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Multi-electrode Array Recordings of Neuronal Avalanches in Organotypic Cultures

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Avalanche precursor behavior during cyclic-tilting experiments.

Yves Le Gonidec¹, Luc Oger², Renaud Delannay²

¹Géosciences Rennes, Univ Rennes, CNRS, -UMR 6118, F-35000 Rennes, France.

Physical Review. E

|August 19, 2025

Summary

This summary is machine-generated.

Researchers studied granular packing rearrangements during tilting experiments. They found that precursor events, occurring early in the tilt, dominate rearrangements and influence packing stability, with activity linked to wall forces and acoustic signals.

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Area of Science:

Physics
Materials Science
Geophysics

Background:

Granular materials exhibit complex behaviors under stress.
Understanding bead rearrangement is crucial for predicting material failure and flow.

Purpose of the Study:

To analyze bead rearrangements in tilted granular packings.
To characterize precursor events and their impact on system dynamics.
To correlate surface activity with in-depth measurements.

Main Methods:

Multicycle tilting experiments of granular packings (±θM).
Optical measurements of free surface activity to detect bead rearrangements.
In-depth force sensing at the container wall.
Acoustic measurements to trigger optical signals.

Main Results:

Identified ~1800 bead rearrangement events per experiment, with precursors constituting 75%.
Observed a decrease in interprecursor angle with increasing surface activity.
Cumulative activity followed a stretched exponential function; characteristic time increased with θM.
Found a linear relationship between wall and surface activities.
Measured a significant drop in elastic wave velocity during precursors.

Conclusions:

Precursor events play a significant role in granular packing dynamics and stability.
Compaction induced by precursors enhances packing stability.
Intergrain contact weakening during precursors facilitates bead rearrangement.