extinction

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extinction

 [eks-ting´shun]
in psychology, the disappearance of a conditioned response as a result of its not being reinforced; also, the process by which the disappearance is accomplished. See also conditioning.

ex·tinc·tion

(eks-tingk'shŭn),
1. In behavior modification or in classical or operant conditioning, a progressive decrease in the frequency of a response that is not positively reinforced; the withdrawal of reinforcers known to maintain an undesirable behavior.
2. Synonym(s): absorbance
[L. extinguo, to quench]

extinction

/ex·tinc·tion/ (eks-tink´shun) in psychology, the disappearance of a conditioned response as a result of nonreinforcement; also, the process by which the disappearance is accomplished.

extinction

(ĭk-stĭngk′shən)
n.
1.
a. The act of extinguishing: The extinction of the fire took several hours.
b. The condition of being extinguished: mourned the extinction of her dreams.
2. The fact of being extinct or the process of becoming extinct: the extinction of the passenger pigeon; languages that are in danger of extinction.
3. Psychology A reduction or a loss in the strength or rate of a conditioned response when the unconditioned stimulus or reinforcement is withheld.
4. Physiology A gradual decrease in the excitability of a nerve to a previously adequate stimulus, usually resulting in total loss of excitability.

extinction

[iksting′shən]
a state of being lost or destroyed.

extinction

Psychiatry A facet of operant–classical conditioning, in which the conditioned response is weakened and eventually disappears by nonreinforcement. See Operant conditioning, Respondent conditioning, Sensory extinction.

ex·tinc·tion

(eks-tingk'shŭn)
1. In behavior modification or classical or operant conditioning, a progressive decrease in the frequency of a response that is not positively reinforced.
See: conditioning
2. Synonym(s): absorbance.
[L. extinguo, to quench]

extinction

  1. the act of making EXTINCT or the state of being extinct.
  2. the elimination of an allele of a gene in a population, due to RANDOM GENETIC DRIFT or to adverse SELECTION pressures.
  3. any periodical, catastrophic event resulting in a species or larger taxonomic group dying out abruptly at a particular point in geological history. Such extinctions are thought to be cyclical, occurring every 28.4 million years, and have been attributed to cosmic activity such as showers of large asteroids or comets, though neither the periodicity nor its causes are at present universally accepted.

extinction

the disappearance of a conditioned response as a result of nonreinforcement.
References in periodicals archive ?
When asked about the possibility of obtaining DNA of extinct animals like the woolly mammoth in order to clone it, Carroll said, "Yes, I think we'll be able to get much, if not all, of the woolly mammoth DNA.
Replicas of eggs from living and extinct animals are available for comparison.
A panther was recently spotted in the area so the students are pretty pumped to try to spot one of these nearly extinct animals.
Following the birth of the first ever hyena cubs in the wild in the UAE, this is yet another success for Sir Bani Yas Island in protecting and re-introducing previously extinct animals.
The 10-night program includes two extra nights in Puerto Natales with private escorted tours of majestic Torres Del Paine National Park and Milodon Cave, where in 1895 the remains of extinct animals such as the Sabre Tooth Tiger and the Milodon (giant sloths) were found.
Right now, it looks like a treasure trove of data to help us sort out the relationship in time between humans and extinct animals in the Greater Antilles.
The Cambridge-educated academic, who has been at the World Museum for almost 35 years, said the damage done by sunlight to DNA was the reason why exhibits of extinct animals are not on display in Liverpool.
Buckland, who had by this time already established the presence of extinct animals at Kirkdale Cave, Yorkshire and the Goat's Hole cave at Paviland, Gower (Buckland 1823) was quick to recognise the palaeontological significance of this new site and following his own (and others') brief explorations encouraged another interested cleric, the Rev.
A British scholar of natural history, Piper profiles extinct animals within in chronological sections, first during the past century, then two, then five.
Find lesson plans, lists of extinct animals, and more at the Illinois State Museum's Web site about the extinctions of the Late Pleistocene era: www.
Although the great ape still lived in the forests of west Africa, it was expected to be gone by the time scientists develop the ability to bring extinct animals back from the dead.
Scientists say that before long, they could be able to clone extinct animals that have been frozen.