A longitudinal analysis of adolescent decision-making with the Iowa Gambling Task

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Science

Background:

• Adolescence is characterized by increased risk-taking, making decision-making assessment crucial.
• Standard Iowa Gambling Task (IGT) studies are often cross-sectional, limiting understanding of developmental trajectories.
• Longitudinal data is needed to observe behavioral changes in decision-making over time during adolescence.

Purpose of the Study:

• To longitudinally investigate decision-making abilities in healthy adolescents and young adults using the IGT over a 10-year period.
• To examine the influence of age, intelligence, and affective dispositions (Behavioral Inhibition and Activation System - BIS/BAS) on IGT performance.
• To differentiate predictors of decision-making under ambiguity versus risk.

Main Methods:

• A 10-year longitudinal study with 189 participants (aged 9-23 at baseline), assessed at 2-year intervals (5 time-points).
• Standard Iowa Gambling Task (IGT) administered with shuffled deck contingencies to mitigate practice effects.
• IGT performance analyzed for overall, ambiguity (blocks 1-2), and risk (blocks 3-5) metrics, controlling for intelligence and BIS/BAS scores.

Main Results:

• Age and intelligence positively predicted overall IGT performance, while affective approach tendencies (BAS) negatively predicted it.
• Age improved performance in both ambiguity and risk decision-making; BAS predicted worse performance for both.
• Intelligence significantly predicted decision-making under risk, but not under ambiguity.

Conclusions:

• This study demonstrates age-related improvements in reward-based decision-making during adolescence and young adulthood.
• Cognitive (intelligence) and affective (BAS) variables are associated with these decision-making improvements.
• Findings offer insights into adolescent development and the factors influencing risk and ambiguity processing.