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• W1988144476 endingPage "179" @default.
• W1988144476 startingPage "169" @default.
• W1988144476 abstract "In vertebrates having sex chromosomes, sexual behavior is influenced by steroid hormones throughout life as well as by the cumulative experiences of the individual. Because males and females differ genetically as well as hormonally, it would be valuable to distinguish the contribution of sex-specific genes from hormones. In addition, since animals age s they gain sociosexual experience, but do not necessarily gain sociosexual experience as they age, it is important to separate the effects of age rom those attributable to experience. The leopard gecko is a lizard lackin sex chromosomes, depending instead upon the temperature during incubation to establish gonadal sex. This effectively removes sex-specific genetic influences from any study of sexual differentiation. Eggs were incubated at either 26°C or 32.5°C, temperatures that produce only female hatchlings or a male-biased sex ratio, respectively. By raising geckoes in isolation and then housing some animals together in breeding groups at different ages after they attained sexual maturity, it was possible to assess the relative effects of age and sociosexual experience on the volume and metabolic capacity of limbic and non-limbic brain areas. In general, males showed more changes compared to females. For example, there was a decrease with age in the volume of the preoptic area and the ventromedial hypothalamus in males, but not in females. Both age and sociosexual experience influenced cytochrome oxidase activity in these and other brain areas. Experienced animals had greater metabolic capacity in nuclei functionally associated with sociosexual behavior in lizards and other vertebrates. For example, cytochrome oxidase activity was higher in the anterior hypothalamus of males, in the ventromedial hypothalamus of both males and females from the male-biased incubation temperature, and in the preoptic area of females from both incubation temperatures. These differences were not paralleled by differences in circulating levels of sex hormones; only plasma androgen levels differed as a function of experience in males. These data suggest that the volume and metabolic capacity of specific brain regions change as animals age and gain sociosexual experience, but the nature and degree of change depend upon prenatal events." @default.
• W1988144476 created "2016-06-24" @default.
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• W1988144476 creator A5011542591 @default.
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• W1988144476 date "1997-05-01" @default.
• W1988144476 modified "2023-10-16" @default.
• W1988144476 title "Effects of age and sociosexual experience on the morphology and metabolic capacity of brain nuclei in the leopard gecko (Eublepharis macularius), a lizard with temperature-dependent sex determination" @default.
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• W1988144476 doi "https://doi.org/10.1016/s0006-8993(97)00222-9" @default.
• W1988144476 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9203546" @default.
• W1988144476 hasPublicationYear "1997" @default.
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