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Eriksen flanker delta plot shapes depend on the stimulus.

Michael S Pratte1

  • 1Mississippi State University, P.O. Box 6161, Mississippi State, MS, 39762, USA. prattems@gmail.com.

Attention, Perception & Psychophysics
|November 6, 2020
PubMed
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Response conflict tasks like the Eriksen flanker task show different delta plot shapes based on stimuli. This suggests early visual processing, not just stimulus type, influences these conflict measures.

Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Experimental psychology

Background:

  • Response conflict is measured using tasks like Stroop, Simon, and Eriksen flanker.
  • Delta plot analyses reveal distinct response time distribution differences across these tasks.
  • Existing theories struggle to explain these differences due to task variations.

Purpose of the Study:

  • To investigate factors influencing delta plot shapes in response conflict tasks.
  • To explore how stimulus material variations affect delta plot characteristics within the Eriksen flanker task.
  • To test hypotheses regarding the role of stimulus dimension and processing timing.

Main Methods:

  • Manipulation of stimulus materials (color, motion, arrows, gratings) across four Eriksen flanker tasks.
Keywords:
Conflict tasksInhibitionInterferenceSimonStroop

Related Experiment Videos

  • Analysis of response time distributions using delta plots.
  • Controlled comparison of delta plot shapes under varied stimulus conditions.

    • Main Results:

    • Delta plot shapes varied significantly based on stimulus type: positive-going for color/motion, negative-going components for arrows/gratings.
    • Results challenge the notion that negative-going delta plots solely indicate spatial interference.
    • Delta plot shapes are not determined by differences between target and flanker stimulus materials.

    Conclusions:

    • Stimulus processing timing in early visual cortex likely influences delta plot shapes.
    • The findings necessitate a re-evaluation of theories explaining response conflict task differences.
    • Delta plot shape is a nuanced indicator sensitive to stimulus characteristics and processing dynamics.