The current study addressed the issue of working memory (WM) impairment in relapsing-remitting multiple sclerosis (RRMS) patients, employing the definition of WM based on Alan Baddeleyâs model in cognitive psychology. Built on previous existing models of short-term memory, this structural model proposed the existence of two subsystems that are dependent upon a third attentionally limited control component, the central executive. According to Baddeley, the phonological loop subsystem deals with verbal and acoustic information while the visuospatial sketchpad processes visual and spatial material. More recently, a fourth subsystem, the episodic buffer, has been added and is suggested to relate WM with long-term memory by integrating information from multiple sources. The phonological loop has, itself, been divided into two subcomponents : the phonological store and the articulatory rehearsal system. The former is a temporary storage system that holds memory traces over a matter of seconds while the latter is responsible for refreshing memory traces that would otherwise disappear at the end of the few seconds delay. This articulatory rehearsal system is held to involve a subvocal rehearsal component, which not only maintains the information within the store, but also permits the transfer of visual information to the phonological store, provided the items can be named .
Last date updated on July, 2014