Di Giusto E L, Bond N W
Am J Psychol. 1978 Jun;91(2):313-9.
Two experimental groups of undergraduate volunteers received a single Pavlovian conditioning trial consisting of a paired presentation of a tone conditioned stimulus (CS) and a shock unconditioned stimulus (UCS). Control groups received either the CS alone or the UCS alone. Subjects from one experimental group were subsequently instructed that they would not receive further shocks, while the other experimental group received no such instructions. The CS alone was then presented once to all four groups while subjects were engaged in a button-pressing task maintained by slide reinforcement. During the latter phase, rate of button-pressing was measured. Classically conditioned suppression of button-pressing was obtained in the noninstructed experimental group but not in the instructed group. The results demonstrate that suppression can be a sensitive index of Pavlovian conditioning in humans but question the use of conditioned suppression as an adequate experimental analog of clinically observed anxiety-motivated behavior.
两组本科志愿者实验组接受了一次巴甫洛夫条件反射试验，试验包括配对呈现一个音调条件刺激（CS）和一个电击非条件刺激（UCS）。对照组分别单独接受CS或单独接受UCS。随后，一个实验组的受试者被告知他们不会再受到电击，而另一个实验组没有得到这样的指示。然后，在所有四组受试者进行由幻灯片强化维持的按键任务时，单独呈现CS一次。在后期阶段，测量按键速率。在未得到指示的实验组中获得了经典条件反射性的按键抑制，但在得到指示的组中没有。结果表明，抑制可以作为人类巴甫洛夫条件反射的一个敏感指标，但对将条件性抑制作为临床观察到的焦虑驱动行为的适当实验模拟的用途提出了质疑。
