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Related Experiment Videos

Serial position effects in auditory event-related potentials during working memory retrieval.

Edward J Golob1, Arnold Starr

  • 1154 Med Surge I, Department of Neurology, University of California-Irvine, Irvine, CA 92627, USA. egolob@uci.edu

Journal of Cognitive Neuroscience
|March 10, 2004
PubMed
Summary

Brain mechanisms behind memory recall position effects were investigated. Event-related potentials revealed distinct patterns for auditory cortical N100 (primacy effect) and late positive wave (LPW, recency effect) during working memory retrieval.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Recall accuracy depends on item position in a memorized list, but underlying brain mechanisms are unclear.
  • Event-related potentials (ERPs) like N100 and late positive wave (LPW) decrease with increasing working memory load.

Purpose of the Study:

  • To investigate if N100 and LPW amplitudes are influenced by serial position during auditory working memory retrieval.
  • To determine if these ERP components reflect primacy and recency effects.

Main Methods:

  • Subjects performed auditory working memory tasks with set sizes of one or five digits, classifying probe digits.
  • Event-related potentials (ERPs) were recorded, focusing on N100 and LPW amplitudes.
  • A control task without memorization was included for comparison.

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Main Results:

  • N100 and LPW amplitudes were reduced in 5-item sets compared to 1-item sets.
  • N100 amplitude was larger for the first serial position (primacy effect).
  • LPW amplitude increased linearly across serial positions, showing a recency effect (5th > 1st).

Conclusions:

  • N100 and LPW ERPs are differentially affected by serial position during working memory retrieval.
  • N100 reflects a primacy effect, while LPW reflects a recency effect.
  • These findings suggest distinct neural mechanisms and timing for primacy and recency effects in memory retrieval.