  We have investigated the mass loss processes in Long Period Variables, by
combining radiative transfer modeling with mid-IR imaging and spectroscopic
observations. We find a correlation between variability type and temporal
variations in the mass loss rate. Mira variables are more likely to maintain
constant mass loss rates over long period of time. Semiregular and Irregular
variables are characterized by frequent interruptions in their mass loss rate,
on timescales of ~100 yr. High resolution imaging of individual Long Period
Variable sources show departures from spherical symmetry. We present the case
of o Cet (Mira), in which the presence of a low mass companion plays an active
role in shaping the circumstellar environment.
