The lickometer: A simple device for the analysis of licking as an operant

A lickometer for recording dry (unreinforced) tube licking in rats is described. As opposed to the conventional drinkometer, where each lick produces fluid, the lickometer provides the possibility for automatically programmed intermittent reinforcement of (dry) licking, and it does not involve electrical connections through the chamber floor. Comparison of licking and leverpressing with equivalent reinforcers and under equivalent schedules of reinforcement is thus feasible.