Recently, this journal published two studies, one by Broerse and Crassini (1980) and one by us (Kunen & May, 1980), that report contradictory findings on whether visual imagery can be used to induce contingent color aftereffects (CABs). We found, using a color-cancellation procedure, that CAEs could be produced from adaptation to visual imagery. These findings replicate and extend earlier findings of imagery-induced CABs reported by Finke and Schmidt (1977, 1978). In contrast, Broerse and Crassini (1980), using a forced-choice verbal report paradigm, report that no CABs could be obtained from adaptation to visual imagery and that interocular transfer of CAEs did not occur. 1 Finke (1981), in commenting on these articles, suggests that the failure of Broerse and Crassini to find CABs after adaptation to visual imagery might have reflected their use of a forced-choice method of measuring CABs. We also suspect that their failure to find imagery-induced CABs might have resulted from the particular method they employed. Broerse and Crassini told subjects that subsequent to adaptation they would view a test slide and would have to judge whether the test slide contained color and, if color was present, to rate the degree to which the color was present. Such a procedure may have enabled subjects to easily perceive a relationship between the study and test phases and to try to secondguess the experimenters. For example, after imagining patterns, the subjects may have figured out that there was no objectively present color in the test slides and may have felt that they were being tested for the extent to which they could be coaxed into believing that colors were present. In our colorcancellation procedure, it was virtually impossible for naive subjects to guess what our experimental hypotheses were or to see any relationship between the color-cancellation adjustments and the patterns in their imagery. Also, the color-cancellation procedure may measure CAEs more directly than verbal reports and thus may be a more sensitivemethod, The results of our study indicated that visual imagery can be a source of visual stimulation that induces CABs. Furthermore, the direction of the CAEs derived from imagery was opposite to the direction of CABs resulting from adaptation to well-focused externallypresent stimuli. Sinceit is well established that, with adaptation to checkerboard patterns of 3.0 c/d, CABs are derived from adaptation to the funda-