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Sex hormone influences on yawning behavior
Acta Neurobiologiae Experimentalis
|January 1, 1980
Summary
Testosterone influences yawning behavior in rats. Male rats yawn more, and testosterone treatment restores yawning in castrated males and increases it in females, while estradiol has no effect.
Area of Science:
- Neuroendocrinology
- Behavioral Neuroscience
- Pharmacology
Background:
- Yawning is a complex behavior influenced by various neurochemical pathways.
- Sex hormones, particularly androgens and estrogens, are known modulators of physiological and behavioral processes.
Purpose of the Study:
- To investigate the role of sex hormones in physostigmine-induced yawning in rats.
- To determine the effects of testosterone and estradiol on yawning behavior in different sex and castration conditions.
Main Methods:
- Physostigmine (0.10 mg/kg) was administered to young male, female, and castrated male albino rats.
- Hormone treatments included daily testosterone (100 micrograms) or estradiol (200 micrograms) for seven days.
- Yawning frequency was quantified and compared across treatment groups.
Main Results:
- Young male rats exhibited significantly higher yawning frequencies compared to females and castrated males post-physostigmine injection.
- Testosterone administration restored physostigmine-induced yawning in castrated males.
- Testosterone treatment increased yawning in normal and androgenized females, whereas estradiol had no significant effect on yawning in castrated males or androgenized females.
Conclusions:
- Testosterone plays a crucial role in modulating physostigmine-induced yawning behavior in rats.
- Androgenic influence on yawning is sex-dependent and can be restored by exogenous testosterone administration.
- Estrogen does not appear to significantly influence physostigmine-induced yawning in this experimental model.