title: Effects of early postnatal gonadal steroids on acquisition and extinction of a single alternation response in discrete-trials lever pressing.
abstract: The present report studies the effect of sex on the acquisition and extinction of a single alternation schedule of reinforced (R) and nonreinforced (N) trials in a Skinner box. In addition to the investigation of the basic sex differences in Experiment 1, the effects of early gonadal steroids treatment and postpubertal gonadectomy of male and female rats were examined in Experiments 2 and 3, respectively. Both acquisition and extinction performances were evaluated by means of latency. In Experiment 1, males showed higher latencies on N trials and extinguished faster than female rats. In Experiment 2, female androgenization and male orchidectomy on day one after birth reversed the direction of the sex differences found in the previous experiment. However, postpubertal gonadectomy (Experiment 3) does not affect the performance of male and female rats.
authors.affiliation: Departmento de Psicobiología, Universidad Nacional de Educación a Distancia, Spain.
authors.forename: J M
authors.initials: JM
authors.lastname: Calés
authors.forename: S
authors.initials: S
authors.lastname: Segovia
authors.forename: P
authors.initials: P
authors.lastname: Enríquez
authors.forename: A
authors.initials: A
authors.lastname: Guillamón
mesh_terms: D000818:Animals; D004193:Discrimination Learning / Q000502:physiology*; D005108:Extinction, Psychological / Q000502:physiology*; D005260:Female; D012739:Gonadal Steroid Hormones / Q000494:pharmacology / Q000502:physiology*; D008297:Male; D009919:Orchiectomy; D010052:Ovariectomy; D051381:Rats; D011919:Rats, Inbred Strains; D012054:Reinforcement, Psychology; D012737:Sex Factors
chemical_list: D012739:Gonadal Steroid Hormones