Who? Shallice and Warrington - KF, poor STM ability for auditory information but normal processing of visual information; Phonological loop damaged but visuo-spatial sketchpad not
Why? Supports separatevisual and acoustic stores
Counterpoint: Clinical evidence
What? Unclear if KF had other cognitive impairments
Who? Trauma may have affected his cognitive performance
Why? Challenges evidence - brain injuries may have affected many different systems
Strength: Dual-task performance
What? Studies of dual-task performance support separate existence of visuo-spatial sketchpad
Who? Baddeley - Visual and verbal task, performance similar VS Both tasks visual, performance declines (Both visual tasks compete for same subsystem)
Why? Shows separate subsystem for visual and verbalprocessing
Limitation: Nature of central executive
What? Lack of clarity over nature of CE
Who? Baddeley - Needs to be more clearly specified than just being 'attention' (May consist of separate subcomponents)