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By means of the isoconfigurational method we calculate the change in thepropensity for motion that the structure of a glass-forming system experiencesduring its relaxation dynamics. The relaxation of such a system has beendemonstrated to evolve by means of rapid crossings between metabasins of itspotential energy surface (a metabasin being a group of mutually similar,closely related structures which differ markedly from other metabasins), ascollectively relaxing units (d-clusters) take place. We now show that thespatial distribution of propensity in the system does not change significantlyuntil one of these d-clusters takes place. However, the occurrence of ad-cluster clearly de-correlates the propensity of the particles, thus ending upwith the dynamical influence of the structural features proper of the localmetabasin. We also show an important match between particles that participatein d-clusters and that which show high changes in their propensity.

Time evolution of dynamic propensity in a model glass former. The interplay between structure and dynamics