Reply to Spielberger and De Nike: “Operant Conditioning of Plural Nouns: A Failure to Replicate the Greenspoon Effect”

Greenspoon J. The effect of verbal and non-verbal stimuli on the frequency of members of two verbal response classes. Unpublished doctoral dissertation, Indiana University, 1951.

Greenspoon J. The reinforcing effect of two spoken sounds on the frequency of two responses. Amer. J. Psychol., 1955, 68, 409–416.

Spielberger C. D. , & DeNike L. D. Operant conditioning of plural nouns: a failure to replicate the Greenspoon effect. Psychol. Rep., 1962, 11, 355–366.