In Exp. 1, the authors report an influence of temporal contiguity in stimulus exposure on later judgments of similarity. Exposure to transformational information that is, information that connects two similar, but perceptually distinct stimuli was found to have no influence on later judgments of similarity. In Exp. 2, exposure to transformational information was also found not to influence later property generalization; however, exposure to within-category structure that promoted a sense of surprise (i.e., contained clear discontinuity) led to a reduction in later property generalization between two similar, but perceptually distinct stimuli. This latter effect was confirmed in Exp. 3 while ruling out any influence of temporal factors.