DETERMINANTS OF REFRAINMENT FROM EATING IN THE PRESENCE OF FOOD: EFFECTS OF FOOD PRESENTATION DURATION AND PROBABILITY OF FOOD WITHDRAWAL GIVEN APPROACH.
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Title
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DETERMINANTS OF REFRAINMENT FROM EATING IN THE PRESENCE OF FOOD: EFFECTS OF FOOD PRESENTATION DURATION AND PROBABILITY OF FOOD WITHDRAWAL GIVEN APPROACH.
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Identifier
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AAI8629745
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identifier
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8629745
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Creator
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STERN, BARRY.
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Contributor
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Brett K. Cole
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Date
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1986
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, Experimental
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Abstract
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A discrete-trials procedure initially described by Cole, Coll, and Schoenfeld (1982) was implemented in an effort to teach pigeons to selectively refrain from eating from a filled, raised food hopper. Refrainment during a first hopper presentation (S1) resulted in the onset of a houselight in the presence of which a keypeck resulted in a second hopper presentation (S2) during which 3 sec of eating was permitted.;Coll (1983) demonstrated that if attempts to eat during S1 (i.e., S1 approaches) always resulted in the immediate withdrawal of the hopper such that it was impossible for the pigeon to obtain any grain, the procedure produced reliable S1 refrainment.;A major purpose of the current study was to assess the necessity and sufficiency of this S1 withdrawal requirement. Thirty animals were randomly divided into 5 groups of 6 animals each, and assigned an initial probability of S1 withdrawal given approach (Groups p = .5, .8, .9, .95, and 1.0). If hopper withdrawal was not scheduled, 3 sec of S1 eating was permitted.;Criterion S1 durations were increased in 1 sec increments from 1 to 10 sec when refrainment had occurred on 80% of the trials during one or more previous sessions. Initial acquisition was considered completed once an animal responded at the 80% criterion at an S1 duration of 10 sec.;The number of animals completing initial acquisition increased with increases in p: Group p = .5 / 0 animals, p = .8 / 1 animal, p = .9 / 3 animals, p = .95 and p = 1.0 / 6 animals each. All animals failing to complete initial acquisition at their initial p values did so at higher p values.;P was then systematically decreased for animals in Groups p = .95 and p = 1.0. Refrainment settled at or near zero for all animals at various p's > 0. Subsequent p increases were ineffective in producing reacquisition at any values less than p = 1.0 although criterion responding had previously occurred at these values while p was being decreased.;A maintenance requirement of criterion responding for 10 consecutive days following initial acquisition (Groups p = .5, .8, and .9) or reacquisition (Groups p = .95 and p = 1.0) was met for all except one animal.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Psychology
