Terry L M, Johanson I B
Dev Psychobiol. 1987 May;20(3):313-31. doi: 10.1002/dev.420200309.
Twenty-four-hour deprived infant rats from 1 to 12 days of age were exposed to the odor of milk, either by itself or accompanied by oral infusions of water, sucrose, quinine, or milk (Experiment 1). Pups from 3 to 9 days of age became behaviorally active, and mouthed and probed in response to the odor of milk, even in the absence of oral infusions. Six- and 9-day-old pups also increased their intake of various test solutions in the presence of milk odor. This responsiveness to milk odor was not seen in 1-day-old pups, and waned by 12 days of age. Other stimulus odors that were presented in the same context (Experiment 2) failed to elicit such intense behavioral activation, indicating that there was some degree of specificity in the responsiveness to milk odor. Finally, 2 manipulations that influence pups' ingestion of milk, deprivation and ambient temperature, were found to influence pups' responses to milk odor (Experiment 3).
将1至12日龄的24小时未进食的幼鼠暴露于牛奶气味中，牛奶气味单独存在或伴有水、蔗糖、奎宁或牛奶的口服灌注（实验1）。3至9日龄的幼崽在闻到牛奶气味时会变得行为活跃，并做出张嘴和探索动作，即使没有口服灌注也是如此。6日龄和9日龄的幼崽在有牛奶气味时也会增加对各种测试溶液的摄入量。1日龄的幼崽没有表现出这种对牛奶气味的反应能力，且这种反应能力在12日龄时减弱。在相同环境中呈现的其他刺激气味（实验2）未能引发如此强烈的行为激活，这表明对牛奶气味的反应存在一定程度的特异性。最后，发现影响幼崽牛奶摄入量的两种因素，即饥饿和环境温度，会影响幼崽对牛奶气味的反应（实验3）。
