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The Hebb repetition effect in simple and complex memory span.

Klaus Oberauer1, Timothy Jones, Stephan Lewandowsky

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The Hebb repetition effect, improving memory recall for repeated lists, extends to complex-span tasks. This suggests integrated long-term memory representations form even with interleaved processing, challenging prior assumptions.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Memory Research

Background:

  • The Hebb repetition effect demonstrates improved recall for repeatedly presented memory lists.
  • Complex-span tasks involve alternating memory encoding/retrieval with processing tasks.
  • Prior research suggests complex-span tasks rely heavily on long-term memory.

Purpose of the Study:

  • To investigate if the Hebb repetition effect is present in complex-span tasks.
  • To examine the impact of interleaved processing on the Hebb effect.
  • To compare the magnitude of the Hebb effect in complex-span versus simple-span tasks.

Main Methods:

  • Four experiments were conducted using a complex-span task paradigm.
  • Participants performed immediate serial recall with lists that were either repeated or new across trials.
  • An unrelated processing task was interleaved with memory encoding or retrieval phases.

Main Results:

  • The Hebb repetition effect was observed in the complex-span task.
  • Interruption by a processing task did not diminish the Hebb effect size.
  • The Hebb effect was not larger in complex-span tasks compared to simple-span tasks.
  • Refreshing list items did not modulate the Hebb effect in complex span.

Conclusions:

  • Incidental long-term learning in complex-span tasks forms integrated list representations, unaffected by interleaved processing.
  • The Hebb effect's presence in complex span challenges assumptions about its reliance on long-term memory compared to simple span.
  • The findings question the role of refreshing in acquiring the long-term memory representations underlying the Hebb effect.