Researchers at National Yang Ming Chiao Tung University in Taiwan have discovered how early brain activity helps build developing communication circuits in neonatal mice, which could have implications for understanding human speech development. The study, published in EMBO Reports, found that neural activity in the ventromedial prefrontal cortex and striatum regulates the expression of FOXP2, a gene linked to human speech and communication disorders.
The team used advanced techniques to study the brain activity of mice that emitted ultrasonic vocalizations when separated from their mothers, a behavior used to study early social communication and neurodevelopmental disorders.
They identified a previously underappreciated communication circuit that becomes highly active before vocalizations, suggesting it contributes to the initiation or regulation of vocal communication.
Dr. Shih-Yun Chen, first author of the study, stated that early neural activity does not merely accompany vocalization; it contributes to the maturation of communication circuits.
The researchers also found that activating this circuit increased Foxp2 expression and promoted the formation of synaptic connections within developing corticostriatal pathways, which integrate emotional, sensory, and motor information.
Implications for Human Speech Development
The study’s findings indicate that communication-related circuits may remain biologically responsive early in development, and that Foxp2 may participate in activity-dependent plasticity and be dynamically regulated by neural activity during critical developmental windows.
According to the report, understanding these developmental mechanisms could help guide future research into social communication difficulties associated with neurodevelopmental disorders, such as childhood apraxia of speech.
The work may provide a biological framework for studying how early disruptions in brain development are associated with later speech and social communication difficulties, and why early brain development may present important opportunities for support and intervention.
Although the study was conducted in rodent models, the findings offer a new way to understand how higher-order forebrain circuits lay the foundations for communication in early life, and could have implications for the development of new treatments for human communication disorders.
Dr. Hsiao-Ying Kuo, corresponding author of the study, noted that this work provides a new perspective on how neural activity and gene regulation interact during the maturation of communication-related circuits.
Study Details
The study, titled “Activity-dependent development of vocal circuits in the neonatal rodent forebrain,” was published in EMBO Reports and can be found online.
It used a range of techniques, including advanced activity tagging, live neural recording, and circuit manipulation, to study the brain activity of neonatal mice.
The findings have important implications for understanding how communication circuits develop in the brain, and could lead to new insights into the causes of human communication disorders.
In the future, it may be possible to develop new treatments for these disorders, such as therapies that target the FOXP2 gene or the communication circuits that it regulates.
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