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Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • The congruency sequence effect (CSE) typically shows smaller effects after incongruent trials than congruent ones.
  • Existing theories suggest CSE arises from control processes managing distractors that conflict with target responses.

Purpose of the Study:

  • To investigate why the CSE is larger in prime-probe tasks when primes are occasional targets versus frequent distractors.
  • To test whether this occurs due to rare event detection or task set reuse.

Main Methods:

  • Experiment 1: Manipulated trial type frequencies to differentiate between rare event and task set hypotheses.
  • Experiment 2: Extended findings and controlled for potential perceptual differences.

Main Results:

  • The CSE effect persisted even when critical trial types appeared equally often, supporting the task set hypothesis.
  • The findings were replicated while excluding perceptual confounds.

Conclusions:

  • The congruency sequence effect is significantly influenced by the ability to reuse the same task set (stimulus-response mapping) across trials.
  • This challenges purely distraction-minimization accounts, highlighting the role of task set dynamics in cognitive control.