Pavlovian conditioning occurs when a correlation between a stimulus and a reinforcer is enforced. Additionally discriminative control occurs when a correlation between a stimulus and a reinforcer is enforced while a response reinforcer relationship is enforced.
Each of several birds were consecutively exposed to the following procedures. 1. clock without response requirement (Clocked Fixed Time, CFT). 2. single stimulus with a response requirement (Single Stimulus Fixed Interval, SSFI); 3. Clocked Fixed Interval (CFI); and 4. Randomly arranged clocks which were different on every trial and which required a response at the end (Random Clocked Fixed Interval, RCFI). These procedures showed that with a response dependency an interfood clock suppressed behavior below what would occur under a single stimulus or under a random stimulus condition but did not reduce early responding to zero.
The procdure illustrated in slides 45 and 46 showed that an interfood clock produced behavior above what would occur under a Pavlovian contingency without an added clock. Each of several birds were exposed to 1. a Single Stimulus Fixed Time schedule (SSFT) and then a Clocked Fixed Time (CFT) then returned to baseline (SSFT) or 2. started with a Clocked Fixed Time (CFT) and then switched to a Single Stimulus Fixed Time (SSFT).
In sum, an interfood clock maintains a characteristicly accelerating behavior. The procedure could be said to suppress responding or facilitate responding depending on the distribution maintained by the comparison procedure in the absence of temporally correlated stimuli.
Date Last Reviewed : May 26, 2003