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Visual long-term memory for spatial frequency?

Martin Lages1, Aileen Paul

  • 1Department of Psychology, University of Glasgow, 58 Hillhead Street, Glasgow G12 8QB, Scotland. m.lages@psy.gla.ac.uk

Psychonomic Bulletin & Review
|October 20, 2006
PubMed
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Visual discrimination performance may rely on retaining response criteria, not just visual memory. This challenges the idea of high-fidelity long-term visual memory for spatial frequency based on group data.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psychophysics

Background:

  • Visual long-term memory (LTM) is thought to support stimulus discrimination over time.
  • Decision processes, like setting response criteria, might also influence discrimination performance.

Purpose of the Study:

  • To investigate whether discrimination performance relies on visual stimulus memory or response criterion retention.
  • To examine the impact of retention intervals on spatial frequency discrimination thresholds.

Main Methods:

  • Spatial frequency discrimination thresholds were measured in observers under different retention intervals (5 sec vs. 2 h).
  • Data were collected from both group performance (single trial per observer) and individual performance (repeated trials).

Related Experiment Videos

Main Results:

  • Discrimination thresholds were significantly higher with a 2-h retention interval compared to a 5-sec interval in group performance.
  • Individual observers showed considerably lower thresholds with a 2-h interval in repeated trials.

Conclusions:

  • Discrimination performance appears to depend more on retaining task-relevant information (e.g., response criteria) than on sensory visual memory.
  • Postulating high-fidelity long-term visual memory for spatial frequency based solely on group psychophysical thresholds is potentially misleading.