unconditioned reflex

/ˈʌnkənˌdɪʃənd ˌriˈflɛks/

Definitions of unconditioned reflex

1. noun

   an automatic instinctive unlearned reaction to a stimulus
   synonyms: inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response

   types:

   accommodation reflex

   reflex changes in the eyes that enable an object to be focused on the retina

   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

   belch, belching, burp, burping, eructation

   a reflex that expels gas noisily from the stomach through the mouth

   blink, blinking, eye blink, nictation, nictitation, wink, winking

   a reflex that closes and opens the eyes rapidly

   blush, flush

   sudden reddening of the face (as from embarrassment or guilt or shame or modesty)

   disgorgement, emesis, regurgitation, vomit, vomiting

   the reflex act of ejecting the contents of the stomach through the mouth

   defecation reflex, rectal reflex

   normal response to the presence of feces in the rectum

   oscitance, oscitancy, yawn, yawning

   an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom

   electric shock, electrical shock, shock

   a reflex response to the passage of electric current through the body

   gulp, gulping

   a spasmodic reflex of the throat made as if in swallowing

   knee jerk, knee-jerk reflex, patellar reflex

   a reflex extension of the leg resulting from a sharp tap on the patellar tendon

   light reflex, miosis, myosis, pupillary reflex

   reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller

   mydriasis

   reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs

   micturition reflex

   relaxation of the urethral sphincter in response to increased pressure in the bladder

   gag reflex, pharyngeal reflex

   normal reflex consisting of retching; may be produced by touching the soft palate in the back of the mouth

   goose bump, goose pimple, goose skin, goosebump, gooseflesh, horripilation, pilomotor reflex

   reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation

   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)

   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

   jump, start, startle

   a sudden involuntary movement

   myotactic reflex, stretch reflex

   reflex contraction of a muscle when an attached tendon is pulled; important in maintaining erect posture

   suckling reflex

   reflex behavior in newborn mammals; includes finding and grasping the nipple in the mouth and sucking on it and swallowing the milk

   shake, shiver, tremble

   a reflex motion caused by cold or fear or excitement

   sneeze, sneezing, sternutation

   a symptom consisting of the involuntary expulsion of air from the nose

   hiccough, hiccup, 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

   rumination

   regurgitation of small amounts of food; seen in some infants after feeding

   haematemesis, hematemesis

   vomiting blood

   hyperemesis

   severe and excessive vomiting

   pandiculation

   yawning and stretching (as when first waking up)

   startle reaction, startle response

   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

   Moro reflex, startle reflex

   a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs

   flinch, wince

   a reflex response to sudden pain

   palpebration

   repeated blinking or winking (especially if uncontrolled and persistent)

   type of:

   reaction, response

   a bodily process occurring due to the effect of some antecedent stimulus or agent