  Dynamical heterogeneity in a system of Gay-Berne ellipsoids near its
isotropic-nematic (I-N) transition and also in an equimolar mixture of
Lennard-Jones spheres and Gay-Berne ellipsoids in deeply supercooled regime is
probed by the time evolution of non-Gaussian parameter (NGP). The appearance of
a dominant second peak in the rotational NGP near the I-N transition signals
the growth of pseudonematic domains. Surprisingly such a second peak is instead
observed in the translational NGP for glassy binary mixture. Localization of
orientational motion near the I-N transition is found to be responsible for the
observed anomalous orientational relaxation.
