Motivational influences on cognitive control: Behavior, brain activation, and individual differences

Locke, Hannah; Braver, Todd S. · 2008 · OpenAlex-citations

DOI: 10.3758/cabn.8.1.99

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Summary

This study investigates how motivational states, specifically monetary incentives, influence cognitive control processes, brain activation patterns, and individual differences in performance. The research addresses a gap in cognitive neuroscience regarding the neural mechanisms by which motivation translates into improved behavioral performance. While previous studies often focused on transient, trial-by-trial reward processing, this work aimed to determine if reward-focused motivational states produce sustained changes in brain activity and whether these effects are modulated by personality traits related to reward sensitivity. The researchers employed functional magnetic resonance imaging (fMRI) while 16 participants performed the AX variant of the Continuous Performance Test (AX-CPT), a task designed to probe cognitive control. Participants completed the task under three blocked conditions: baseline, reward-incentive, and penalty-incentive. In the reward condition, participants earned money for fast, correct responses, with thresholds individually calibrated to baseline performance. The penalty condition involved losing money for errors on no-go trials. The experimental design utilized a mixed state-item approach to dissociate sustained (tonic) activity associated with the motivational state from transient (phasic) activity related to specific trial events. Additionally, participants completed personality measures assessing reward sensitivity (BIS/BAS) and reward expectancy (GRAPES) to examine individual differences. Behavioral results demonstrated that the reward incentive significantly enhanced performance, reducing reaction times by over 25% compared to baseline without increasing error rates. Neuroimaging data revealed that the reward condition was associated with a sustained increase in activation within a primarily right-lateralized network comprising the parietal and prefrontal cortex. This sustained activity distinguished the motivational state effect from transient trial-specific responses. Furthermore, individual differences analysis showed that activation in reward-related regions and the frontopolar cortex correlated with the degree of motivation-induced performance enhancement and with participants’ scores on reward-related personality scales. The findings suggest that motivational states modulate cognitive performance through sustained activity in cognitive control regions, effectively maintaining task-set information and optimizing processing. The study highlights that the efficacy of incentives is not uniform but is influenced by individual personality traits, such as reward sensitivity and expectancy. By isolating sustained neural activity, the research provides evidence that motivation acts as a stable, high-order goal that coordinates cognitive control, offering a more nuanced understanding of how affective states interact with cognitive systems to influence behavior.

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• executive function