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3 measures of stimulation seeking were administered to 128 pre-freshman students and 97 general psychology students. Normative data were provided and compared with previous data. Significantly higher means and correlations among scales were obtained for the general psychology students than for the pre-freshman students. It is possible that the Sensation-seeking Scale (SSS) tends to measure more variable characteristics than SVS or CSI. However, it is equally possible that these differences may be due to lack of reliability of the SSS or the insensitivity of the other two to change. Which of the possibilities may be or is the case is not evident from these data.

The avoidance behavior of rats was observed under the conditions of a jumping or a running apparatus paired with a 5- or a 10-sec. CS interval. It was determined that the latency of S's response late in acquisition was dependent on the duration of CS interval but independent of the type of apparatus. Trials to criterion of acquisition indicated that Ss in the running apparatus required more trials than those in the jumping apparatus. After 3 days, extinction trials to criterion indicated that more trials to criterion were required for Ss in the running apparatus and having the 10-sec. CS interval.