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Gamma activity accelerates during prefrontal development.

Sebastian H Bitzenhofer1, Jastyn A Pöpplau1, Ileana Hanganu-Opatz1

  • 1Institute of Developmental Neurophysiology, Center for Molecular Neurobiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

Elife
|November 18, 2020
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Prefrontal cortex gamma oscillations mature during early development, accelerating from 15 Hz to 30-80 Hz. Pyramidal neuron activation drives this development, influenced by interneuron maturation, offering insights into neurodevelopmental disorders.

Keywords:
Gammadevelopmentmouseneuroscienceoscillationsparvalbuminprefrontal cortex

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Computational Neuroscience

Background:

  • Gamma oscillations are crucial for cognitive functions in the adult brain.
  • Their developmental trajectory in the prefrontal cortex remains largely uncharacterized.

Purpose of the Study:

  • To investigate the developmental timeline of gamma oscillations in the mouse prefrontal cortex.
  • To identify cellular mechanisms underlying the maturation of fast rhythmic activity.

Main Methods:

  • Extracellular recordings in mice across postnatal development.
  • Optogenetic stimulation of specific neuronal populations.
  • Analysis of oscillatory activity and neuronal maturation.

Main Results:

  • Fast rhythmic activity emerges in the second postnatal week, initially around 15 Hz.
  • Oscillatory frequency accelerates with age, reaching the gamma range (30-80 Hz) by the fourth postnatal week.
  • Layer 2/3 pyramidal neuron activation drives these oscillations, with frequency acceleration mirroring fast-spiking interneuron maturation.

Conclusions:

  • This study elucidates the developmental emergence and maturation of prefrontal gamma oscillations.
  • Findings provide a foundational understanding of gamma rhythm development and its potential role in neurodevelopmental disorders.