40 male rats, each tested daily for 15 min. in chambers having a response key projecting from each wall, were assigned to 4 conditions. No differences between conditions were found in non-stimulation levels. Mean percentage change in responsi to produce stimulation (Stimulation/Non-stimulation × 100) was: Response Equivocation, 4 keys, 49.8%; Information Transmission, 4 keys, 81.3%; Stimulus Equivocation, 2 keys, 98.9%; Information Transmission, 2 keys, 159.5%. In both of the latter conditions, 2 keys were dead. Responses were greatest for light stimulation but in a constant proportion across conditions.
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