History and Etymology for reflex Noun Latin reflexus , past participle of reflectere to reflect Adjective Latin reflexus.
Learn More about reflex. Time Traveler for reflex The first known use of reflex was in See more words from the same year. Dictionary Entries near reflex reflectorize reflesher reflet reflex reflex arc reflex camera reflexed See More Nearby Entries. More Definitions for reflex. English Language Learners Definition of reflex. Kids Definition of reflex. Newborn babies have a number of other reflexes which are not seen in adults, referred to as primitive reflexes. These automatic reactions to stimuli enable infants to respond to the environment before any learning has taken place.
They include:. Many of these reflexes are quite complex requiring a number of synapses in a number of different nuclei in the CNS e. Others of these involve just a couple of synapses to function e. Processes such as breathing , digestion , and the maintenance of the heartbeat can also be regarded as reflex actions, according to some definitions of the term. In medicine , reflexes are often used to assess the health of the nervous system.
Doctors will typically grade the activity of a reflex on a scale from 0 to 4. Naively, we might imagine that reflexes are immutable. In reality, however, most reflexes are flexible and can be substantially modified to match the requirements of the behavior in both vertebrates and invertebrates. A good example of reflex modulation is the stretch reflex. Derived forms of reflex reflexible , adjective reflexibility , noun.
Word Origin for reflex C from Latin reflexus bent back, from reflectere to reflect. An involuntary physiological response to a stimulus. An unlearned or instinctive response to a stimulus. Something, such as light or heat, that is reflected. Being an involuntary action or response, such as a sneeze, blink, or hiccup. Bent, turned, or thrown back; reflected.
To cause to undergo a reflex process. Hardware Hardware. Community Hub. A simple puzzle game. Simple graphics and nice music. They are waiting for you.
All Reviews:. Easy game. Game for people. Popular user-defined tags for this product:. Sign in or Open in Steam. Includes Steam Achievements. Knee-jerk reflex , also called patellar reflex , sudden kicking movement of the lower leg in response to a sharp tap on the patellar tendon, which lies just below the kneecap. One of the several positions that a subject may take for the test is to sit with knees bent and with one leg crossed over the other so that the upper foot hangs clear of the floor.
The sharp tap on the tendon slightly stretches the quadriceps, the complex of muscles at the front of the upper leg. In reaction these muscles contract, and the contraction tends to straighten the leg in a kicking motion.More generally, a reflex is the known derivative of an earlier form, which may be either attested or reconstructed. Reflexes of the same source are cognates. Methods. First, languages that are thought to have arisen from a common proto-language must meet certain criteria in order to be grouped together; this is a process called subgrouping.