  The predictions of a class of phenomenological trap models of supercooled
liquids are tested via computer simulation of a model glass-forming liquid. It
is found that a model with a Gaussian distribution of trap energies provides a
good description of the landscape dynamics, even at temperatures above $T_{c}$,
the critical temperature of mode-coupling theory. A scenario is discussed
whereby deep traps are composed of collections of inherent structures above
$T_{c}$ and single inherent structures below $T_{c}$. Deviations from the
simple Gaussian trap picture are quantified and discussed.
