Baddeley et al's dual task study (1973)- found that participants found it harder to do 2 visual tasks at the same time compared to doing 1 visual and 1 verbal task at the same time.
Case studies
K.F- Brain damage he could not process verbal info but could process visual info.
Case studies- limitation
Lack generalisability
Practical applications
US air forces use it to measure suitability and memorycapacity of their pilots.
Supporting evidence
Brain scans- shows different areas of the brain are active when performing different types of tasks. For example, left temporal lobe when doing a spatial task.
Model being incomplete
People can listen to instrumental music while doing other auditory tasks without imparting their performance.
Central executive
Their is a lack of clarity as it it's function is vauge and different to test.
Extra evaluation points of the central executive
It may be divided in separate sub-components, links with attention research, there is evidence to support the central executive
Hunt (1980) evidence to support the central executive
Found that participants could perform twotasks together if they had practiced one of the tasks.