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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
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A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
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Forgetting in visual working memory: Internal noise explains decay of feature representations.

Crista Kuuramo1,2, Jussi Saarinen1,3, Ilmari Kurki1,4

  • 1Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland.

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Visual working memory (VWM) decay is not feature-specific. Forgetting in VWM is caused by increasing random internal noise, not the loss of specific features over time.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual working memory (VWM) precision declines over time.
  • Forgetting is often attributed to random noise or systematic feature loss.
  • Previous research on VWM decay models yielded conflicting results.

Purpose of the Study:

  • To rigorously investigate the mechanisms of VWM decay.
  • To differentiate between systematic feature decay and random internal noise accumulation.
  • To determine if VWM decay affects all features equally or targets specific ones.

Main Methods:

  • Employed signal detection theory methods, including psychophysical classification images and ROC analysis.
  • Utilized a modified same-different memory task with short (500 ms) and long (4000 ms) retention intervals.
  • Tested VWM decay using both compound grating and radial frequency pattern stimuli.

Main Results:

  • Memory performance decreased by approximately 15% with longer retention times.
  • Classification images indicated consistent feature weighting across retention intervals, refuting feature-specific decay.
  • A significant 77% increase in stimulus-independent internal noise was observed at longer retention times.
  • Shallower ROC curve slopes confirmed the rise in internal noise.

Conclusions:

  • VWM decay is primarily driven by an increase in random internal noise, not a systematic loss of specific stimulus features.
  • The findings support a model where uniform internal noise accumulation underlies forgetting in VWM.
  • This research clarifies the fundamental mechanisms governing the fidelity of visual working memory over time.