Bell R W, Walton S J
Exp Aging Res. 1975 Sep;1(1):63-9. doi: 10.1080/03610737508257947.
Prior to mating, virgin female Long-Evans Rattus norvegicus received 30 classical CER trials with shock as the UCS and either taped neonatal ultrasounds or a belltone as the CS. Additional animals were placed in groups controlling for exposure to shock, the ultrasounds, the belltone, and placement in the conditioning apparatus. Following mating and parturition mother-infant observations revealed that those mothers previously conditioned to neonatal ultrasounds spent more time in the lactation posture than did mothers from the other groups. The results suggest that naive mothers can be "primed" to exhibit greater maternal responsiveness than is characteristic of primiparous mothers.
在交配前，未交配过的雌性长爪沙鼠接受了30次经典的条件性情绪反应（CER）试验，以电击作为无条件刺激（UCS），并以录制的新生鼠超声波或铃声作为条件刺激（CS）。另外，将其他动物分组，以控制其接受电击、超声波、铃声的情况以及在条件化装置中的放置情况。交配和分娩后，母婴观察发现，那些先前已对新生鼠超声波形成条件反射的母亲比其他组的母亲在哺乳姿势上花费的时间更多。结果表明，未生育过的母亲可以被“激发”，从而表现出比初产母亲更强烈的母性反应。
