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Related Experiment Videos

Testing a positional model of the Hebb effect.

Nick Cumming1, Mike Page, Dennis Norris

  • 1MRC Cognition and Brain Sciences Unit, Cambridge, UK. nick.cumming@mrc-cbu.cam.ac.uk

Memory (Hove, England)
|March 26, 2003
PubMed
Summary
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Repetition in serial recall tasks strengthens memory for item positions. However, this effect did not transfer to new lists, suggesting positional strengthening is not the primary mechanism for improved recall performance.

Area of Science:

  • Cognitive Psychology
  • Experimental Psychology
  • Human Memory

Background:

  • Immediate serial recall tasks assess memory for ordered sequences.
  • Repetition of stimulus lists can improve recall performance.
  • The underlying mechanisms of repetition effects in memory are debated.

Purpose of the Study:

  • To test the hypothesis that strengthened position-item associations drive recall improvement after list repetition.
  • To investigate whether repetition effects transfer to new lists with altered item positions.
  • To evaluate the validity of a positional model of memory.

Main Methods:

  • Two experiments using immediate serial recall tasks.
  • Surreptitious repetition of stimulus lists every third trial.

Related Experiment Videos

  • Analysis of order errors for same-position (S-items) and different-position (D-items) in transfer lists.

    • Main Results:

    • Experiment 1 showed a small advantage for S-items, suggesting some positional benefit.
    • Experiment 2, with improved controls, found no advantage for S- or D-items over controls.
    • Results contradicted predictions from computer simulations of a positional model.

    Conclusions:

    • Strengthened position-item associations do not appear to be the primary driver of improved recall after list repetition.
    • The findings challenge existing positional models of memory.
    • An alternative model explaining these memory phenomena is proposed.