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Related Experiment Videos

Are there multiple visual short-term memory stores?

Ilja G Sligte1, H Steven Scholte, Victor A F Lamme

  • 1Cognitive Neuroscience Group, Department of Psychology, University of Amsterdam, Amsterdam, The Netherlands. I.G.Sligte@uva.nl

Plos One
|February 28, 2008
PubMed
Summary
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Human observers can access information from a high-capacity, fragile visual short-term memory (VSTM) store for up to four seconds. This fragile VSTM has a greater capacity than the traditional, robust VSTM, which is limited to about four items.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Traditional visual short-term memory (VSTM) models posit a limited capacity for item storage.
  • Attention-based VSTM research suggests a larger, more fragile memory store exists beyond traditional limits.
  • The capacity and characteristics of this fragile VSTM remain unclear.

Purpose of the Study:

  • To investigate the capacity, stability, and duration of fragile VSTM representations.
  • To determine if fragile VSTM capacity exceeds traditional VSTM capacity limits.
  • To differentiate between iconic memory, fragile VSTM, and robust VSTM stages.

Main Methods:

  • Participants completed a change-detection task with varied cue timing (iconic, retro, post-cue).
  • Iconic memory was assessed by its dependence on after-images and susceptibility to isoluminance and light masks.

Related Experiment Videos

  • Fragile VSTM was evaluated based on its resilience to light masks and overwriting by pattern masks.

    • Main Results:

    • Three stages of visual information processing were identified: unlimited capacity iconic memory, a 4-second fragile VSTM with at least double the capacity of robust VSTM, and limited capacity robust VSTM.
    • Iconic memory relies on retinal after-images and is diminished by isoluminance or light masks.
    • Fragile VSTM is unaffected by light masks but is overwritten by pattern masks.

    Conclusions:

    • Immediately post-stimulus, information is accessible from iconic memory via after-images.
    • A substantial, high-capacity fragile VSTM store exists for up to four seconds, overwritten by new visual input.
    • Standard change-detection tasks underestimate sustained visual representations, which are accessible at will.