Using a single feature to discriminate and form categories: The interaction between color, form and exemplar number

► Formation of feature-side association was tested with classic and latent-class analyses. ► Latent-class results characterized learning as blending overt behavior and attention. ► Infants learned a form-side association easily and generalized it to novel stimuli. ► Infants had difficulty learning a color-side association. ► The color-side association was not generalized when they learned the discrimination.