Abstract
Day-old domestic chicks previously exposed to a constant light approached a flashing rotating light more rapidly than chicks previously kept in darkness. The speed of approach was inversely related to the length of exposure, and effects were apparent after 18 min of exposure. Responsiveness was not affected by a prior reduction in air temperature of 4°C for 60 min. After exposure in the dark to the sound of a chick loudly calling for 60 min, chicks were less responsive to the flashing light than those previously kept in relative silence.
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