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Related Experiment Video

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A Real-world What-Where-When Memory Test
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Internal but not external noise frees working memory resources.

Ivan Tomić1,2, Paul M Bays2

  • 1Faculty of Humanities and Social Sciences, Department of Psychology, University of Zagreb, Zagreb, Croatia.

Plos Computational Biology
|October 16, 2018
PubMed
Summary

Working memory precision decreases with more items. Increasing internal sensory noise, unlike external stimulus noise, frees up resources for better recall of other visual information.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Working Memory

Background:

  • Recall precision in working memory degrades with increased item quantity.
  • This is often attributed to the distribution of limited representational resources.
  • The role of sensory information strength in resource allocation remains unclear.

Purpose of the Study:

  • To investigate how sensory information strength influences resource allocation in working memory.
  • To differentiate the effects of internal (sensory) versus external (stimulus) noise on memory precision.

Main Methods:

  • Manipulated signal strength of orientation stimuli by adjusting contrast (internal noise).
  • Varied within-stimulus variability to alter external noise.
  • Assessed recall precision for the target stimulus and other memory items.

Main Results:

  • Both internal and external noise manipulations similarly affected target orientation recall precision.
  • Increasing internal noise allowed for more precise storage of other stimuli.
  • Increasing external noise did not yield this benefit for other stimuli.

Conclusions:

  • Internal noise, unlike external noise, can release working memory resources.
  • A neural model of working memory encoding, using spiking activity as the limited resource, can explain these findings.