When navigating, women typically focus on landmarks within the environment, whereas men tend to focus on the Euclidean properties of the environment. However, it is unclear whether these observed differences in navigational skill result from disparate strategies or disparate ability. To remove this confound, the present study required participants to follow either landmark-or Euclidean-based instructions during a navigation task (either in the real-world or on paper). Men performed best when using Euclidean information, whereas women performed best when using landmark information, suggesting a dimorphic capacity to use these 2 types of spatial information. Further, a significant correlation was observed between the mental rotation task and the ability to use Euclidean information, but not the ability to use landmark information.

The current study assessed the construct validity of the Drive for Muscularity Scale (DMS; D. R.McCreary & D. K. Sasse, 2000) using both lower and higher order exploratory factor analysis (EFA). In a sample of male and female high school and college students, lower order EFAs showed that a 2-factor structure emerged for men (muscularity attitudes and behaviors), but not for women, although 11 of the 15 items overlapped across gender. A higher order EFA using the male 2-factor structure revealed the presence of a single, higher order DMS factor in both genders. It is argued that the overall DMS score can be used in samples of both men and women. However, the attitude and behavioral DMS subscales can be used validly only in men.

Hippocampal lesions impair spatial learning in the watermaze. Drugs that antagonize N-methyl-D-aspartate (NMDA)-receptor activity, which is required for long-term potentiation (LTP) at various hippocampal synapses, block LTP and impair watermaze learning. This has led to the hypothesis that NMDA receptors, through their involvement in LTP, may be necessary for spatial and other forms of learning. We examined this hypothesis using NPC17742 (2R,4R,5S-2-amino-4,5-(1,2-cyclo hexyl)-7-phosphonoheptano acid), a potent and specific antagonist of NMDA receptors. Here we report that NPC17742 completely blocked dentate gyrus LTP but did not prevent normal spatial learning in rats that had been made familiar with the general task requirements by non-spatial pretraining. Although these results do not rule out a contribution of NMDA-mediated dentate LTP to spatial learning, they indicate that this form of LTP is not required for normal spatial learning in the watermaze.

Prior qualitative research has suggested that people assume muscular men are more masculine. This assumption was tested quantitatively in 2 studies. In Study 1, men and women completed measures of gender-role traits and behaviors, whereas in Study 2, men completed measures of gender-role conflict and traditional attitudes about men. Study 1 revealed a correlation between self-rated male-typed traits and behaviors, with a need to be more muscular for both men and women. In Study 2, men with more traditional attitudes about men also wanted to be more muscular; men who wanted to be more muscular were experiencing conflict with regard to society's expectations that they be successful, powerful, and competitive, and they reported that finding a balance between work and leisure is difficult.

A detailed behavioral analysis of water-maze acquisition showed that the N-methyl-D-aspartate (NMDA) antagonist NPC17742 and the muscarinic antagonist scopolamine caused sensorimotor disturbances in behaviors required for maze performances and that these correlated with acquisition impairments in both hidden and visible platform versions of the maze in male rats. Behavioral disturbances included thigmotaxic swimming, swimming over and deflecting off the platform, abnormal swim behavior, and hyperactivity. Rats familiar with the behavioral strategies involved in the task performed normally under NPC17742 or scopolamine. The results indicated that drug-induced sensorimotor disturbances contributed to poor acquisition scores in naive rats. NMDA or muscarinic activity may contribute to but do not appear to be essential for spatial learning in the water maze.