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Working Memory Model
Baddeley and Hitch (1974) proposed the working Memory model (WM) as an attempt to describe a more accurate model of short-term Memory than Atkinson & Shiffrin's 'multi-store' Memory model (1968).
Baddeley and Hitch argued that short term Memory should be represented in terms of a set of separate stores which handle different modalities, such as sound and visual data, rather than as a single store as in the multi-store model.
Working Memory consists of a central executive which is in overall charge and is modality free, a phonological loop (verbal material) and a visuo-spatial sketchpad (visual memories).
The phonological loop is also subdivided into a phonological store (speech perception) and an articulatory process (speech production).
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More recently, Baddeley (2000) has added a fourth component to the model, called the 'episodic buffer'. This component is a third storage system, dedicated to linking information across domains to form integrated units of visual, spatial, and verbal information (e.g., the Memory of a story or a movie scene).
