Abstract
Working memory consists of central executive and two subsystems, namely phonological (articulatory) loop and visuospatial sketchpad. Phonological loop is a concept developed from the verbal short-term memory of modal model. Phonological loop is further subdivided into phonological short-term store, phonological output buffer, and loop itself connecting the two components. From the results of digit span in aphasic patients, the author assume the left superior temporal gyrus as a candidate for the anatomical substrate of phonological short-term store. The phonological loop is assumed to extend over the left inferior parietal lobule. Phonological output buffer may be located in the left primary motor cortex. Further evidences are needed in both normal subjects (PET activation study or functional MRI) and brain damaged patients, and these two lines of findings must be integrated.
