Related Experiment Video
Updated: May 21, 2025
16:01
Multi-electrode Array Recordings of Neuronal Avalanches in Organotypic Cultures
Published on: August 1, 2011
26.4K
Inhibitory neurons and the asymmetric shape of neuronal avalanches
Roberto Zaccariello1, Hans J Herrmann2,3, Alessandro Sarracino4
1University of Campania "Luigi Vanvitelli", Department of Mathematics & Physics, 81100 Caserta, Italy.
Physical Review. E
|March 19, 2025
Summary
Investigating neuronal avalanches reveals that the balance between excitation and inhibition, particularly the fraction of inhibitory neurons and their recovery rates, is key to understanding avalanche shape asymmetry in brain activity.
Area of Science:
- Computational neuroscience
- Theoretical neuroscience
- Neurodynamics
Background:
- Neuronal avalanches are studied to understand brain criticality.
- Avalanche shape asymmetry offers insights into brain activity mechanisms.
- Previous studies show conflicting results regarding avalanche shape asymmetry.
Purpose of the Study:
- To analyze the influence of inhibition, connectivity range, and short-term plasticity on neuronal avalanche shape.
- To identify mechanisms driving avalanche shape asymmetry in neural network models.
Main Methods:
- Utilized an integrate-and-fire neural network model.
- Simulated neuronal activity and analyzed avalanche shapes.
- Varied parameters like inhibitory neuron fraction, connectivity range, and synaptic plasticity.
Main Results:
- The fraction of inhibitory neurons significantly impacts avalanche shape asymmetry.
- Differential synaptic recovery rates between excitatory and inhibitory neurons are crucial.
- Model results indicate leftward asymmetry is linked to specific inhibitory neuron dynamics.
Conclusions:
- A physiological fraction of inhibitory neurons is essential for observing leftward avalanche shape asymmetry.
- Dynamic balance between excitation and inhibition, influenced by recovery rates, is vital for neural activity.
- Findings highlight the importance of inhibitory neuron function in shaping neuronal avalanches.
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