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Region-specific neural activity changes and hierarchical instability following social isolation
Taesub Jung1,2, Miseon Kang1, Soomin Um1,3
1Emotion, Cognition and Behavior Research Group, Korea Brain Research Institute, Daegu 41062, Republic of Korea.
Iscience
|July 28, 2026
Summary
Social isolation disrupts social hierarchy stability and alters competitive behaviors in mice. This stressor impacts brain activity in regions associated with social behavior, affecting rank dynamics.
Area of Science:
- Neuroscience
- Behavioral Biology
- Social Psychology
Background:
- Social hierarchies are crucial for group stability and coordination.
- The effects of social isolation, a significant psychosocial stressor, on social rank and stability are not well understood.
- Neural mechanisms underlying social isolation's impact on hierarchy remain unclear.
Purpose of the Study:
- To investigate how social isolation modulates social rank, stability, and competitive behaviors.
- To identify region-specific neural responses associated with these changes.
- To elucidate the impact of isolation on hierarchical dynamics.
Main Methods:
- Utilized two tube-test-based behavioral paradigms: a rank change model and a daily rank-trace model.
- Conducted behavioral analyses to assess social rank, stability, and competitive interactions (push/retreat behaviors).
- Employed c-Fos mapping to identify region-specific neural activity patterns.
Main Results:
- Social isolation led to attenuated distinctions in push and retreat behaviors, indicating disrupted social interactions.
- Long-term isolation followed by rank advancement correlated with decreased medial prefrontal cortex activity.
- Short-term isolation followed by rank advancement correlated with increased lateral habenula activity.
Conclusions:
- Social isolation significantly disrupts hierarchical stability in social groups.
- Distinct, region-specific neural activity patterns in the medial prefrontal cortex and lateral habenula are associated with isolation-induced hierarchical changes.
- These findings highlight the complex interplay between social stress, behavior, and neural function in social hierarchies.
