[The wave-like character of the defence conditioned reflex acquisition in rats]

The dynamic peculiarities of formation of conditioned avoidance in rats were studied during 15-day sessions using different experimental paradigms (massed and spaced training). In all the experimental situations, the acquisition curves were wave-like (independently of the paradigm). Regression curves of the 6th or 7th order most perfectly fit the experimental data, which suggests that the acquisition dynamics in both paradigms is non-linear.