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PubMed1983

Recovery of masculine copulatory behavior from lesions of the medial preoptic area: effects of age versus hormonal state.

The present experiments tested the hypothesis that one consequence of the hormonal activation of the onset of copulation in male rats is a reduction in the plasticity of the medial preoptic area (MPOA) with respect to its role in copulation. In Experiment 1, one group of male rats received 1 mg of testosterone propionate daily from 10 to 45 days of age, and a second group received oil injections. Males in each of these groups received either bilateral MPOA lesions (MPOAX) or a sham operation as juveniles (28-31 days of age). The proportions of MPOAX males copulating as adults did not differ for males previously injected with oil or testosterone. In Experiment 2, male rats were castrated at 15 days of age. These castrated males as well as gonadally intact males received bilateral MPOA lesions or a sham operation in adulthood. Following testosterone replacement, MPOAX males displayed copulatory impairments regardless of hormonal state during development. Taken together, the results of these experiments suggest that the plasticity (with respect to copulation) of the neural system encompassing the MPOA is a function of some aspect of chronological age unrelated to the animal's developmental hormonal condition prior to the time of the lesion.

Age Factors↗
PubMed2003

The dynamics of masculine-agentic and feminine-communal traits: findings from a prospective study.

A reciprocal impact hypothesis posits an influence of gender-related traits (agency and communion) on role enactment and a reciprocal impact of role enactment on gender-related traits, for both men and women. Specifically, in this study it was predicted that agency influences career success and career success influences agency. In addition, the reciprocal influence of communion and family roles was examined. A prospective study with almost 2000 university graduates, who were tested after graduation and 1.5 years later, clearly supported the reciprocal impact hypothesis for agency and career success. Communion influenced family roles, but there was no reciprocal influence. Implications for theories of career success and of sex and gender are discussed.

Adult↗