The Working memory reference article from the English Wikipedia on 24-Apr-2004
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Working memory

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Working memory, also called transient memory, is 1. Transient Store - Sensory Register (Atkinson & Shiffrin) · Visual (Iconic); Acoustic (Echoic); and Haptic (touch) · Up to 0.5 second · Sperling & Neisser demonstration (submitted by B.Kharel)