BIOPSYCHOLOGY (A-Level) part 2 Flashcards
How long do circadian rhythms last?
24 hours.
Name three circadian rhythms?
The sleep-wake cycle, core body temperature and hormone production?
Why is core body temperature a circadian rhythm?
It is at its lowest at 4am and it’s highest about 6pm. Sleep occurs when the core body temperature begins to drop and rises during the last hours of sleep, promoting a feeling of alertness.
How is hormone production a circadian rhythm?
Melatonin from the pineal gland’s peak levels occur during the hours of darkness. When it is light again the production of melatonin drops and the person wakes
What were Michael Siffre’s findings?
In Southern Alps in 1962, he resurfaced in 17th September believing the date was 20th August.
He spent six months in a cave in texas, his natural circadian rhythm settled down the to just over 24 hours
When he was 60, he found his circadian rhythm stretched out to 48 hours. This showed the effects of ageing had on his cycle.
What is the evaluation for circadian rhythms?
Studies round communities living in the Artic subjected to prolong d winter darkness has no disruption.
What is an ultradian rhythm?
A cycle that lasts less than 24 hours.
Give an example of an ultradium rhythm
Cycles of sleep. Repeats itself every 90 minutes. the
What are infradian rhythms?
Cycles that last more then 24 hours.
Name 2 examples of infradian rhythms?
Female menstrual cycle and male testosterone levels.
What is the evaluation for cycles?
Although the menstrual cycle depends on internal cues. Phenomena which are external cues can synchronise and regulate the cycle.
