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adaptation

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dark adaptation

dark adaptation  

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Overview Page
(dark)the changes that take place in the retina and pupil of the eye enabling vision in very dim light. See rod. Compare light adaptation.
Down syndrome

Down syndrome  

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A congenital form of mental retardation due to a chromosome defect in which there are three copies of chromosome no. 21 instead of the usual two (see trisomy). The affected individual has a short ...
light adaptation

light adaptation  

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Reflex changes in the eye to enable vision either in normal light after being in darkness or in very bright light after being in normal light. The pupil contracts (see pupillary reflex) and the ...
pain

pain  

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Severe physical or mental discomfort or distress. Pain of a physical origin arises through detection of noxious stimuli or tissue injury by specific sensory neurons in the affected part of the body, ...
Piagetian

Piagetian  

Of, relating to, or resembling the theory of cognitive development of the Swiss psychologist Jean Piaget (1896–1980). See accommodation (2), adaptation (3), animism (1), assimilation (2), centration, ...

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