Se expuso a tres palomas privadas de comida a sesiones experimentales de 50 ciclos de 64 s cada uno (ciclos T) dentro de los que siempre se presentó un dispensador de comida durante 3 s (ER1). El dispensador se podía presentar nuevamente (ER2) cuando terminaba el ciclo si el sujeto se abstenía de aproximarse al (ER1), de lo contrario, este se retiraba y se cancelaba la entrega del (ER2). En cinco fases experimentales se presentó el (ER1) 3, 32, 16, 8, y 3 s antes del final del ciclo T. Además, conforme a un diseño ABA, un cambio de color en una tecla de respuesta señaló (A1 y A2) o no (B) las presentaciones del (ER1) sirviendo como un operando distractor. Se encontró que el número de (ER2) obtenidos disminuyó conforme el (ER1) se presentó más cerca del inicio del ciclo T. Así mismo, se observó que únicamente durante las condiciones A de la primera fase experimental, el número de (ER1) interrumpidos fue relativamente bajo y el número de picotazos a la tecla fue comparativamente mayor. Estos hallazgos reprodujeron y extendieron los resultados de otras investigaciones en las cuales se estudió la conducta autocontrolada de comer.
Self-controlled eating behavior was studied in three food-deprived pigeons exposed to a procedure consisting on fifty 64-s time cycles (T cycles). In each cycle a food-hopper was always presented once for 3 s (SR1) and could be presented for other 3 s (SR2) after the T cycle elapsed, according to the following contingency. If the subject approached to (SR1) it was withdrawn and (SR2) delivery was cancelled; otherwise (SR2) was presented when the T cycle elapsed. In five experimental phases (SR1) was presented 3, 32, 16, 8, and 3 s before the end of the T cycle. Additionally, according to an ABA-design, a color change of a response key signaled (conditions A1 and A2) or not (condition B) (SR1) presentations and served as a distracting operandum. It was found that the number of (SR2) obtained was lower as (SR1) was presented closer to the beginning of each T cycle, regardless of signaling (SR1) presentations. It was also found that only in the A conditions of the first experimental phase (3 s) (SR 1) interruptions were relatively low and R>0 of key pecks was comparatively high. Globally, these results replicated and extended those of previous studies in which self-controlled eating behavior was explored.
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