The asymmetric list shift effect - flexible adaptation to new context demands?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Factors

Background:

• The congruency effect, a key measure in cognitive tasks like the Stroop test, is influenced by trial frequency.
• Previous research indicates asymmetric adaptation to varying trial proportions, with faster decreases than increases in the congruency effect.

Purpose of the Study:

• To investigate the asymmetric list shift (ALS) effect in a within-participants design.
• To examine how practice effects interact with ALS across different Stroop task variants.

Main Methods:

• Utilized a within-participants design across four experiments employing color-word and face-name Stroop tasks.
• Manipulated trial congruency proportions (mostly congruent vs. mostly incongruent blocks).
• Controlled for practice effects through stimulus complexity and novel stimulus sets in later experiments.

Main Results:

• Experiments 1-3 showed that practice effects can obscure or facilitate the ALS effect depending on transition order.
• Experiment 4, with minimized practice confounds, confirmed the ALS effect regardless of transition order and for unbiased items.
• An asymmetric list shift effect was consistently observed, where adaptation is more pronounced when decreasing incongruency.

Conclusions:

• The asymmetric list shift (ALS) effect is a robust phenomenon in cognitive control adaptation.
• Practice effects significantly influence the manifestation of ALS, highlighting the need for careful experimental design.
• Findings suggest limitations in the flexibility of control adaptations, particularly when increasing task demands.