SEX-HORMONE INFLUENCES ON YAWNING BEHAVIOR

  • 1 January 1980
    • journal article
    • research article
    • Vol. 40  (2) , 515-519
Abstract
Young male albino rats yawn significantly more than females or castrated males when injected with physostigmine (0.10 mg/kg). Treatment with testosterone (100 .mu.g daily) during 7 days restores cholinomimetically induced yawning in castrated males, and increases yawning in normal and androgenized females. Treatment with estradiol (200 .mu.g daily) during 1 wk does not modify physostigmine induced yawning behavior in castrated males nor in androgenized females.