In 1970 Shallice and Warrington carried out research on a paitent who suffers from amnesia.
The paitent had difficulty processing auditory infromation, this suggested that the paitnents phonological loop was damaged, this theory was further supported by the fact that the paitent could still process visual information suggesting his VSS was intact.
Ths shows that there are different STM stores.
This study can't be explained by the Multi store model.
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Dual task studies support
In 1975 Baddeley et al, carried out research for the working memory model.
The participants were asked to either perform two visual tasks or one visual and one verbal task.
The researchers found that participants had more difficulty in performing the two visual tasks.
This shows that the capacity of these individual storages has been taken up therefore showing that the working memory model is present.
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Weakness is that unknown objective of CE
Many cognitive psychologists have complained about the lack of detail when it comes to explaining the central executive.
They say it is defined as 'attension' however this is ver vague.
Many cognitive psychologists believe that there is more components to the CE just like there may be with the STM.
Because the working memory model is not fully explained it shows that it is quite unreliable to base data off.
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Word length effect supports PL
In 1975 Baddeley et al, discovered that people tend to have more difficulty remebering a list of long words as opposed to a list of short words.
This is known as the word length effect.
This can be explained by working memory model, there is little capacity in the articulatory control system which means that if there is more characters the person will have more trouble attempting to recall the list.
Word length effect will decrease if the task is repetive for examplle having one long word to remeber rather than a list.
This is because there is more storage avaiable as the participants are only required to remeber one long word.
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Model is supported by brain scans
In 1997 Braver et al, set participants to fufill tasks involving the CE whilst having their brain scanned.
Braver et al, discoverd that the area known as the prefrontal coretex was active.
Activity increased in this area as the tasks became more difficult.
This shows that the CE was using its power to fufill its orders.
This study shows evidence of the psychial location of the CE giving the working memory model more internal validity.
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