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SlideshowReport

Wheel-Running Activity of a Rat

Description
Top: The animal’s activity occurs at “night” (that is, during the twelve hours the light is off). Middle: The period of waking follows the new dark period when the light cycle is changed. Bottom: When the animal is maintained in constant dim illumination, it displays a free-running activity cycle of approximately twenty-five hours, which means that its period of waking begins about one hour later each day.
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