The most obvious ultradian rhythm is the different stages of sleep, existing within the ciradian rhythm of the sleep-wake cycle. Infradian rhythms Infradian rhythms have a cycle of longer than one day. Stages 3 and 4 are often referred to as being slow-wave sleep SWS - and sleep during this time is far more deep than in the previous two stages.
However they also found that dreams were recorded outside of REM sleep and sleepers woken during REM were not always dreaming This research has implications for identifying when dreams take place and thus explain dreams.
However, the sleeper has not reached a state of unconsciousness, and can still be woken up by certain external factors eg. There are many methodological problems with researching the sleep cycle and the nature of sleep, most of which arise from the assumptions that researchers need to make that, for example, dreaming only occurs during REM sleep, and the subjective nature of dreaming.
An interesting piece of research by Russell et al found that the menstrual cycle can be synchronized by exogenous cues, which explains the phenomenon that women who live together often have synchronized cycles. After 2 weeks if there is no fertilisation, the lining breaks down AO1 — Infradian SAD Seasonal affective disorder SAD is thought to have an infradian pattern occurring once a year This is a depressive condition that occurs during the winter months, and recovery is experienced in the summer The cause of this is thought to be the hormones serotonin which produces melatonin when it is dark.
Features of SAD include depression in winter months that improves to normal mood in summer months. Seasonal affective disorder SAD is an infradian rhythm that lasts about a year.
As the sleeper goes into Stage 2 of sleep, their brain waves become even slower and a greater amplitude. During stage 1 of sleep, the brains electrical activity begins to change, with the brain waves becoming more slow and regular. Stage 5 of sleep, the final stage in the sleep cycle before it repeats, is known as REM sleep.
During these cycles, we will experience 5 different stages of sleep- the first four being characterized as non-rapid eye movement sleep NREMand the last stage being characterized as rapid eye movement sleep REM.
Parents being woek nby the sound of their baby crying. The presence of alpha waves in the brain can usually be used to indicate that the onset of sleep has occurred, and that the person is no longer awake.
These are called theta waves. Sleep is dived into cycles, each lasting about 90 minutes.
Research into biological rhythms is determinist Researching biological rhythms such as the menstrual cycle has led to a deterministic understanding of behavioural changes associated with pre-menstrual syndrome. During this stage of sleep, it is common to experience sudden bursts of brain activity: In stagesalpha and beta wave patterns are typical in the brain, and the body is in a relaxed easily-awoken state, with a slowed heart rate and a temperature drop In stagesSWS is entered with EEG patterns showing delta waves.
This questions the assumption that dreaming only, and always, occurs during REM sleep.Ultradian rhythms are bodily rhythms that last less than 24 hours. The most obvious ultradian rhythm is the different stages of sleep, existing within the ciradian rhythm of the sleep-wake cycle.
Sleep is dived into cycles, each lasting about 90 minutes. During these cycles, we will experience 5 different stages of sleep- the first four [ ]. Biopsychology: Infradian and Ultradian Rhythms Explained. Provides an outline and evaluation, types of exam questions, and essay writing and evaluation explanations for infradian and ultradian rhythms.
Includes details about the menstrual cycle, endogenous pacemakers and exogenous zeitgebers, alongside studies conducted by. Here's an essay plan on the subject of infradian and ultradian rhythms.
Use it if you want, I chose these studies/explanations as they had the most information to write about. Infradian rhythms are biological cycles that are more than 24 hours in length but less than a year.
One example of an infradian rhythm is the menstrual cycle. The menstrual cycle is controlled by fluctuating hormone levels. Describe and evaluate research into ultradian and infradian rhythms (8+16 marks) AO1 – Ultradian sleep cycle Ultradian rhythms span less than a day, and an example of one is the sleep cycle which lasts for about 90 mins.
Describe and evaluate research into ultradian and infradian rhythms (8+16 marks) Describe and evaluate research into infradian rhythms (8+16 marks) AO1 – Infradian menstrual cycle.
Infradian rhythms span a period of more than a day but less than a year, such as the menstrual cycle regulating ovulation Model Essays. Aggression.Download