In vertebrates, adaptation to new environments involves cardiorespiratory adjustments, especially when faced with an aversive one. In order to understand the mechanisms that control these phenomena, we have developed a procedure for aversive stimulation and chronic recording of cardiac activity in the Rhinella arenarum toad.The subjects were implanted with electrodes secured with clips and exposed to the presentation of NaCl solutions in an inescapable compartment, while the heart rate was recorded on a PC with a polygraph. I train them once a day for 12 sessions. First 6 sessions of Acquisition and then 6 of Extinction. During the acquisition, a 300 mM NaCl saline solution (neutral) was presented, followed by an 800 mM NaCl solution (aversive) which generated a large increase in heart rateWith the succession of Acquisition tests, this reactivity was registered upon presentation of the neutral solution, showing an anticipatory tachycardia to the aversive event. During extinction, the aversive solution was replaced by a neutral one, which led to the disappearance of this anticipatory cardiovascular response.These results would indicate a physiological adjustment of the cardiovascular system mediated by a learned response, probably part of an adaptive system to cope with threatening situations.

Fil: Daneri, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias Biológicas y Biomédicas del Sur. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Instituto de Ciencias Biológicas y Biomédicas del Sur; Argentina

Fil: Calleja, Nicolas Gustavo. Universidad de Buenos Aires. Facultad de Psicología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina

Fil: Muzio, Ruben Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina. Universidad de Buenos Aires. Facultad de Psicología; Argentina

Fil: Cervino, Claudio Osvaldo. Universidad de Morón. Facultad de Ciencias Exactas, Químicas y Naturales; Argentina

Fil: Cogo, Jorge. Universidad de Morón. Facultad de Ciencias Exactas, Químicas y Naturales; Argentina

Max Planck Institute for Human Cognitive and Brain Sciences

8th MindBrainBody Symposium

Alemania