Age-related differences in diffusion model boundary optimality with both trial-limited and time-limited tasks

Area of Science:

• Cognitive Psychology
• Aging Research
• Decision-Making

Background:

• Previous research indicated older adults adopt different speed-accuracy trade-offs compared to younger adults in decision tasks.
• These age differences were hypothesized to stem from varying task goals: younger adults balancing speed and accuracy, older adults prioritizing error minimization.

Purpose of the Study:

• To investigate whether age-related differences in speed-accuracy criteria persist even when task goals explicitly demand balancing speed and accuracy.
• To examine the influence of task difficulty on decision-making criteria across age groups.

Main Methods:

• Employed a two-choice decision task comparing standard fixed-trial blocks with fixed-time blocks.
• In fixed-time blocks, participants were instructed to maximize correct responses within a time limit, necessitating a speed-accuracy balance.
• Utilized diffusion model analysis to assess speed-accuracy criteria.

Main Results:

• Age-related differences in speed-accuracy criteria persisted even in the fixed-time condition, challenging the task goal hypothesis.
• Both young and older adults exhibited more conservative decision criteria in difficult conditions, contrary to optimal performance predictions.

Conclusions:

• Age-related differences in decision-making criteria are not solely attributable to variations in task goals.
• Both age groups demonstrate suboptimal criterion adjustments in challenging decision tasks, suggesting broader influences on cognitive control and strategy.