Earlier models of working memory specified two short-term memory components to actively store and maintain visual and phonological information (Baddeley, 1986) and a central executive (Baddeley, 1996) to co-ordinate and process information between the two short-term memory stores as well as long-term memory. Baddeley (2000) introduced the concept of the episodic buffer to explain the transfer and integration of information between the three original components of working memory and long-term memory. The question asks you to evaluate the empirical evidence from the tasks that have been used to substantiate the different aspects of the model. Since this extension to the model was introduced some time ago and evaluation of more recent research would be appropriate, particularly in relation to language learning and literacy.
Key reference: Baddeley, A. (2000). The episodic buffer: a new component of working memory? Trends in Cognitive Sciences, 4, 417-423.
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