Does conflict help or hurt cognitive control? Initial evidence for an inverted U-shape relationship between perceived...

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Effort Mobilization

Background:

• Cognitive control dynamically adjusts to changing task demands, as evidenced by sequential modulation of congruency effects.
• Understanding the interplay between perceived task difficulty, effort mobilization, and cognitive control adaptation is crucial for explaining behavioral flexibility.

Purpose of the Study:

• To investigate the relationship between perceived task difficulty and the behavioral congruency-sequence effect in flanker and Stroop tasks.
• To explore pupil diameter as a physiological index of effort mobilization and mental overload during conflict tasks.
• To examine the motivational accounts of cognitive control and their influence on adaptation to task difficulty.

Main Methods:

• Four experiments were conducted using flanker and Stroop tasks to measure behavioral congruency-sequence effects.
• Perceived task difficulty was assessed, and pupil diameter was recorded as an online measure of effort mobilization.
• Regression analyses were used to associate perceived difficulty with conflict adaptation and pupil dilation.

Main Results:

• Dynamic conflict-driven adjustment in cognitive control was observed only at low levels of perceived task difficulty.
• High perceived task difficulty was associated with no or reversed conflict adaptation and a conflict-driven reduction in pupil dilation.
• An inverted U-shape relationship between perceived difficulty and cognitive control adaptations was suggested by regression analyses.

Conclusions:

• Cognitive control adaptations are sensitive to perceived task difficulty, with optimal adaptation occurring at moderate levels.
• Pupil dilation may serve as a physiological marker for mental overload, indicating reduced cognitive control capacity under high difficulty.
• Findings support motivational accounts of cognitive control, emphasizing the role of effort and perceived difficulty in adaptive control.