Aitken W C, Braggio J T, Ellen P
J Comp Physiol Psychol. 1975 Aug;89(6):546-55. doi: 10.1037/h0077440.
Two experiments reported the effects of prefeeding normal and septal rats prior to their daily sessions on a differential reinforcement of low rates (DRL-20) schedule. Prefeeding reduced responses and increased reinforcements in the case of septal animals, regardless of the level of body weight. In the case of normal animals, prefeeding led to a decrease in responding and an increase in the number of reinforcements obtained only when the animals were at 85% of ad-lib levels, prefeeding, although it decreased responding, also decreased the frequency of obtained reinforcements. These results implied an impairment in normal animals in the discrimination of response feedback by stimulation arising from stomach distention.
两项实验报告了在每日实验环节之前给正常大鼠和隔区大鼠预先喂食对低反应率差别强化（DRL - 20）程序的影响。对于隔区动物，无论体重水平如何，预先喂食都会减少反应并增加强化次数。对于正常动物，只有当动物体重处于自由进食水平的85%时，预先喂食才会导致反应减少以及获得的强化次数增加，预先喂食虽然减少了反应，但也降低了获得强化的频率。这些结果表明正常动物在通过胃扩张产生的刺激来辨别反应反馈方面存在损伤。
