Synonyms and related words :
action and reaction, answer, automatic reaction, automatic writing, automatism, autonomic reaction, blind impulse, bounceback, compulsiveness, conditioning, echo, echolalia, echopraxia, impulse, instinct, instinctiveness, involuntariness, predictable response, reaction, reflection, reflex, refluence, reflux, reply, respondence, response, retroaction, return, reverberation, revulsion, rise, sheer chemistry, unthinking response, unwilledness