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Early patterns of activity in the developing cortex: Focus on the sensorimotor system.

Roustem Khazipov1, Mathieu Milh2

  • 1INMED, Aix-Marseille University, INSERM, Marseille, 13273, France; Laboratory of Neurobiology, Kazan Federal University, Kazan, 420008, Russia.

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Summary

Early brain activity, including delta waves and oscillations, shapes developing cortical maps. This activity, driven by the thalamus and sensory feedback, is crucial for preventing neuron death and normal neurodevelopment.

Keywords:
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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cortical Development

Background:

  • Somatotopic cortical maps develop early in humans (fetal) and rodents (postnatal).
  • The sensorimotor cortex exhibits transient neuronal activity patterns like delta waves and oscillations during this period.
  • These patterns are influenced by thalamic input and sensory feedback from spontaneous movements.

Purpose of the Study:

  • To investigate the role of early sensorimotor cortex activity in the development of somatotopic maps.
  • To understand the mechanisms driving these early activity patterns and their functional significance.
  • To explore the implications of altered early activity for neurodevelopmental disorders.

Main Methods:

  • Analysis of neuronal activity patterns during early development.
  • Investigating the role of thalamic input and sensory feedback.
  • Examining the impact of activity on neuronal survival and network formation.

Main Results:

  • Early cortical activity patterns, including delta waves and oscillations, are topographically organized.
  • Thalamic input and sensory feedback from spontaneous movements are key drivers of these patterns.
  • This early activity is essential for competitive interactions among sensory inputs, neuronal survival (preventing apoptosis), and proper cortical network development.

Conclusions:

  • Transient neuronal activity in the sensorimotor cortex is critical for establishing functional somatotopic maps.
  • Disruptions in these early activity patterns can contribute to neurodevelopmental diseases.
  • Understanding these mechanisms provides insights into potential therapeutic targets for developmental disorders.