GRANT, D A The influence of the inter-trial interval on the Humphreys' 'random reinforcement' effect during the extinction of a verbal response. [electronic resource] - Journal of experimental psychology Oct 1950 - 609-12 p. digital Publication Type: Journal Article ISSN: 0022-1015 Standard No.: 10.1037/h0059165 doi Subjects--Topical Terms: HumansLearningReinforcement, Psychology