Two CER experiments were conducted with'licking'as the criterion response. In Experiment I, rats' (N=12) number of tongue laps in a drinking box was signiffcantly suppressed by the presentation of a CS which had been paired with electric shock previously. This suppression was not observed in the control group of 11 Ss. In Experiment II, the effect of US intensity upon CER was tested with 11 Ss using a within-subject design. The CS's of two modalities were reinforced with electric shock of two intensities in a balanced design. The Ss' drinking response was significantly more suppressed by the presentation of a CS which had been paired with stronger shock than of that with weaker shock. The results were discussed mainly from a methodological point of view.
The variability of fear-motivated behavior was studied as a function of the intensity of fear in running and jumping situations using 44 rats. The results generally confirmed the previous findings in that the hunger-motivated behavior was more variable and more plastic than the fear-motivated behavior and that the hunger-motivated behavior also showed fixation in the jumping situation. There was also a general tendency for the behavior to become less variable, less plastic and more compulsive as a function of the intensity of fear.
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