The phrase "automatic impulse" refers to an action or response that happens without conscious thought or deliberation. Synonyms for this term include "reflex," "instinctive reaction," "involuntary movement," and "unconscious response." These words all suggest a lack of conscious control or decision-making in the behavior or reaction being described. Other similar phrases include "knee-jerk reaction," "reflex action," and "spontaneous reflex." These terms are often used to describe physical reactions, such as flinching in response to a loud noise, but they can also apply to more abstract behaviors or emotional responses.