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Operant conditioning of the skin resistance response was obtained using a dim flash of white light as the reinforcing stimulus. The results confirm earlier reports using similar procedures from another laboratory, show no differential effect of the illuminance of a reinforcing light, and contrast sharply with a study which failed to replicate previous studies using light flashes as the reinforcer. Assessment by postsession questionnaire yielded little evidence for awareness of the contingency relationship.

Operant conditioning of the skin resistance response with different intensities of light flashes