Working-Memory

Introduction to Working Memory

• Objectives:

  • Define working memory and differentiate it from short-term memory.

  • Articulate evidence for the phonological loop and visual spatial sketchpad.

• Overview of Working Memory:

  • Introduced by Baddeley and Hitch to explain tasks that require holding onto information longer than typical short-term memory (15-20 seconds).

  • Working memory supports complex cognitive processes like solving puzzles and writing.

Working Memory vs. Short Term Memory

• Short Term Memory:

  • Temporary storage of information for brief periods.

  • Limited in duration and capacity.

• Working Memory:

  • Actively used for processing information.

  • Involves task-related manipulation and maintenance of information.

Components of Working Memory

• Phonological Loop:

  • Processes verbal and auditory information.

  • Analogized to an audio cassette with limited capacity; can overwrite prior information.

  • Evidence includes:

    • Phonological Similarity Effect:

      • Participants confuse letters that sound similar (e.g., S with F), indicating phonetic storage.

    • Word Length Effect:

      • Longer words are more likely to be forgotten, reflecting the limited capacity of the phonological loop.

    • Articulatory Suppression:

      • Engaging in another verbal task impairs ability to remember items; demonstrates reliance on verbal rehearsal.

    • Irrelevant Speech:

      • Distraction from background speech disrupts memory tasks, likened to overwriting an audio recording.

Visual Spatial Sketchpad

• Processes visual and spatial information independently from the phonological loop.

• Evidence includes:

  • Interference:

    • Performing two spatial tasks (e.g., tracing a shape while identifying corners) leads to interference more than mixing verbal and spatial tasks.

  • Mental Rotation:

    • Longer mental rotation times for shapes indicate visual processing; greater rotation leads to longer response times.

    • Supports existence of separate visual processing mechanism.

• Multiple Systems:

  • Visual spatial sketchpad appears to consist of separate visual and spatial systems that can interfere with each other during tasks.

Conclusion

• Working memory encompasses different systems for storing and processing information, including the phonological loop and visual spatial sketchpad, highlighting the complexity of cognitive processes and memory.

1. Working memory differs from short-term memory in that short-term memory primarily serves as a temporary storage system for brief periods, while working memory actively processes and manipulates information to perform cognitive tasks, allowing for greater complexity of thought and action.

2. The phonological loop is a component of working memory that handles verbal and auditory information. It operates like an audio cassette, where sound information can be temporarily held and processed, allowing for tasks such as language comprehension and verbal rehearsal.

3. Four pieces of evidence for phonetic storage include:

   • Phonological Similarity Effect: Individuals tend to confuse similar-sounding letters (e.g., S and F), indicating reliance on phonetic representation.

   • Word Length Effect: People are more likely to forget longer words due to the phonological loop's capacity limitations, showing that longer items are more difficult to rehearse and store.

   • Articulatory Suppression: When individuals engage in a verbal task concurrently, it impairs their ability to remember items, highlighting the dependence on the phonological loop for verbal rehearsal.

   • Irrelevant Speech Effect: Background speech can distract from memory tasks, suggesting that extraneous auditory input can interfere with the phonological storage process.

4. The visuospatial sketchpad is another component of working memory that processes visual and spatial information without relying on verbal frameworks. It helps in tasks such as navigating environments or visualizing spatial relationships between objects.

5. Two evidences that the visuospatial sketchpad is distinct from the phonological loop are:

   • Interference: Studies show that doing two spatial tasks simultaneously, such as tracing a figure while identifying its corners, leads to more interference than combining verbal and spatial tasks, suggesting separate processing systems.

   • Mental Rotation: Research indicates longer response times when participants mentally rotate shapes, indicating that visual processing is distinct and can be quantitatively measured separate from verbal tasks.