Non-Similarity-Based Conceptualization in Pigeons via Secondary or Mediated Generalization

We used a three-step procedure to produce and disclose non-similarity-based conceptualization in pigeons. Merely by being associated with the same response in the first step, classes of perceptually dissimilar stimuli, like cars and chairs, appear to amalgamate into a new category of functionally equivalent Stimuli. Thus, requiring a new response to be made to only one of these two stimulus classes in the second step transfers to the other stimulus class in the third step. This case of non-similarity-based conceptualization in pigeons is relevant to the construction of superordinate categories and to the role of language in secondary or mediated generalization.