Neuronal avalanche dynamics indicates different universality classes in neuronal cultures.

Area of Science:

• Neuroscience
• Computational Neuroscience
• Systems Neuroscience

Background:

• Neuronal avalanches are used to analyze large neuronal assembly activity.
• Scale-free statistics suggest the brain operates near a critical point.
• Understanding the origins and robustness of critical exponents remains limited.

Purpose of the Study:

• To investigate the universality of critical exponents in neuronal avalanche activity.
• To determine how different culture preparations influence avalanche statistics.
• To explore the role of network topology in shaping neuronal dynamics.

Main Methods:

• Utilized calcium imaging recordings from dissociated neuronal cultures.
• Analyzed neuronal avalanche statistics, focusing on critical exponents.
• Compared naturally developing cultures with those grown in the presence of folic acid metabolites.

Main Results:

• Found that critical exponents are not universal and vary significantly with culture preparation, indicating different universality classes.
• Naturally developing cultures exhibit avalanche statistics consistent with a mean-field branching process.
• Folic acid-metabolite-reared cultures belong to a distinct universality class with different critical exponents and stronger avalanche size clustering.
• Demonstrated pronounced correlations in avalanche sizes (size clustering) in both culture types, notably stronger in folate-reared cultures.

Conclusions:

• The brain may not universally operate near a critical point; network topology significantly influences neuronal avalanche dynamics.
• Folic acid metabolites alter neuronal culture network topology, leading to distinct critical exponents and avalanche behavior.
• Avalanche size clustering is a significant feature, particularly pronounced in folate-reared cultures, highlighting network structure's impact.