Investigation of transfer of differential eyelid conditioning in successive discriminations, using unrelated words, unfamiliar forms, numerals, and spelled numbers as discriminanda revealed almost immediate and complete transfer for unrelated words after the slower initial differential conditioning. Transfer with unfamiliar forms, numerals, and spelled numbers was slower and showed elevation of responding to the negative stimulus. The slower transfer for forms was thought to be related to their unfamiliarity, and the slower transfer for numerals and spelled numbers was thought to be caused by mediation between positive and negative stimuli arising from preexperimental associations between the numbers. Implications of the numerous processes apparently involved-slow initial response learning, rapid stimulus substitution, and stimulus familiarization-were outlined.
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