STUDY OF SOME PROCEDURAL VARIABLES ON SCHEDULE INDUCED DEFECATION
Abstract
Schedule-induced defecation was studied through a two-phase experiment, using rats as subjects. Since water and food
reinforcement produce different patterns of schedule-induced defecation,
phase I apllied a reinforcer, food-powder, which requires a licking
topograpy (as in water), but is a food (as in pellets). Food-related
patterns of defecation were obtained, suggesting that water-food
differences are related to the nature of the reinforcer, rather than to the
response topography which obtains it. Phase II was addressed to the
fact that although rats defecate under FI-32 seg schedules rather than
CRF, temporal parameters which distinguish the schedules are
counfounded with differences in amount of reinforcement delivered. The
size of each delivery of reinforcement was increased during FI-32 seg
sessions, so that the total reinforcement received during each session
approximated the total received during each standard CRF session. The
rats defecated under the interval schedules, as before, suggesting that
temporal schedule parameters rather than amounts of reinforcement are
involved in schedule-induced defecation.
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