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We introduce a new and robust approach for characterizing spatially andtemporally heterogeneous behavior within a system based on the evolution ofdynamic fuctuations once averaged over different space lengths and time scales.We apply it to investigate the dynamics in two canonical systems as the glasstransition is approached: simulated Lennard-Jones liquids and experimentaldense colloidal suspensions. We find that in both cases the onset of glassinesis marked by spatially localized dynamic fluctuations originating in regions ofcorrelated mobile particles. By removing the trivial system size dependence ofthe fluctuations we show that such regions contain tens to hundreds ofparticles for time scales corresponding to maximally non-Gaussian dynamics.

Spatiotemporal intermittency and localized dynamic fluctuations upon approaching the glass transition