Schematic of fear-induced behavioural arrest pathways. Much of the amygdala circuitry is omitted for simplicity. ACx, auditory cortex; BLA, basolateral amygdala; CeL, centrolateral nucleus of the amygdala; CeM, centromedial nucleus of the amygdala; Mc, magnocellular nucleus; MLR, mesencephalic locomotor region; mPFC, medial prefrontal cortex; PRF, pontine reticular formation.