Rats were permitted to ingest a novel food and a familiar food. One hour later they were x-irradiated. When they were subsequently allowed to choose between these foods, their preference for the novel food was less than that exhibited by appropriate controls.

Data were obtained on the spectral sensitivity of the light-adapted monkey by two operant conditioning techniques adapted to use with brief duration stimuli: cued avoidance conditioning, and a positive reinforcement-reaction time method. The results are compared with human photopic spectral sensitivity, and detailed similarities are found.

AND E•wxN W. B•r>•F Honeywell Inc., St. Paul, MinnesotaWith a feedback method, two groups were taught to identify, by label, complex sounds. One group continued to hear the sound following response and during identification; the second group experienced a 1-sec delay between the sound and its label. Better learning and long-term retention characterized the group for which sound and label overlapped.

Three groups of subjects were taught to identify, by label, complex sounds. With temporal overlap controlled, confirmation and prompting training procedures were compared. Despite recent emphasis on the superiority of prompting procedures, no significant difference in the efficacy of the two methods was observed.

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