Food-anticipatory response to restricted food access based on the pigeon’s biological clock

摘要: Pecking at the food key was recorded for 4 pigeons given restricted access to food. The period set a fixed time in light-dark cycle, continuous dark, or light. pecking activity occurred few hours before onset of all three conditions. When bird again free after being released from access, its rhythm free-ran dark. initial phase coincided with food-anticipatory previous condition. These results suggest that anticipated based on biological clock mechanism. dark anticipatory did not occur, although actually during period. pigeon’s is reduced cycle. Therefore, bird’s level probably too low shape response, even if stored memory clock.