Early Life Stress Affects Human Decision Making by Increasing Expectations of Volatility.

Area of Science:

• Neuroscience
• Developmental Psychology
• Computational Psychiatry

Background:

• Flexible strategy modification is crucial for effective learning and adaptation.
• Early life experiences, particularly stress, can profoundly shape cognitive development and decision-making processes.

Purpose of the Study:

• To investigate how chronic early life stress influences information weighting and prioritization in decision-making among adolescents.
• To determine if stress exposure alters learning strategy parameters in response to environmental volatility.

Main Methods:

• Examined decision-making in an adolescent cohort (11-16 years) using a reward learning task.
• Employed a Bayesian computational learning model to analyze behavioral choices and infer environmental expectations.
• Quantified differences in learning strategy parameters based on individual stress exposure levels.

Main Results:

• Adolescents with high stress exposure exhibited a greater tendency to switch responses, even when previous choices were effective.
• This switching behavior was associated with heightened expectations of environmental volatility in high-stress individuals.
• Computational modeling revealed that stress exposure shifted learning parameters towards those optimal for unpredictable environments.

Conclusions:

• Early life stress exposure significantly impacts the development of learning parameters in humans.
• Stress biases adolescent decision-making towards strategies suited for volatile environments, affecting adaptive learning.
• These findings highlight the long-term consequences of early adversity on cognitive flexibility and learning processes.