Ultradian Rhythms

biological cycles alsting elss than 24 hours, like the cycle of brain activity during sleep. 

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Dement and Kleitman
monitored electrical activity in the brain during sleep using an EEG and woke participants during different stages of sleep. People awakened during REM sleep reported dreaming 90% of the time only 7% of awakenings from NREM sleep led to dream recall
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Klein and Armitage
tested participants on verbal and spatial tasks, finding that performance was related to a 96 minute cycle, very similar to the sleep cycle
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Gerkema and Dann
Found that ultradian rhythms tend to be correlated with brain and body size with larger animals having longer cycles
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Loomis et al
discover that during sleep the waves generated by the brain slow and become larger the frequency falls as the wavelength increases.
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Aserinsky
placed the electrodes of the EEG machine near to the eyes of his eight year old son, Armond whilst he was asleep. At regular intervals he noticed that there were bursts of electrical activity.
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Card 2

Front

tested participants on verbal and spatial tasks, finding that performance was related to a 96 minute cycle, very similar to the sleep cycle

Back

Klein and Armitage

Card 3

Front

Found that ultradian rhythms tend to be correlated with brain and body size with larger animals having longer cycles

Back

Preview of the back of card 3

Card 4

Front

discover that during sleep the waves generated by the brain slow and become larger the frequency falls as the wavelength increases.

Back

Preview of the back of card 4

Card 5

Front

placed the electrodes of the EEG machine near to the eyes of his eight year old son, Armond whilst he was asleep. At regular intervals he noticed that there were bursts of electrical activity.

Back

Preview of the back of card 5

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