Carlos F. Aparicio

Learn More
The Mathematical Principles of Reinforcement (MPR) model accurately predicts performance in fixed ratio (FR) schedules of reinforcement. The aim of the present study was to assess the generality of MPR with rats responding under progressive ratio (PR) schedules of different step sizes (PR1 or PR3) that provided either food or saccharin pellets. The results(More)
  • C F Aparicio
  • Journal of the experimental analysis of behavior
  • 2001
The barrier choice paradigm was used to impose a cost on rats' behavior of traveling between two levers: Pressing on two levers was reinforced with food on concurrent random-interval schedules, but rats had to climb over a barrier to move from one lever to another. The height of the barrier separating the levers was increased from 30.5 to 45.7 cm across two(More)
Contemporary analyses of choice were implemented to analyze the acquisition and maintenance of response allocation in Lewis (LEW) and Fischer 344 (F344) rats. A concurrent-chains procedure varied the delay to the larger reinforcer (0.1, 5, 10, 20, 40, and 80 s). Delays were presented within sessions in ascending, descending, and random orders. Each(More)
The standard choice situation was modified by placing a 76 cm high barrier between two levers. To travel between levers, rats had to climb the barrier. Four doses of haloperidol were assessed for effects on motor and motivational systems. The drug impeded the rats' ability to climb the barrier. Residence and travel times increased, and changeover rates(More)
The idea that dopamine mediates the reinforcing effects of stimuli persists in the field of neurosciences. The present study shows that haloperidol, a dopamine antagonist, does not eliminate the reinforcing value of food reinforcers. The ratio of reinforcers changed seven times across two levers within sessions, modeling a dynamic environment. The magnitude(More)
The generality of the molar view of behavior was extended to the study of choice with rats, showing the usefulness of studying order at various levels of extendedness. Rats' presses on two levers produced food according to concurrent variable-interval variable-interval schedules. Seven different reinforcer ratios were arranged within each session, without(More)
To examine extended control over local choice, the present study investigated preference in transition as food-rate ratio provided by two levers changed across seven components within daily sessions, and food-amount ratio changed across phases. Phase 1 arranged a food-amount ratio of 4:1 (i.e., the left lever delivered four pellets and the right lever one(More)
Studies of choice in steady state have shown that sensitivity to reinforcement increases with increasing fixed-ratio changeover (FR CO) requirements. We assessed the generality of this finding with choice in transition. Food deliveries were programmed according to concurrent variable-interval (VI) schedules. Seven different VI pairs arranged ratios of food(More)
Research has shown that the same doses of a dopamine antagonist that cause de suppression of lever pressing for a preferred meal, facilitate the consumption of another non-preferred meal freely available in the choice situation. This finding suggests that dopamine antagonists change the organism’s preferences in favor of alternatives that require less(More)