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Working memory capacity is not fixed, as demonstrated by a modified task incentivizing participants to recall more items. Strategic control over working memory contents challenges rigid storage limit models.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • Traditional models propose fixed working memory capacity, often cited as 4 storage slots.
  • Task instructions typically do not influence performance, supporting rigid structural models of memory.

Purpose of the Study:

  • To investigate whether working memory capacity is immutable or can be strategically influenced.
  • To examine the trade-off between memory quantity and quality under different task demands.

Main Methods:

  • A modified working memory task required participants to remember colors and report all items.
  • Incentives were introduced to encourage recall of more items, with a focus on response accuracy across all items.
  • Task-type cueing occurred either after encoding or during response to assess strategic control.

Main Results:

  • A quantity-quality trade-off was observed when task-type was blocked or cued post-encoding, indicating more items were stored less precisely.
  • This trade-off was absent when task-type was cued during the response phase.
  • Findings suggest task demands influence how information is actively encoded and maintained in working memory.

Conclusions:

  • Working memory capacity is flexible and subject to strategic control.
  • The ability to adjust encoding and maintenance strategies challenges theories of inflexible working memory limits.