It is shown that even after partial damage to the hippocampus in male rats by quinolinic acid, which causes selective degeneration of hippocampal neurons, their conditioned reflex to time remains impaired for a period of several months. Treatment with amiridine improves the learning of time-interval estimation by such rats and promotes compensatory/restorative processes in the brain. The brain contains a great diversity of connections, and their stimulation may offer an opportunity for enhancing the operation of compensatory/restorative mechanisms in it.