M E Dearing

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Food deprived pigeons were trained under a procedure in which trials began with the transillumination of one of three keys by red or green light. Pecking this key extinguished the light behind it and, after a variable delay (0.05, 0.5, 1.0, 2.0, or 4.0 sec), was followed by illumination of the two other keys, one by red light and one by green. Pecks on the(More)
Pigeons were trained to peck each of two response keys. Periods during which pecks on one key (the food key) produced access to grain according to a random-ratio 80 schedule alternated irregularly with periods during which food-key responses had no scheduled consequences (extinction). Both keys remained amber unless a random-ratio 8-response requirement on(More)
Squirrel monkeys were trained to press either two (phase one) or five (phase two) differently colored keys sequentially. Food presentation resulted if colors were pressed in a specific order, and high levels or accuracy were generated. Acutely, delta 9-tetrahydrocannabinol reduced accuracy and rate of responding in a dose-related fashion under both the(More)
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