Davison Michael, Krägeloh Christian U, Fraser Mhoyra, Breier Bernhard H
The Liggins Institute, the University of Auckland, Auckland, New Zealand.
J Exp Anal Behav. 2007 Jan;87(1):51-62. doi: 10.1901/jeab.2007.12-06.
Two groups of 10 male rats were trained to nose poke for food pellets at four alternatives that provided differing rates of pellet delivery on aperiodic schedules. After a fixed number of pellets had been delivered, 5, 10 or 20 in different conditions of the experiment, a 10-s blackout occurred, and the locations of the differing rates of pellet delivery were randomized for the next component. Two groups of rats were used: The AD group consisted of 10 rats born to dams that had normal (ad libitum) nutrition during pregnancy, whereas the 10 rats in the UN group were from dams exposed to reduced food availability during pregnancy. All pups received normal nutrition after birth. Choice between the nose-poke alternatives quickly adapted when the rates of pellet delivery were changed in both groups, but there were no consistent differences in the speed of adaptation between the two groups. The generalized matching relation failed to describe the allocation of responses among alternatives, but the contingency-discriminability model provided a precise description of performance.
两组各10只雄性大鼠接受训练，在四个选项上用鼻子戳以获取食丸，这些选项在非周期性时间表上提供不同的食丸递送速率。在递送了固定数量的食丸后（在实验的不同条件下为5、10或20个），会出现10秒的黑屏，并且在下一个部分中，食丸递送速率不同的位置会被随机化。使用了两组大鼠：AD组由10只出生于孕期母鼠营养正常（随意进食）的大鼠组成，而UN组的10只大鼠来自孕期母鼠食物供应减少的母鼠。所有幼崽出生后均接受正常营养。当两组中食丸递送速率发生变化时，在鼻子戳选项之间的选择很快就适应了，但两组之间在适应速度上没有一致的差异。广义匹配关系未能描述各选项之间的反应分配，但偶然性-可辨别性模型对表现提供了精确描述。
