PLANARIA: MEMORY TRANSFER THROUGH CANNIBALISM REEXAMINED.

Planaria which have cannibalized untrained planaria exposed to photic stimuli only, handling only, or previous conditioning, all require significantly fewer trials in a conditioning situation than naive planaria.

Food versus perceptual complexity as rewards for rats previously subjected to sensory deprivation.

Rats raised in darkness or in a constantly lighted white cage go to food in a T-maze if the food is located in a checkerboard goal. They do not go to food if the food is located in a visually less complex, half-black, halfwhite goal. Normally raised rats go to food regardless of the visual complexity of the goal.