Keywords: هیپوکامپ پشت و شکمی; Emotion; Fear; Anxiety; Posttraumatic stress disorder; Behaviour; Metaplasticity; Oscillations; Delta; Gamma; Theta; Sharp-wave ripple; Dorsal and ventral hippocampus; Amygdala; Medial prefrontal cortex; Long-term memory; Engram; Ensemble formation;