Keehn J D
J Exp Anal Behav. 1968 Jul;11(4):467-72. doi: 10.1901/jeab.1968.11-467.
Four white rats were trained to avoid electric shocks by depressing a bar after the onset of a stimulus and releasing it after termination of the stimulus. All subjects acquired the behavior of holding the bar in the presence of the stimulus and releasing it in the absence of the stimulus, but one animal almost always required a "priming" shock. The others exhibited a high level of shock avoidance.
训练了四只白鼠,让它们在刺激出现后按下杠杆以避免电击,并在刺激结束后松开杠杆。所有受试动物都学会了在刺激出现时握住杠杆,在刺激消失时松开杠杆的行为,但有一只动物几乎总是需要一次“预刺激”电击。其他动物则表现出高度的电击回避能力。