  We check the robustness of a recently proposed dynamical model of associative
Pavlovian learning that extends the Rescorla-Wagner (RW) model in a natural way
and predicts progressively damped oscillations in the response of the subjects.
Using the data of two experiments, we compare the dynamical oscillatory model
(DOM) with an oscillatory model made of the superposition of the RW learning
curve and oscillations. Not only do data clearly show an oscillatory pattern,
but they also favor the DOM over the added oscillation model, thus pointing out
that these oscillations are the manifestation of an associative process. The
latter is interpreted as the fact that subjects make predictions on trial
outcomes more extended in time than in the RW model, but with more uncertainty.
