The Working Memory Model Evaluation

The Working Memory Model Evaluation

Case Study of KF

  • Outline of the case:

    • KF was a patient with a brain injury studied by Tim Shallice and Elizabeth Warrington.

    • Exhibited poor short-term memory (STM) abilities specifically for auditory information.

    • Could process visual information normally, highlighting a disparity in the types of memory functioning.

    • His immediate recall of letters and digits was better when he read them himself compared to hearing them read aloud.

Support for the Working Memory Model (WMM)

  • How KF supports the WMM:

    • The findings suggest that KF's phonological loop (PL) was damaged, indicating a specific impairment in auditory processing.

    • The visuo-spatial sketchpad (VSS) remained intact as his visual processing was normal.

    • This evidence supports the existence of separate memory stores within the WMM, aligning with its proposed structure of different components.

Limitations of the Case Study

  • Issue with the case study:

    • It remains unclear if KF had other cognitive impairments that might have influenced his performance on memory tasks.

    • As he suffered a motorcycle accident, the associated trauma may have impacted his overall cognitive functioning, casting doubt on the specificity of the findings relating to memory impairment.

Baddeley’s Study on Dual Task Performance

  • Outline of the study:

    • Baddeley conducted a dual-task experiment where participants were required to perform both a visual task and a verbal task simultaneously.

    • Performance when tasks were completed separately was comparable; however, when both tasks were of the same type (either both visual or both verbal), there was a substantial decline in performance.

Support for the Working Memory Model (WMM) from Baddeley’s Study

  • How this supports the WMM:

    • The decline in performance suggests that both visual tasks compete for the resources of the visuo-spatial sketchpad (VSS).

    • Likewise, both auditory tasks compete for the phonological loop (PL).

    • When a visual and verbal task are performed together, there is no competition for cognitive resources, which supports the claim of the existence of two separate subsystems for processing visual and verbal information within the model.

Issues with the Central Executive (CE)

  • Lack of clarity regarding the CE:

    • An important issue noted is the ambiguity surrounding the nature of the Central Executive (CE).

    • Baddeley himself recognized in 2003 that the CE requires a more precise definition beyond merely being described as attention.

    • Some psychologists even propose that the CE may consist of separate components, complicating its conceptualization.

Implications for the Working Memory Model (WMM)

  • How this weakens the model:

    • The lack of specificity regarding the Central Executive as a component raises questions about its integrity and overall effectiveness.

    • This ambiguity undermines the WMM, suggesting that the model may require revision to accommodate the complexities of cognitive functioning.