Impulsivity in Decision-Making: An Event-Related Potential Investigation

Area of Science:

• Cognitive Neuroscience
• Neuroeconomics
• Psychology

Background:

• Impulsivity is linked to risky decision-making, often driven by immediate rewards over long-term outcomes.
• Understanding the neural mechanisms underlying impulsivity and risk assessment is crucial.

Purpose of the Study:

• To investigate the impact of reward and punishment sensitivity in impulsivity on risky decision-making.
• To explore the neural correlates of decision-making in high and low impulsive individuals using event-related potentials.

Main Methods:

• Utilized event-related potentials (ERPs) to measure neural activity.
• Compared 14 high and 14 low impulsive undergraduates on a two-card choice task.
• Categorized participants based on median split of the Barratt Impulsiveness Scale score.

Main Results:

• High impulsives exhibited a larger P3 amplitude for low-risk choices, suggesting a bias towards high-risk options.
• Low impulsives showed a smaller P3 for low-risk choices and a larger error-related negativity (ERN) after high-risk choices.
• The ERN in low impulsives indicates they perceived high-risk choices as poor decisions, unlike high impulsives.

Conclusions:

• High impulsive individuals are biased towards immediate rewards during option evaluation.
• High impulsives demonstrate reduced sensitivity to the negative consequences of their choices.
• Neural responses differ significantly between high and low impulsive individuals during risky decision-making.