John W.P. Ost

Human eyelid conditioning: The interaction of reinforcement schedule and CS-US interval length

A tendency for the customary inferiority of partial reinforcement relative to continuous reinforcement performance to be greater with a long than with a short interstimulus interval was observed. Further, it was found that the drop in performance upon shifting from continuous to partial reinforcement was greater with a short than with a long ISI. The results were discussed in terms of a negative set which develops during nonreinforcement.

Differential Classical Salivary Conditioning in the Dog: The Effects of Three CS-US Intervals

Dogs with chronic salivary fistulae received differential classical salivary conditioning with 1 of 3 CS-US intervals: 2-, 5-, or 15-sec. Differential CR magnitude was greatest in the 5-sec. and least in the 15-sec. group. The effect of ISI was due largely to its influence upon CS+ rather than CS– performance. Baseline, CR strength corrected for baseline, and UR magnitude were reliably greater following reinforced than nonreinforced trials.