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memory span
In psychology and neuroscience, memory span is the longest list of items that a person can repeat back in correct order immediately after presentation on 50% of all trials. Items may include words, numbers, or letters. The task is known as ''digit span'' when numbers are used. Memory span is a common measure of short-term memory. It is also a component of cognitive ability tests such as the WAIS. Backward memory span is a more challenging variation which involves recalling items in reverse order.
==Memory span as functional aspect==
Functionally, memory span appears to measure the number of discrete units over which the individual can successively distribute his attention and still organize them into a working unit. To generalize, memory span refers to the ability of an individual to reproduce immediately, after one presentation, a series of discrete stimuli in their original order. Practically any sort of material may be presented, such as digits, letters, words, and sounds, and almost any sense organ or combination of sense organs may be used to receive the impressions.〔Albert B. Blankenship(1938). The psychological bulletin, Vol. 35, No. 1, 2-3.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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