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Outline research studies into two forms of biological rhythms * Folkard et al, had six students spend a month isolated from any external cues. Temperature and activities were recorded constantly, and mood levels were measured every two hours using computer tasks. One student was asked to play her bagpipes regularly to see if the body's sense of rhythm was affected by the absence of external cues. Folkard et al findings confirmed the existence of several internal clocks. * Reinberg (1967) studied a young woman who spent three months in a cave relying on only the dim light of a miner's lamp. Her day lengthened to 24.6 hours and her menstrual cycle shortened to 25.7 days. Even though she was in the mine for only three months, it was a year before the cycle returned to its regular frequency. Reinberg speculated that it was the level of light in the cave which...

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