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A strength of WMM is that the case of KF supports separate STM stores.
SHALLICE & WARRINGTON (1970): studied case of KF who had poor STM ability for verbal information but could process visual information normally.
THEREFORE, suggests separate visual and acoustic stores.
HOWEVER, evidence from brain-damaged patients may be unreliable.
A Strength is that dual task performance studies support the VSS.
BEDDELEY et al (1975): found participants had more difficulty doing two visual tasks than doing a visual and verbal task at the same time.
-both visual tasks compete for same limited resources
THEREFORE, dual task performance activity provides evidence for existence of VSS (MSM can't explain this).
A limitation of the WMM is a lack of clarity over the central executive,
COGNITIVE PSYCHOLOGISTS: suggests CE is unsatisfactory, should be more clearly specified that just 'attention'
THEREFORE, WMM hasn't been fully explained.
A strength is that the word length effect supports the phonological loop.
BADDELEY et al (1975): found people have mroe difficulty learning a long list of words than short words
- limited space in articulatory process for rehearsal
THEREFORE, word length disappears in a repetitive task, demonstrating process.
A strength is support from brain scanning studies.
BRAVER et al (1997): participants did tasks involving CE while having brain scan (showed activity in prefrontal cortex)
- activity in PC increased as task got harder
THEREFORE, study provides evidence that the CE may have a physical reality in the brain.
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