  Recent experiments on Brownian colloidal particles have been studied
theoretically in terms of overdamped Langevin equations with multiplicative
white noise using an unconventional stochastic interpretation. Complementary
numerical simulations of the same system are well described using the
conventional Stratonovich interpretation. Here we address this dichotomy from a
more generic starting point: the underdamped Langevin equation and its
corresponding Fokker--Planck equation.
