Abstract
Naive planarians were fed planarians which had been subject to varying amounts of electric shock but no light-shock conditioning. A positive relationship was found between the amount of shock received by the cannibalized planarians and the light conditioned responses of the cannibals. This is interpreted as supporting a tissue sensitization hypothesis, rather than a memory transfer hypothesis.
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Walker, D.R., Milton, G.A. Memory transfer vs. sensitization in cannibal planarians. Psychon Sci 5, 293–294 (1966). https://doi.org/10.3758/BF03328401
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DOI: https://doi.org/10.3758/BF03328401