Smeets, P. M., & Barnes, D. (1995). Emergent simple discrimination via transfer from differentially reinforced S+ stimuli: A further test of the stimulus-response interaction model. Quarterly Journal of Experimental Psychology, 48B(4), 329-345.
The authors (researchers at the Leiden U, Behaviour Analysis Unit, Netherlands) examined emergent form discrimination through contiguity of forms with colors associated with different magnitudes of reinforcement, in 3 experiments. Results show that Ss acquired new discriminations under non-reinforced conditions through contiguity with differentially reinforced stimulus element stimuli. Findings support the stimulus-response interaction model for specifying transfer.