Infradian & Ultradian Rhythms
- Created by: Chanteleeeee
- Created on: 01-12-16 21:32
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- Ultradian Rhythms
- biological cycle lasting less than 24 hours
- One example is the cycle of brain activity during sleep (sleep stages)
- Sleep cycle has five dinstinct stages of sleep that span about 90 minutes.
- different levels of brain activity which can be monitored using EGG
- 1st stage consists of 4-5% sleep cycle = half asleep. Muscle activity is slow.
- Stage 5 consists of 20-25% sleep cycle as you are indicating REM. Brainwaves are speeding up = REM stage.
- 1st stage consists of 4-5% sleep cycle = half asleep. Muscle activity is slow.
- different levels of brain activity which can be monitored using EGG
- biological cycle lasting less than 24 hours
- Researchers controlled the effects of caffeine and alcohol
- Found that REM activity during sleep was highly correlated with the experience of dreaming
- Brain activity varied according to how vivid the dreams are.
- DEMENT KIELTMAN - monitored sleep patterns of 9 Ppts in a sleep lab. Brainwave activity was recorded on an EEG.
- Found that REM activity during sleep was highly correlated with the experience of dreaming
- Infradian Rhythms
- biological cycles lasting more than 24 hours
- Menstrual cycle - which is regulated by hormone secretions, namely oestrogen and progesteron secreted by the ovaries.
- Occurs monthly with the average timing being 28.
- RUSSELL ET AL - found that sweat from one woman was repeatedly applied to the top lip of another woman.
- By this, their menstrual cycles should synchronise
- They concluded that the pheromones in the sweat acted as an external zeitgeber
- STERN AND McCLINTOCK - gathered samples of Pheromones from 9 women. This was done at different stages of their period.
- Gets the odour donor to place a cotton pad in their armpit for 8 hours
- Pads were treated with alcohol and frozen
- 68% women experienced changes to their cycle which brought them closer to the cycle of their odor donor.
- Could be explained as random occurrences
- 68% women experienced changes to their cycle which brought them closer to the cycle of their odor donor.
- Pads were treated with alcohol and frozen
- Gets the odour donor to place a cotton pad in their armpit for 8 hours
- By this, their menstrual cycles should synchronise
- RUSSELL ET AL - found that sweat from one woman was repeatedly applied to the top lip of another woman.
- Occurs monthly with the average timing being 28.
- Menstrual cycle - which is regulated by hormone secretions, namely oestrogen and progesteron secreted by the ovaries.
- biological cycles lasting more than 24 hours
- By this, their menstrual cycles should synchronise
- They concluded that the pheromones in the sweat acted as an external zeitgeber
- STERN AND McCLINTOCK - gathered samples of Pheromones from 9 women. This was done at different stages of their period.
- Gets the odour donor to place a cotton pad in their armpit for 8 hours
- Pads were treated with alcohol and frozen
- 68% women experienced changes to their cycle which brought them closer to the cycle of their odor donor.
- Could be explained as random occurrences
- 68% women experienced changes to their cycle which brought them closer to the cycle of their odor donor.
- Pads were treated with alcohol and frozen
- Gets the odour donor to place a cotton pad in their armpit for 8 hours
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