Limitations of the study and avenues for future research are discussed.

Contrasting effects of motor and visual spatial learning tasks on dendritic arborization and spine density in rats.

Rats were trained in four different learning tasks including the Morris-water task, a T-maze delayed nonmatch-to-sample task, a skilled unilateral reaching task, and a skilled bilateral string-pulling task. At the end of training the brains were harvested and stained using a Golgi-Cox procedure. Learning the spatial navigation task produced increased dendritic length and branching as well as decreased spine density in layer III pyramidal cells in occipital cortex. Learning the T-maze task increased dendritic branching in layer III medial but not orbital frontal cortex pyramidal cells and increased spine density in both regions. The motor learning tasks produced increased dendritic length and branching in layer V pyramidal cells in the forelimb cortex in the hemisphere contralateral to the trained limb in the unilateral skilled reaching task and in both limbs in the bilateral skilled pulling task. There were no changes in spine density in layer V in the motor tasks, but there was a decrease in spine density in layer III in the unilateral reaching task. Spatial and motor learning thus produce different patterns of change in layer III cortical pyramidal neurons. Furthermore, changes in spine density and dendritic length and branching are not tightly correlated and can increase and/or decrease independently of one another in learning tasks.

Therapeutic effects of complex rearing or bFGF after perinatal frontal lesions.

We investigated the effects of an enriched environment and/or basic fibroblast growth factor (bFGF) on recovery from neonatal frontal injury in rats. Rats received medial frontal lesions, or sham surgery, on postnatal day (P) 2/3. In the first set of experiments (Experiments 1 and 2), rats were housed in enriched environments that consisted of a large enclosure with multiple objects (or standard housing) for 90 days beginning at weaning (P22) or in adulthood (P110). In Experiment 3, the rats either received 7 days of subcutaneous bFGF beginning on the day after surgery or bFGF plus enriched housing beginning at weaning. After the 90-day housing period, the animals were tested on a spatial navigation task and a skilled reaching task. Early lesions of the medial frontal cortex caused severe impairments in spatial learning but this deficit was markedly reduced with enriched housing, bFGF, or a combination of both, with the latter being most effective. The housing effects varied with age, however: the earlier the experience began, the better the outcome. Enriched housing increased dendritic length in cortical pyramidal neurons, an effect that was greater in the lesion than the control animals, and enriched housing reversed the lesion-induced decrease in spine density. Enriched environment increased the thickness of the cortical mantle in both lesion and controls whereas bFGF had no effect. Experience thus can affect functional and anatomical outcome after early brain injury but the effects vary with age at experience and may be facilitated by treatment with bFGF.

Recovery from early cortical damage in rats. IX. Differential behavioral and anatomical effects of temporal cortex lesions at different ages of neural maturation.

Rats were given lesions of the temporal association cortex on postnatal day 4 or 10, or in adulthood. Ninety days later they were trained on two visual tasks (visual-spatial navigation; horizontal-vertical stripes discrimination). Lesion animals were compared behaviorally and neuroanatomically to littermate sham control rats. The day 4 lesions produced a larger deficit in the navigation task than day 10 or adult lesions. There were no deficits in the discrimination task. Analysis of the brains showed that the day 4 lesions produced a smaller brain and thinner cortex than day 10 lesions. The day 10 lesions produced hypertrophy in the dendritic arborization of pyramidal cells in parietal cortex. The results are consistent with the general findings that perinatal cortical injury in rats produces more severe behavioral and morphological effects than similar lesions in the second week of life and that cortical lesions around day 10 lead to an increase in cortical synaptogenesis.

Is there an optimal age for recovery from motor cortex lesions? II. behavioural and anatomical consequences of unilateral motor cortex lesions in perinatal, infant, and adult rats.

Purpose: The purpose of this study was to compare the behavioural and anatomical effects of unilateral motor cortex ablation in neonatal, infant, and adult rats. Methods: Rats were given unilateral lesions of the motor cortex on the day of birth (P1), at ten days of age (P10), or in adulthood. They were trained on several motor tasks (skilled forelimb reaching, beam traversing, tongue extension), general motor activity, and a test of spatial learning (Morris water task). Results: Although all lesion groups were equally impaired at skilled reaching with the forelimb contralateral to the lesion, rats with P1 lesions also were impaired at traversing a narrow beam and at learning the Morris task. Gross anatomical analyses revealed that the P1 rats had smaller brains than the other groups, a result that may account for the larger behavioural deficits in the P1 group. Analysis of Golgi-Cox stained neurons showed that relative to control groups, all lesion groups showed an increase in dendritic length in the basilar dendrites of layer III pyramidal cells and, paradoxically a decrease in length of the apical dendrites of the same cells. Conclusions: The bilateral alterations in dendritic organization following the motor cortex lesions suggest that there has been a bilateral reor-ganization of intrinsic cortical connectivity following motor cortex lesions at any age. These alterations in connectivity are likely not identical in the young and adult animals, however, because relative to controls, both the young operated groups, but not the adult group, showed a bilat-eral drop in spine density in the basilar dendrites of layer V pyramidal cells. These findings are discussed with respect to the idea that there may be critical ages in development in which animals can use anatomical modifications to compensate for deficits produced by cortical injury.