Short-Term Memory Capacity Predicts Willingness to Expend Cognitive Effort for Reward

Area of Science:

• Cognitive Psychology
• Neuroscience
• Behavioral Economics

Background:

• Decision-making involves balancing task effort against potential rewards.
• Previous research in rodents linked cognitive effort to reward value, depression, and stress.
• Factors like short-term memory ability are crucial for human cognitive effort but difficult to study in rodents.

Purpose of the Study:

• To investigate how short-term memory ability, depression, chronic stress, and reward anticipation influence cognitive effort deployment for rewards.
• To determine if these factors predict the willingness to engage in cognitively demanding tasks for greater rewards.

Main Methods:

• An online visual short-term memory task was used with undergraduate participants.
• Participants were categorized into high and low effort groups based on task choices.
• A monetary incentive task assessed reward anticipation, followed by memory task trials with varying effort/reward options.

Main Results:

• Only superior short-term memory ability significantly predicted a higher proportion of high-effort choices.
• Drift diffusion modeling indicated greater bias towards high-effort trials in the high-effort group.
• Factors such as depression, stress, and reward anticipation did not predict effortful choices.

Conclusions:

• Individual differences in cognitive effort ability, specifically short-term memory capacity, are key determinants of cognitive effort deployment.
• The findings emphasize the role of inherent cognitive capabilities over external factors like stress or depression in effort-based decision-making.
• Future research should explore the interplay between cognitive abilities and effort-based choices in more complex scenarios.