Inhibitory Systems in Brain Evolution: Pathways of Vulnerability in Neurodevelopmental Disorders
Kari L Hanson1,2, Demi M Z Greiner3, Cynthia M Schumann1,2
1Department of Psychiatry and Behavioral Sciences, UC Davis School of Medicine, Sacramento, California, USA.
Brain, Behavior and Evolution
|August 13, 2024
Summary
Evolutionary changes in primate brain inhibitory systems, particularly GABAergic circuitry, may explain vulnerabilities to neurodevelopmental disorders. Modifications in social structures also influence brain development, potentially contributing to neurodivergence.
Area of Science:
- Neuroscience
- Evolutionary Biology
- Genetics
Background:
- Primate brain evolution involves reorganization of sensory, social, and cognitive systems.
- Prefrontal cortex expansion correlates with altered subcortical connectivity (striatum, amygdala) impacting executive functions and socioemotional cognition.
- Increased diversity and number of inhibitory GABAergic interneurons characterize primate brains, with imbalances linked to neurodevelopmental and psychiatric disorders.
Purpose of the Study:
- To review the evolution of inhibitory brain systems and circuits.
- To explore how evolutionary modifications in GABAergic circuitry contribute to neurodevelopmental vulnerabilities.
- To discuss the impact of social organization and life history on brain development and neurodivergence.
Main Methods:
- Review of existing literature on primate brain evolution.
- Analysis of changes in inhibitory systems (GABAergic circuitry).
- Examination of the relationship between social behavior, life history, and brain development.
Main Results:
- Evolutionary modifications in GABAergic circuitry may predispose individuals to aberrant neurodevelopment.
- Changes in primate and human social organization and life history influence brain development pathways.
- Increased complexity of inhibitory systems is linked to vulnerabilities in neurodevelopmental and psychiatric disorders.
Conclusions:
- Recent evolutionary changes in GABAergic circuitry offer a basis for understanding neurodevelopmental vulnerabilities.
- Social and life history factors interact with genetic predispositions to shape brain development and neurodivergence.
- Understanding these evolutionary and developmental processes is crucial for addressing neurodevelopmental disorders.
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