Abstract
Drinking, food-cup contact, exploration, and grooming were analysed in two food-deprived rats when food pellets were delivered on a fixed-time (FT) schedule of 1 min. The probability of drinking was high immediately after pellet delivery and then decreased to zero with the gradual increase in the probability of food-cup contact, exploration, and grooming. The probability of grooming decreased and the probability of food-cup contact and exploration increased when drinking was absent after occasional feeder operations without pellet delivery (reinforcement omission). This omission effect upon food-cup contact and exploration responses was experimentally simulated by preventing the drinking burst after ordinary pellet delivery.
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