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Related Experiment Video

Updated: Jun 28, 2026

An Operant Intra-/Extra-dimensional Set-shift Task for Mice
08:35

An Operant Intra-/Extra-dimensional Set-shift Task for Mice

Published on: January 22, 2016

The Eriksen flanker effect revisited.

A F Sanders1, J M Lamers

  • 1Department of Psychology, Free University, Amsterdam, The Netherlands.

Acta Psychologica
|January 5, 2002
PubMed
Summary
This summary is machine-generated.

Perceptual interference in flanker tasks affects choice reaction time (CRT) but not visual fixation time (VFT). Response competition, not VFT, explains flanker effects, occurring alongside visual processing.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Information Processing

Background:

  • The Eriksen flanker task is a standard paradigm for studying selective attention and perceptual interference.
  • Previous research suggests flanker stimuli can influence target processing, but the precise timing and mechanisms remain debated.
  • Understanding the interplay between visual fixation time (VFT) and choice reaction time (CRT) is crucial for elucidating attentional processes.

Purpose of the Study:

  • To investigate the role of perceptual interference on choice reaction time (CRT) and visual fixation time (VFT) in a standard Eriksen flanker task.
  • To examine how stimulus timing (interstimulus interval) and spatial configuration (functional visual field) modulate flanker effects.
  • To explore the influence of stimulus similarity on perceptual processing and response competition.

Main Methods:

  • Four experiments utilized variations of the Eriksen flanker task, measuring CRT and VFT.
  • Stimuli included incongruent flanker letters presented alongside target letters.
  • Tasks involved simple choice responses and same-different judgments, with manipulated interstimulus intervals and spatial arrangements.

Main Results:

  • Incongruent flankers significantly affected CRT but not VFT.
  • Flanker effects on CRT diminished with a 200 ms interstimulus interval and were absent in a functional visual field task.
  • Target-to-single-letter similarity prolonged CRT, while flanker-to-target similarity had no significant effect on VFT or CRT.

Conclusions:

  • Results suggest parallel perceptual processing of targets and flankers, followed by response competition.
  • Response selection and competition processes are not limited by VFT but occur in parallel with visual saccades.
  • Perceptual interference primarily impacts response selection rather than early visual encoding or fixation duration.