Case studies: KF had brain damage and could only remember 2 auditory digits but visual memory worked normally in STM
Paulesu et al. (1993): Used PET scan, Broca’s area activated during subvocal rehearsal task to remember words and supramarginal gyrus active when phonological store was used; supports idea phonological store and articulatory rehearsal system are separate things within the phonological loop slave system
Lab experiments show participants struggle with simultaneous verbal and visual tasks, aiding in identifying deficits in their WM and strategies to overcome these Baddeley
Baddeley and Hitch (1976): Dual-Task Procedure: Completed two tasks simultaneously using the same or different memory stores; tasks involved tracking a moving light on a screen whilst imagining the letter F, performance was not impaired when performing one visual task and a verbal task simultaneously, as the visuospatial sketchpad was used for one task and the phonological loop for the other