Contraction of the stapedius and tensor tympani muscles of the middle ear in response to an intense sound.
Involuntary movement. Response to a stimulus.
Movements that the body makes automatically in response to a specific cue.
movement performed automatically, involuntarily, in consequence of a nervous impulse
These are responses of part of the body to a stimulus that does not involve the higher brain centers. The blinking of the eye or knee jerk are examples of reflexes.