Assuntos
Leucina Encefalina-2-Alanina/análogos & derivados , Encefalina Leucina/análogos & derivados , Gânglios Simpáticos/fisiologia , Coração/inervação , Músculos/inervação , Regeneração Nervosa/efeitos dos fármacos , Animais , Encefalina Leucina/farmacologia , Masculino , Denervação Muscular , Ratos , Ratos EndogâmicosRESUMO
25-minute testing of aggressive reactions in constant pairs of male rats, elicited by electric shocks shows that electro-pain aggression of rats is not a homogeneous process, but consists of three successive stages: orienting-investigatory activity and attempts to get out of the chamber; defensive aggression; establishing of relations of domination-subordination and attacking aggression. Division in attacking rats and defending themselves, occurs mainly at final stages of testing (15-25 min); in some pairs reactions of attacking aggression are accomplished by the same rats. It is supposed that rats pain aggression is not a purely defensive form of this behaviour, but a modification of intermale aggression caused by specificity of laboratory conditions.