2.1.9

The Working Memory Model 2

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Visuo-Spatial Sketchpad

The VSS is often described as the ‘inner eye’. The VSS handles non-phonological information.

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Visuo-spatial sketchpad (VSS)

  • The VSS temporarily stores visual and spatial information, including the relationship between them (such as what they are and where they are located).
  • The VSS helps people to navigate around and interact with their physical environment.
  • Information in the VSS is coded and rehearsed through the use of mental pictures.
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Logie (1995) and Klauer and Zhao (2004)

  • Logie (1995) suggests sub-dividing the VSS into a visual cache (VC) that stores visual information in the form of colour, and an inner scribe (IS) that handles spatial relationships, rehearses and transfers information in the visual cache to the central executive.
  • Klauer and Zhao (2004) found more interference between two visual tasks than between a visual and a spatial task.
    • This adds support to the notion of a separate VC and IS component.
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Research of VSS

  • Gathercole and Baddeley (1993) found that participants encountered problems when simultaneously tracking a moving point of light and performing a spatial task.
    • This difficulty arose because both tasks involved using the VSS.
  • Participants had little difficulty tracking the light and performing a verbal task simultaneously. This was because one task was using the phonological loop and the other was using the VSS.
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Evaluating the VSS

  • PET scans indicate that PL and VSS are located in different parts of the brain.
  • PET scans indicate that the left hemisphere of the brain is activated with visual tasks, and that the right hemisphere is activated with spatial information. This suggests that the VC and IS are separate constructs.
  • Studies into the VSS often lack mundane realism (similarity to the real world) because many of the studies use dual-task techniques that are rarely encountered in everyday life.

Episodic Buffer

The episodic buffer (EB) was added to the working memory model later to explain how information is integrated between the other sub-systems.

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The episodic buffer

  • Baddeley added the EB in 2000 because it had been suggested that the working memory model needed a general store to operate correctly.
  • The EB explains how it is possible to temporarily store information combined together from the central executive (CE), the phonological loop (PL), the visuo-spatial sketchpad (VSS) and long-term memory.
  • The EB tries to correct problems caused by the limited capacity of both the PL and VSS as well as problems with CE storage of visual and acoustic information.
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Brain imaging evidence

  • Prabhakaran et al. used fMRI scans and found greater right-frontal brain activation for combined verbal and spatial information, but greater posterior activation for non-combined information.
  • This provides biological support for an EB that allows the temporary storage of integrated information.
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Patient study

  • Alkhalifa (2009) described the case of a patient with severely impaired long-term memory who, nevertheless, demonstrated a short-term memory capacity of up to twenty-five prose items, exceeding the capacity of both the PL and the VSS.
  • This provides support for an episodic buffer that holds information in working memory until it is recalled.

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1Social Influence

2Memory

3Attachment

4Psychopathology

5Approaches in Psychology

6Biopsychology

7Research Methods

8Issues & Debates in Psychology (A2 only)

9Option 1: Relationships (A2 only)

10Option 1: Gender (A2 only)

11Option 1: Cognition & Development (A2 only)

12Option 2: Schizophrenia (A2 only)

13Option 2: Eating Behaviour (A2 only)

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15Option 3: Aggression (A2 only)

16Option 3: Forensic Psychology (A2 only)

17Option 3: Addiction (A2 only)

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