S: (n) Babinski, Babinski reflex, Babinski sign (extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons)
S: (n) yawn, yawning, oscitance, oscitancy (an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom) "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his oscitancy"
S: (n) electric shock, electrical shock, shock (a reflex response to the passage of electric current through the body) "subjects received a small electric shock when they made the wrong response"; "electricians get accustomed to occasional shocks"
S: (n) light reflex, pupillary reflex, miosis, myosis (reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller)
S: (n) mydriasis (reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs)
S: (n) micturition reflex (relaxation of the urethral sphincter in response to increased pressure in the bladder)
S: (n) pharyngeal reflex, gag reflex (normal reflex consisting of retching; may be produced by touching the soft palate in the back of the mouth)
S: (n) plantar reflex (flexion of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front in persons over the age of 2 years; under 2 years the results should be extension of the toes (Babinski reflex))
S: (n) rooting reflex (reflex consisting of head-turning and sucking movements elicited in a normal infant by gently stroking the side of the mouth or cheek)
S: (n) startle response, startle reaction (a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions)
S: (n) startle reflex, Moro reflex (a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs)
S: (n) suckling reflex (reflex behavior in newborn mammals; includes finding and grasping the nipple in the mouth and sucking on it and swallowing the milk)
S: (n) hiccup, hiccough, singultus ((usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion) "how do you cure the hiccups?"