Striatal Associative Learning Signals Are Tuned to In-groups

Area of Science:

• Neuroscience
• Social Psychology
• Cognitive Science

Background:

• Adaptive social behavior relies on updating actions based on past successes or failures.
• The ventral striatum (VS) is crucial for evaluating actions and guiding learning through feedback.
• Understanding how the brain updates social knowledge and values is essential for comprehending social behavior.

Purpose of the Study:

• To investigate if feedback signaling the need to update social knowledge engages the VS.
• To determine if VS engagement facilitates subsequent social learning.
• To examine the influence of social group value (in-group vs. out-group) on VS activity.

Main Methods:

• Two functional magnetic resonance imaging (fMRI) studies were conducted.
• Participants answered questions about social group preferences, receiving trial-by-trial feedback.
• A surprise memory test assessed recall of feedback, correlating with VS activity.

Main Results:

• VS activity during social feedback correlated with subsequent memory for that feedback.
• This VS-memory correlation indicates a role in encoding and updating social knowledge.
• The effect was stronger for in-group feedback than out-group feedback, showing VS sensitivity to social value.

Conclusions:

• The VS plays a key role in updating social knowledge and adapting behavior based on feedback.
• VS signals are sensitive to the value of social groups, prioritizing learning from high-value groups.
• These findings reveal a neurobiological mechanism for tuning learning to social relevance and triggering behavioral adjustments.