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Visual memory for novel shapes: implicit coding without attention

B DeSchepper1, A Treisman

  • 1Department of Psychology, University of California, Berkeley, USA.

Journal of Experimental Psychology. Learning, Memory, and Cognition
|January 1, 1996
PubMed
Summary
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Implicit memory for novel shapes can persist for weeks without conscious recall, suggesting visual system plasticity. Attention and repetition may aid retrieval, not memory formation.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Implicit memory, unlike explicit memory, operates unconsciously.
  • Negative priming paradigms reveal processing efficiencies for previously encountered stimuli.
  • Understanding the persistence of visual memory informs theories of learning and perception.

Purpose of the Study:

  • To investigate the durability of implicit memory for novel visual shapes.
  • To explore the role of attention and repetition in the formation and retrieval of visual memories.
  • To examine individual differences in implicit memory performance.

Main Methods:

  • Utilized a negative priming paradigm with novel shape stimuli.
  • Assessed memory performance immediately and after a one-month delay.

Related Experiment Videos

  • Measured both negative priming effects and explicit memory recall.

    • Main Results:

    • Implicit shape representations persisted across 200 intervening trials and up to a month without decrement.
    • No explicit memory for the shapes was evident at any time point.
    • Individual differences in negative priming were observed, with some participants showing facilitation instead.
    • A trend suggested memory survival beyond an "action tag" for attention.

    Conclusions:

    • The visual system exhibits both plasticity and permanence in forming lasting implicit memories.
    • Attention and repetition may primarily facilitate voluntary retrieval rather than initial memory encoding.
    • Implicit visual memory can be remarkably robust and long-lasting, independent of explicit awareness.