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Updated: Jul 5, 2025
A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
Published on: August 18, 2014
The lateral habenula integrates age and experience to promote social transitions in developing rats
Dana Cobb-Lewis1,2, Anne George1, Shannon Hu1
1Kennedy Krieger Institute, Baltimore MD USA 21205.
Insights
Early caregiving adversity disrupts the lateral habenula (LHb), a key brain region, impacting infant social development. Targeting LHb circuits offers potential for treating social behavior deficits linked to early life stress.
Area of Science:
- Neuroscience
- Developmental Psychology
- Psychiatry
Background:
- Social behavior deficits are early indicators of psychopathology, linked to early caregiving quality.
- Neural mechanisms connecting early care to infant social development remain unclear.
- The infant lateral habenula (LHb), crucial for forebrain and monoaminergic circuits, is understudied in development despite its link to adult psychopathology.
Approach:
- Investigated the infant lateral habenula (LHb) using a task with social and threat cues.
- Examined the impact of early caregiving adversity (ECA) on LHb structure, function, and connectivity.
- Utilized neural circuit manipulation to identify substrates of social behavior deficits.
Key Points:
- LHb principal neuron suppression showed opposing effects in infants versus juveniles, indicating a developmental switch in social approach under threat.
- ECA disrupted LHb growth curves, affecting its volume, neural activity, receptor expression, and cortical connectivity.
- Suppressing cortical projections to the LHb ameliorated social approach deficits in infants experiencing ECA.
Conclusions:
- Identified immediate biomarkers of early caregiving adversity (ECA) within the infant LHb.
- The LHb is a critical site for early social processing and behavior regulation.
- Cortico-habenula microcircuits are a substrate for social behavior disruptions following early life stress.
Abstract:
Social behavior deficits are an early-emerging marker of psychopathology and are linked with early caregiving quality. However, the infant neural substrates linking early care to social development are poorly understood. Here, we focused on the infant lateral habenula (LHb), a highly-conserved brain region at the nexus between forebrain and monoaminergic circuits. Despite its consistent links to adult psychopathology, this brain region has been understudied in development when the brain is most vulnerable to environmental impacts. In a task combining social and threat cues, suppressing LHb principal neurons had opposing effects in infants versus juveniles, suggesting the LHb promotes a developmental switch in social approach behavior under threat. We observed that early caregiving adversity (ECA) disrupts typical growth curves of LHb baseline structure and function, including volume, firing patterns, neuromodulatory receptor expression, and functional connectivity with cortical regions. Further, we observed that suppressing cortical projections to the LHb rescued social approach deficits following ECA, identifying this microcircuit as a substrate for disrupted social behavior. Together, these results identify immediate biomarkers of ECA in the LHb and highlight this region as a site of early social processing and behavior control.
