  We investigate the behavior of the residence times density function for
different nonlinear dynamical systems with limit cycle behavior and perturbed
parametrically with a colored noise. We present evidence that underlying the
stochastic resonancelike behavior with the noise correlation time, there is an
effect of optimal localization of the system trajectories in the phase space.
This phenomenon is observed in systems with different nonlinearities,
suggesting a degree of universality.
