Reward-based modulation of task-switching performance: a diffusion model analysis

Area of Science:

• Cognitive Psychology
• Neuroscience
• Behavioral Economics

Background:

• Cognitive control is crucial for goal-directed behavior.
• Motivation, particularly through rewards, is known to influence cognitive processes.
• Task switching paradigms are used to measure cognitive control, including inhibitory control.

Purpose of the Study:

• To investigate the impact of reward on cognitive control, specifically inhibitory control during task switching.
• To examine how performance-contingent rewards affect task switching costs and underlying neural mechanisms.

Main Methods:

• Two task switching experiments were conducted with reward manipulation.
• Participants (N=96 each) switched between three tasks, with reward groups receiving performance-contingent rewards.
• N-2 task repetition costs were measured as an index of inhibitory control.
• Diffusion modeling was employed to analyze performance dynamics.

Main Results:

• Reward manipulation led to significantly faster performance in the reward group compared to the control group.
• Diffusion modeling indicated an increased drift rate in the reward group, suggesting enhanced attentional focus.
• No robust evidence was found for reward-based modulation of N-2 task repetition costs, a marker of inhibitory control.

Conclusions:

• While rewards enhance overall task performance speed and attentional focus, they may not directly modulate inhibitory control in task switching.
• The observed N-2 task repetition costs were small, potentially requiring different experimental designs to detect reward-related effects on inhibitory control.
• Reward might not interact with inhibitory control at the task level, suggesting alternative mechanisms at play.