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An adaptive (tracking) procedure for measuring visual search.

E Matin1, K R Boff

  • 1Department of Psychology, Long Island University, Greenvale, New York 11548.

Perceptual and Motor Skills
|February 1, 1990
PubMed
Summary
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The PEST adaptive procedure was modified for cognitive studies, successfully determining visual search thresholds. Thresholds increased linearly with the number of sequential frames, showing reliable performance at fixed exposure times.

Area of Science:

  • Cognitive Psychology
  • Psychophysics
  • Human Factors

Background:

  • The PEST adaptive procedure, initially for sensory research, required adaptation for cognitive tasks.
  • The multiple sequential frames paradigm and letter-search task were employed.
  • A duration threshold for successful search was defined as performance on 75% of trials.

Purpose of the Study:

  • To adapt the PEST procedure for cognitive studies using a sequential frames paradigm.
  • To investigate the relationship between frame duration threshold and the number of sequential frames.
  • To assess performance at a computer-selected fixed exposure time.

Main Methods:

  • Modified the PEST (tracking) procedure for cognitive studies.
  • Utilized a multiple sequential frames paradigm with a letter-search task.

Related Experiment Videos

  • Determined the duration threshold for 75% correct search performance across 1-10 sequential frames.

    • Main Results:

    • The duration threshold increased linearly with the number of sequential frames for all subjects.
    • Performance on fixed-level trials at the computer-selected threshold approximated the target 75% correct.
    • The adaptive procedure effectively tracked and set appropriate exposure durations.

    Conclusions:

    • The adapted PEST procedure is suitable for cognitive research, specifically for determining visual search thresholds.
    • Findings support the use of threshold measures in basic and applied cognitive research.
    • The linear increase in threshold with sequential frames highlights the impact of display complexity on visual search performance.