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Early Development of Network Oscillations in the Ferret Visual Cortex
Yuhui Li1, Chunxiu Yu1, Zhe Charles Zhou1,2
1Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
Scientific Reports
|December 21, 2017
Summary
Visual cortex development shows a shift towards faster brain oscillations (gamma band) after eye-opening, indicating maturation of neural circuits and enhanced visual processing. This highlights gamma oscillations as a key marker of cortical development.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Computational Neuroscience
Background:
- Neural network oscillations are crucial for brain function but their developmental changes and interactions with neuronal spiking remain unclear.
- Understanding the interplay between different oscillation frequencies and their relationship with spiking activity during development is essential for characterizing neural circuit maturation.
Purpose of the Study:
- To investigate the developmental changes in local field potential (LFP) and multi-unit activity (MUA) in the visual cortex of juvenile ferrets before and after eye-opening.
- To examine the interaction between neural oscillations and neuronal spiking, and how different oscillation frequencies interact during cortical maturation.
Main Methods:
- Recorded spontaneous and visually-elicited LFP and MUA in the visual cortex of freely-moving juvenile ferrets.
- Analyzed changes in LFP power, spike-LFP phase coupling, and phase-amplitude coupling across different frequency bands.
- Assessed visual response entrainment of LFP oscillations.
Main Results:
- LFP power, both spontaneous and visually-elicited, increased after eye-opening, particularly in higher frequency bands (>30 Hz).
- Spike-LFP phase coupling shifted towards higher frequencies (high-gamma band), while phase-amplitude coupling showed increased high-gamma amplitude coupling to theta/alpha phases.
- Visual stimulation led to greater entrainment of LFP oscillations at higher frequencies (>10 Hz) post-eye-opening.
Conclusions:
- Cortical maturation after eye-opening is characterized by a significant shift towards faster neural oscillations, particularly in the gamma frequency band.
- Gamma oscillations appear to be a critical signature of the maturation of visual cortical circuitry and its functional development.
- These findings provide insights into the developmental dynamics of neural oscillations and their role in sensory processing maturation.
