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Infradian Rhythms - Coggle Diagram

- - - - Nine women wore cotton wool pads under their arms to collect samples of pheromones.
        
        These pads were then treated with alcohol to kill bacteria.
        
        It was then wiped under the noses of the other 20 women every day.
    - - 68% of women responded to the pheromones.
        
        Menstrual cycles became synchronised to that of the pheromone donor.
    - - The pheromones acted as an exogenous zeitgeber and modified the women’s Infradian rhythm of menstruation.
- - - - This related to activity in the endocrine system that prepares the womb for the possibility of conception after egg cells are released.
    - - Several hormones are involved and these are co-ordinated by the pituitary gland. Each cycle ends with menstruation unless pregnancy occurs.
    - - The pit unity gland may be influenced by levels of light and the secretion of melatonin and this is supported by research. This suggests that the infradiain rhythm of menstruatuon is controlled mainly by internal factors suchendogenous pacemakers.
- - - - For example
        
        Sabbagh and Barnard 1984
        
        Found that women who spend a lot of time together often find their menstrual periods become synchronised.
        
        It suggests that this is due to the unconscious detection of chemical scents called pheromones .
      - This is a strength because it further supports the idea that infradian rhythms are controlled by internal biological processes but can be modified by external factors.
    - - This helps to result in a synchronisation of pregnancies means that childcare can be shared among multiple mothers who have children at the same time.
  - - - Example
        
        McClintock
        
        They have purposely changed the length of its female participant menstrual cycles.
      - This is a weakness because researchers are not fully aware of the implications of modifying/tampering with such cycles.
        
        Such changes could negatively affect female biological processes which is a lack of protection of participants.
    - - For example
        
        Re searchers such as McClintock are unable to control other external factors that could affect the female menstrual cycle (e.g. stress, exercise/physical activity etc…).
      - This is a weakness because the lack of control over such variables makes it difficult for researchers to confirm cause and effect relationship between the presence of pheromones and the lengthening/shortening of the female menstrual cycle.