The episodic buffer: a new component of working memory?

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The episodic buffer: a new component of working memory? Alan Baddeley  Trends in Cognitive Sciences  Volume 4, Issue 11, Pages 417-423 (November 2000) DOI: 10.1016/S1364-6613(00)01538-2

Fig. 1 The current version of the multi-component working memory model. The episodic buffer is assumed to be capable of storing information in a multi-dimensional code. It thus provides a temporary interface between the slave systems (the phonological loop and the visuospatial sketchpad) and LTM. It is assumed to be controlled by the central executive, which is responsible for binding information from a number of sources into coherent episodes. Such episodes are assumed to be retrievable consciously. The buffer serves as a modelling space that is sep-arate from LTM, but which forms an important stage in long-term episodic learning. Shaded areas represent ‘crystallized’ cognitive systems capable of accumulating long-term knowledge, and unshaded areas represent ‘fluid’ capacities (such as attention and temporary storage), themselves unchanged by learning. Trends in Cognitive Sciences 2000 4, 417-423DOI: (10.1016/S1364-6613(00)01538-2)

Fig. I (a) The initial three-component model of working memory proposed by Baddeley and Hitch (Ref. b). The three-component model assumes an attentional controller, the central executive, aided by two subsidiary systems, the phonological loop, capable of holding speech-based information, and the visuospatial sketchpad, which performs a similar function for visual information. The two subsidiary systems themselves form active stores that are capable of combining information from sensory input, and from the central executive. Hence a memory trace in the phonological store might stem either from a direct auditory input, or from the subvocal articulation of a visually presented item such as a letter. (b) A further development of the WM model. It became clear that the phonological loop plays an important role in long-term phonological learning, in addition to short-term storage. As such it is associated with the development of vocabulary in children, and with the speed of acquisition of foreign language vocabulary in adults. The shaded areas represent ‘crystallized’ cognitive systems capable of accumulating long-term knowledge (e.g. language and semantic knowledge). Unshaded systems are assumed to be ‘fluid’ capacities, such as attention and temporary storage, and are themselves unchanged by learning, other than indirectly via the crystallized systems (Ref. i). Trends in Cognitive Sciences 2000 4, 417-423DOI: (10.1016/S1364-6613(00)01538-2)