Congruency sequence effects and previous response times: conflict adaptation or temporal learning?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Computational Modeling

Background:

• The congruency sequence effect (CSE) is a reduction in the Stroop effect following incongruent trials compared to congruent trials.
• Previous research has debated whether the CSE arises from conflict adaptation or other mechanisms like temporal learning.
• Recent studies have eliminated feature repetition and contingency learning as confounds, necessitating further investigation into alternative explanations.

Purpose of the Study:

• To investigate the plausibility of a temporal learning account for the congruency sequence effect.
• To examine the role of previous response time in the CSE, as it is linked to temporal learning.
• To test if an adapted cognitive model can account for the observed data under temporal learning assumptions.

Main Methods:

• Analysis of existing experimental data using a linear mixed effects model.
• Investigating the relationship between previous trial response time and the current trial congruency effect.
• Adapting the parallel episodic processing (PEP) model to incorporate temporal learning and attentional fluctuations.

Main Results:

• Slower previous response times were associated with a reduced current-trial congruency effect, specifically after congruent trials.
• The adapted parallel episodic processing (PEP) model successfully fit the data when assuming attention varied during the experiment.
• The magnitude of the congruency effect showed correlations across small blocks of trials, supporting the attentional fluctuation assumption.

Conclusions:

• Temporal learning provides a plausible explanation for the congruency sequence effect.
• Attentional fluctuations, potentially due to fatigue, may contribute to the observed patterns.
• The findings challenge solely relying on conflict adaptation to explain sequential effects in cognitive tasks.