PubMed · 8085010
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B Olivier, J Mos, M Raghoebar, P de Koning, M Mak. 1994. Serenics.. https://doi.org/10.1007/978-3-0348-7153-2_6
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Studies of the distribution of mating success among males in frog choruses typically seek to identify specific phenotypic attributes that confer a higher mating success on certain individual males. These attributes invariably relate to competition among males: either direct competition in the form of aggression, or competition to attract and be chosen by females. In this paper, we present evidence that an additional factor may operate in frog choruses. We show that individual males who mate on a given night enjoy a higher probability of being successful on the next night, and we suggest that this is because successful mating enables males to conserve energy.
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BACKGROUND: Attention-deficit hyperactivity disorder (ADHD) is a developmental disorder whose three main symptoms are impulsiveness, inattention, and hyperactivity. Researchers have proposed that the central deficit in ADHD is one of poor response inhibition. The present studies were designed to look at the functioning of the hypothalamic-pituitary-adrenal (HPA) axis in response to mental stress in aggressive ADHD subjects participating in a longitudinal study of various psychosocial treatments. METHODS: Pretest and posttest morning salivary samples for cortisol determination were collected from subjects given a battery of tests. RESULTS: The study shows that ADHD subjects who maintained their diagnosis over the first year of the study had a blunted response to the stressor in comparison to those ADHD subjects who no longer retained the disorder 1 year later. CONCLUSIONS: The data suggest that an impaired response to stress may be a marker for the more developmentally persistent form of the disorder.