Science and Human Behavior“The verbal response “red” is established as a discriminative operant by a community which reinforces the response when it is made in the presence of red stimuli and not otherwise. This can easily be done if the community and the individual both have access to red stimuli. It cannot be done if either the individual or the community is colorblind. The latter case resembles that in which a verbal response is based upon a private event, where, by definition, common access by both parties is impossible.” (pp. 258-259)

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