Less is more: Wiring-economical modular networks support self-sustained firing-economical neural avalanches for efficient processing

Junhao Liang, Sheng-Jun Wang, Changsong Zhou
2021 National Science Review  
The brain network is notably cost-efficient, while the fundamental physical and dynamic mechanisms underlying its economical optimization in network structure and activity have not been determined. In this study, we investigate the intricate cost-efficient interplay between structure and dynamics in biologically plausible spatial modular neuronal network models. We observe that critical avalanche states from excitation-inhibition balance under modular network topology with less wiring cost can
more » ... lso achieve lower costs in firing but with strongly enhanced response sensitivity to stimuli. We derived mean-field equations that govern the macroscopic network dynamics through a novel approximate theory. The mechanism of low firing cost and stronger response in the form of critical avalanches is explained as a proximity to a Hopf bifurcation of the modules when increasing their connection density. Our work reveals the generic mechanism underlying the cost-efficient modular organization and critical dynamics widely observed in neural systems, providing insights into brain-inspired efficient computational designs.
doi:10.1093/nsr/nwab102 pmid:35355506 pmcid:PMC8962757 fatcat:grbovdstxfgazjsai6mdj3j2za