Variables affecting the frequency of response of planaria to light.

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Abstract
The McConnell, Jacobson, and Kimble (1959) study of the effects of regeneration upon retention in Dugesia dorotoephala was replicated using D. tigrina. The Regeneration Control group data indicated sensitization due to regneration. Five additional experiments investigated variables which have been inadequately controlled in recent investigations of planaria. For D. tigrina, temperature, trough shape, and dark-adaptation affect responsiveness to light (the CR in conditioning experiments), though 10 days food deprivation, environmental contamination, or tap water vs. creek water do not. For Curtesia foremanii, the size of S is a relevant variable. As differential thigmotaxis may explain the effects of size as well as trough shape, the C. foremanii data were generalized to D. tigrina.

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