Animals animal metabolism physiology AMIGDALA AMYGDALA APPETITIVE LEARNING APRENDIZAJE AVERSIVO APRENDIZAJE DEL APETITIVO AVERSIVE LEARNING CONSOLIDACION CONSOLIDATION EVITACION INHIBITORIA HIPOCAMPO HIPPOCAMPUS INHIBITORY AVOIDANCE LONG-TERM MEMORY MEMORIA A LARGO TERMINO NF-KAPPA B NMDA NUCLEO ACCUMBENS NUCLEUS ACCUMBENS PSD-95 Synapses long term memory memory consolidation nerve cell plasticity nonhuman synapse Andronov-Hopf bifurcation