The Impact of Speed-Accuracy Instructions on Spatial Congruency Effects

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Factors

Background:

• Humans often adjust their speed-accuracy strategy based on task demands.
• Congruency effects, a measure of cognitive conflict, vary across different tasks and strategies.
• Delta plots, which track changes in congruency effects over time, have been proposed to explain these variations.

Purpose of the Study:

• To investigate the relationship between speed-accuracy strategies and the dynamics of congruency effects within a single task.
• To test the hypothesis that the slope of delta plots predicts strategy-dependent differences in congruency effects.
• To explore the underlying mechanisms of these effects using computational modeling.

Main Methods:

• Utilized the Simon task, manipulating the presentation order of relevant and irrelevant stimulus features to create increasing and decreasing delta plots.
• Compared congruency effects under speed versus accuracy instructions.
• Employed an extended leaky, competing accumulator model for a supplementary analysis.

Main Results:

• Differences in congruency effects between speed and accuracy conditions correlated with the slope of delta plots.
• When relevant and irrelevant features were presented simultaneously, congruency effects were larger under speed set.
• Model-based analysis indicated a stronger, longer-lasting influence of irrelevant stimuli under speed set in the simultaneous presentation condition.
• Congruency effects on error rates were observed with decreasing delta plots but not increasing ones.

Conclusions:

• The dynamics of congruency effects, as reflected in delta plots, play a crucial role in how speed-accuracy strategies modulate cognitive conflict.
• The interplay between stimulus feature presentation, task strategy, and conflict dynamics influences cognitive control.
• Computational modeling provides insights into the temporal dynamics of stimulus processing and conflict resolution.