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Functional Calcium Imaging in Developing Cortical Networks

Functional Calcium Imaging in Developing Cortical Networks

Published on: October 22, 2011

Metastability of active CA3 networks.

Takuya Sasaki¹, Norio Matsuki, Yuji Ikegaya

¹Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 113-0033, Japan.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|January 20, 2007

Summary

Brain networks exhibit spontaneous activity, forming stable yet discrete states. These metastable states, governed by local dynamics, transition unpredictably, offering insights into neural information processing.

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Area of Science:

Neuroscience
Computational Neuroscience

Background:

The brain displays intrinsic spontaneous activity, crucial for neural information processing.
Understanding the structure and dynamics of this background activity is fundamental.

Purpose of the Study:

To analyze the network structure of spontaneous CA3 activity in hippocampal slices.
To investigate the stability, heterogeneity, and temporal dynamics of neural network states.

Main Methods:

Functional multineuron calcium imaging (fMCI) in hippocampal slice cultures.
Principal component analysis (PCA) to identify and characterize network states.
Analysis of state transitions and their dependence on synaptic and NMDA receptor activity.

Main Results:

Spontaneous CA3 network activity organized into discrete, heterogeneous, and stable network states.
Network states were maintained by synaptic activity and resistant to perturbations.
State transitions were sudden, rarely revisited previous states, and exhibited nonrandom temporal dynamics.
Neither state maintenance nor transitions required NMDA receptor activity.

Conclusions:

Hippocampal CA3 network states are metastable, characterized by local attractor-like dynamics.
The findings suggest a nonrandom organization underlying spontaneous brain activity.
These insights advance our understanding of neural information processing in the absence of external stimuli.