Hormones and midbrain mediation of courtship behavior in the male ring dove (Streptopelia risoria)

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Investigated the possible role of the intercollicularis (ICo) region in the androgen-dependent courtship behavior of male ring doves. In Exp I, bilateral lesions in the ICo region reduced nest-cooing but did not specifically alter other courtship behavior of males tested with stimulus females. In Exp II, unilateral implants containing crystalline testosterone propionate (TP) or cholesterol (C) were placed in the ICo region or in other parts of the midbrain of castrated Ss. The TP implants activatad nest-cooing only when placed in the ICo region. Diffusion from the implant was probably not responsible for the elicitation of nest-cooing, since the weights of the peripheral steroid-sensitive tissues of Ss implanted with TP and C did not differ and since many sites near, but not in, the ICo region were ineffective. Data demonstrate the importance of the ICo region in the expression of courtship behavior in the male ring dove. The facilitation of certain vocal courtship behavior by hormonal stimulation is in line with the suggestion that the central gray/ICo/torus semicircularis regions of the vertebrate brain are analogous in their mediation of vocalizations. (58 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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