Abstract
Twelve planaria were cut in half and regenerated. One member of each regenerated pair received 30 paired trials of light plus shock and 30 unpaired presentations of a vibrator each day for 5 days while the other member of each pair received vibrator plus shock and light unpaired. On the sixth day all 24 animals were given 30 trials of light and 30 of vibrator, both unpaired with shock. During the five days of acquisition the vibrator-plus-shock group showed significant differential responding while the light-plus-shock group did not. In extinction both groups made more responses to the vibrator than to the light, regardless of previous pairing with shock. Since the pilot study had shown the vibrator and light to have equal unconditioned response-evocation strength, the difference could not be attributed to a simple dynamogenic process. It could not be concluded unequivocally that differential conditioning in the planarian is possible.
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