Document Type



Three food-deprived rats (80% of their free-feeding weights)
developed schedule-induced drinking after being exposed to a
multiple fixed-time schedule (FT 60-s FT 18-s) of food-pellet
presentation. A 3-s signaled delay was then initiated by each lick,
and the rate of licking was reduced to a much greater extent in the
FT 18-s component in two rats. With these rats, a 9-s lickdependent
signaled delay then occurred in the FT 60-s component
only, and a reduction was observed in licks per minute similar to
that observed previously with the 3-s delay in the richer
component. With the third rat the delays which were effective in
reducing licking were 6 and 18 s in the FT 18-s and FT 60-s
components, respectively. Measures of the percentage of interfood
intervals with at least one lick produced less pronounced effects.
These results suggest that the ratio between delay length and
interfood interval length is critical for lick-dependent delays to be
effective in punishing schedule-induced drinking.