An experiment was conducted to test the influence of perceptual biases produced by pretraining upon subsequent learning. Three groups of subjects learned a test task involving either one of two stimulus dimensions, form or color. Prior to this all groups learned two pretraining tasks involving both stimulus dimensions. For the Consonant Group the dimension relevant to solution of the pretraining tasks was the same dimension present in the test task. For the Dissonant Group, the dimension relevant in pretraining was absent in the test task. For the Ambiguous Group, both dimensions were relevant in the pretraining tasks. The influence of pretraining was shown by the fact that on the test task the Consonant Group learned fastest, the Ambiguous next, and the Dissonant slowest.