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Titolo:
DETECTING A NONEVENT - DELAYED PRESENCE-VERSUS-ABSENCE DISCRIMINATIONIN PIGEONS
Autore:
DOUGHERTY DH; WIXTED JT;
Indirizzi:
UNIV CALIF SAN DIEGO,DEPT PSYCHOL LA JOLLA CA 92093 UNIV CALIF SAN DIEGO,DEPT PSYCHOL LA JOLLA CA 92093
Titolo Testata:
Journal of the experimental analysis of behavior
fascicolo: 1, volume: 65, anno: 1996,
pagine: 81 - 92
SICI:
0022-5002(1996)65:1<81:DAN-DP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHORT-TERM-MEMORY; REINFORCEMENT; DURATION; FOOD;
Keywords:
MEMORY; PRESENCE-VERSUS-ABSENCE DISCRIMINATION; DELAYED MATCHING TO SAMPLE; SIGNAL DETECTION THEORY; TIMING; KEY PECK; PIGEONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
D.H. Dougherty e J.T. Wixted, "DETECTING A NONEVENT - DELAYED PRESENCE-VERSUS-ABSENCE DISCRIMINATIONIN PIGEONS", Journal of the experimental analysis of behavior, 65(1), 1996, pp. 81-92

Abstract

Eight pigeons were trained on a delayed presence-versus-absence discrimination paradigm in which a sample stimulus was presented on some trials but not on others. If a sample was presented, then a response to one choice key produced food. If no sample was presented, a response to the other choice key produced food. The basic finding was that performance remained constant and well above 50% correct on no-sample trials as the retention interval increased, whereas performance dropped precipitously (to below 50% correct) on sample trials. In the second phase of the experiment, all of the trials were no-sample trials, and reinforcers were delivered probabilistically for one group of pigeons and according to time-based schedules for the other group. The exact reinforcement probabilities used in Phase 2 were those calculated to be in effect on no-sample trials in Phase 1 (according to a discrete-state model of performance). Subjects did not show exclusive preference for the richer alternative on no-sample trials in the first phase, but those in the probabilistic group developed near-exclusive preference for the richer alternative during the second phase. These data are inconsistent with the predictions of the discrete-state model, but are easily accommodated by an account based on signal detection theory, which also can be applied effectively to discrimination of event duration and the ''subjective shortening'' effect.

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Documento generato il 11/07/20 alle ore 14:17:39