[Forward and backward connections in instrumental drinking conditioned reflexes in rats].

Stabilization of instrumental drinking conditioned reflexes in rats is attended with a more frequent manifestation of backward connection. In response to the conditioned signal the first to appear is a classical conditioned reflex: the rat licks the drinking cup. This is followed by pressing the bar (manifestation of backward connection) after which the rat drinks the water (forward connection). When drinking, the rat tonically presses the bar (backward connection). During the rest of the session, phasic motor reactions prevail. Individual variations of frequency of backward connections manifestations were established in different rats.