Misanin J R, Brownback T, Shaughnessy L D, Hinderliter C F
Dev Psychobiol. 1980 Jan;13(1):85-93. doi: 10.1002/dev.420130112.
The shock-escape behavior of preweanling rats in a multidirectional escape situation was examined in 3 experiments. In Experiment I, 5-, 7-, 9-, and 11-day-old rats were given shock-escape training on each of 3 days. Rats younger than 7 days of age did not improve escape responding within or over sessions. Animals 7 days of age and older, however, showed both an intrasession improvement and an intersession improvement that could not be attributed solely to maturation. In Experiment II, the escape behavior of 3-, 5-, and 7-day-old was examined in an apparatus modified to take into account the poor locomotor abilities of these animals. They were given escape training on 3 successive days. Again; no within-session improvement was found in rats under 7 days of age. However, an intersession improvement was found in rats whose training began at 5 days of age. This improvement was due to maturation and did not reflect a cumulative effect of training. Experiment III, like Experiment I, demonstrated that the intersession improvement in the older rats was not simply a maturation effect. It also demonstrated that the improvement could not be attributed to the stress of prior handling, shock, or body temperature loss, but was, rather, a retention effect. These results support the contention that the emergence of memory is task specific.
在3个实验中研究了断奶前大鼠在多方向逃避情境中的休克逃避行为。在实验I中，对5日龄、7日龄、9日龄和11日龄的大鼠在3天中的每一天都进行休克逃避训练。7日龄以下的大鼠在各节次内或各节次间均未改善逃避反应。然而，7日龄及以上的动物在节次内和节次间均有改善，且不能仅归因于成熟。在实验II中，在一种经过改良的装置中检查了3日龄、5日龄和7日龄大鼠的逃避行为，该装置考虑到了这些动物较差的运动能力。它们连续3天接受逃避训练。同样，7日龄以下的大鼠在节次内没有改善。然而，在5日龄开始训练的大鼠中发现了节次间的改善。这种改善是由于成熟，并不反映训练的累积效应。实验III与实验I一样，表明年长大鼠的节次间改善不仅仅是成熟效应。它还表明，这种改善不能归因于先前处理、休克或体温降低的应激，而是一种记忆效应。这些结果支持了记忆的出现是特定于任务的这一论点。
