Rat choice in rapidly changing concurrent schedules.
J Exp Anal Behav
; 109(2): 313-335, 2018 03.
Article
en En
| MEDLINE
| ID: mdl-29450892
ABSTRACT
In two experiments, experimentally naïve rats were trained in concurrent variable-interval schedules in which the reinforcer ratios changed daily according to a pseudorandom binary sequence. In Experiment 1, relative response rates showed clear sensitivity to current-session reinforcer ratios, but not to previous sessions' reinforcer ratios. Within sessions, sensitivity to the current session's reinforcement rates increased steadily, and by session end, response ratios approached matching to the current-session reinforcer ratios. Across sessions, sensitivity to the current session's reinforcer ratio decreased with continued exposure to the pseudorandom binary sequence, contrary to expectations based on previous studies demonstrating learning sets. Using a second group of naïve rats, Experiment 2 replicated the main results from Experiment 1 and showed that although there were increases over sessions in both changeover rate and response rate during the changeover delay, neither could explain the accompanying reductions in sensitivity. We consider the role of reinforcement history, showing that our results can be simulated using two separate representations, one local and one nonlocal, but a more complex approach will be needed to bring together these results and other history effects such as learning sets and spontaneous recovery.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Esquema de Refuerzo
/
Conducta de Elección
Límite:
Animals
Idioma:
En
Revista:
J Exp Anal Behav
Año:
2018
Tipo del documento:
Article
País de afiliación:
Nueva Zelanda