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How expectations alter search performance.

Natalie A Paquette1, Joseph Schmidt2

  • 1Department of Psychology, University of Central Florida, 4111 Pictor Lane, Orlando, FL, 32816-1390, USA.

Attention, Perception & Psychophysics
|February 6, 2025
PubMed
Summary
This summary is machine-generated.

Search performance is influenced by expected difficulty. When search is harder or easier than anticipated, it alters accuracy and reaction time (RT), demonstrating how expectations shape visual search.

Keywords:
ExpectancyGuidanceRecognitionSearch difficultyVisual search

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Performance

Background:

  • Visual search performance is affected by target-distractor similarity and overall task difficulty.
  • Expectations about task difficulty can potentially modulate cognitive processes involved in search.

Purpose of the Study:

  • To investigate how matching or mismatching expected search difficulty with actual difficulty influences search performance.
  • To determine if expectations about difficulty bias search behavior towards the expected level.

Main Methods:

  • Participants performed visual search tasks with either simple targets (Landolt-C) or complex real-world objects.
  • Expectations were manipulated using a blocked design, and performance was compared across accurate, easier-than-expected, and harder-than-expected trials.
  • Key metrics included accuracy, reaction time (RT), object dwell times, and visual guidance.

Main Results:

  • Increased objective search difficulty consistently reduced accuracy and increased RT and dwell times.
  • Harder-than-expected search, relative to accurate expectations, decreased accuracy and RT.
  • Easier-than-expected search increased RT and dwell times, with some effects on guidance and distractor dwell times in Experiment 2.

Conclusions:

  • Search performance is significantly biased by expectations, shifting behavior towards the anticipated difficulty level.
  • Individual differences in sensitivity to objective difficulty correlate with the magnitude of expectation effects on performance.