Depression of postejaculatory ultrasonic vocalization by (+)-bicuculline |
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| Authors: | A Fernández-Guasti K Larsson J Vega-Sanabria |
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| Institution: | 1. Department of Psychology, University of Göteborg, Box 14158, S-400 20 Göteborg Sweden;2. Departamento de Farmacologia y Toxicologia, CINVESTAV. Ap. Postal 22026 México 14000, D.F. México;1. Servicio de Neurocirugía, Hospital Universitario Ramón y Cajal, Madrid, Spain;2. Servicio de Neurocirugía, Hospital Universitario La Princesa, Madrid, Spain;3. Servicio de Neurocirugía, Instituto de Medicina y Cirugía Barcelona, Barcelona, Spain;4. Servicio de Neurofisiología Clínica, Hospital Universitario Ramón y Cajal, Madrid, Spain;5. Servicio de Neurocirugía, Hospital Central de la Defensa Gómez Ulla, Madrid, Spain;6. Servicio de Diagnóstico por Imagen, Hospital Universitario Ramón y Cajal, Madrid, Spain |
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| Abstract: | The male rat emits ultrasonic (22 kHz) vocalizations after ejaculation and behavioural and electrophysiological evidence suggests that this vocalization reflects an inhibitory state underlying and determining the postejaculatory refractory period (PEI). Present results show that injection into the preoptic-anterior hypothalamic area of (+)-bicuculline methiodide, a GABA antagonist, shortens the PEI and reduces ultrasonic vocalization. It is suggested that the suppression of ultrasonic vocalization following bicuculline treatment reflects a depression of an inhibitory state normally produced by ejaculation. |
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