• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Discuss research on two biological rhythms - The infradian rhythms are rhythms that last longer than a day for example the human menstrual cycle, which occurs over a 28-day cycle.

Extracts from this document...


Discuss research on two biological rhythms: The infradian rhythms are rhythms that last longer than a day for example the human menstrual cycle, which occurs over a 28-day cycle. Research into infradian rhythms includes a study by Reinberg (1967); this study involved a woman spending 3 months in a cave with only the light of a miner's lamp. As a result of this her days lengthened to 24.9 hours and her menstrual cycle shortened to 25.7 days. This study shows that the levels of light in the cave could have affected the woman's menstrual cycle. After the study it took her body a year to readjust her menstrual cycle. ...read more.


same groups had a greater chance of becoming pregnant at the same time this would have meant that if a mother had died another mother could breast feed her baby and bring it up. It has also been found that women have a shorter menstrual cycle if they are around men a lot. This could be thought to have an evolutionary advantage, because if you are around males a lot, then a woman who ovulates more often is like to produce more offspring where as if there are not the no men around a woman would be wasting energy producing eggs more than she needs to. Ultradian rhythms are rhythms that are shorter than a day, for example oral habits, renal excretion, heart rate and hormone release. ...read more.


When he woke his son he said that he was dreaming. The same patterns were recorded in adults. Rechtschaffen and kales (1968) monitored brain waves over a nights sleep they noticed 4 stages of sleep and then a 5th stage of REM sleep. They also recorded REM sleep to occur around every 90 minutes. A criticism of sleep studies is that they are all conducted under very artificial conditions and lack ecological validity because of this. Friedman and fisher studied oral habits of people. They did this by placing them in luxurious isolation. They didn't know the time of day and had no cues, they were able to help them self to food and drink as the pleased. They found that their oral behaviours were repeated every 85 to 100 minutes. They also found that this time seemed to shorten under stress. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Physiological Psychology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Physiological Psychology essays

  1. Marked by a teacher

    Discuss research into Biological Rhythms.

    3 star(s)

    In addition there were some underlining ethical issues as Siffre said he?d experienced mild depression and some suicidal thoughts during the study. Czeisler challenged these studies due to the use of artificial light and claimed bright lights could reset the body clock.

  2. Marked by a teacher

    Describe and Evaluate Research into Infradian Rhythms

    3 star(s)

    Again, the pads were treated with alcohol and they were frozen, to be rubbed on the upper lip of the 20 other participants. In this 10 year study, McClintock and Stern found that 68% of women responded to the pheromones and their menstrual cycles were either shortened from one to

  1. Sleep and Biological Rhythms revision

    ion placebo Evaluation * Application for practical treatment = phototherapy * Light is a small factor, multicausal problem * Biorhythms can go wrong * Could be affect of circadian disruption due to natural time shift of the seasons Menstrual Cycle Endogenous pacemakers * Controlled endogenously by hormones produced by the

  2. Biological Rhythms (Sleep)

    Evidence to support the idea of an endogenous pacemaker (the SCN) relying on an external zeitgebers (light) comes from the case study of Michel Siffre. He spent 7 months in a cave under constant artificial light conditions. His sleep/wake cycle began to free-run at about 25 hours.

  1. Discuss psychological research into body rhythms

    His behaviour patterns were monitored by a camera installed in the cave, he wore wires to record his physiological functions and he was able to speak to researchers by telephone. He was guided by his bodily intuition as to when he should sleep or wake.

  2. Outline research studies into two forms of biological rhythms

    Peoples who job involves shift work face the problem of Zeitgebers, such as the onset of dawn and night time, remaining the same. As a result they are forced to adjust their natural sleep wake patterns to be the demand of shift work, in spite of the cues and triggers of Zeitgebers which suggest the opposite.

  1. The biological perspective - The mind and the body.

    inhibitory * Found in CNS * Function strengthens synaptic connections, memory * Disorder neuron loss after stroke - Endorphins ~ inhibitory * Found in brain, blood stream * Function pain inhibition * Disorder similar effect to morphine * Studying the Brain - TRAUMAS AND TUMOURS * Traumas ~ physical injury (Phineas Gage)

  2. Describe and evaluate research on ultradian and infradian rhythms

    Another example of an ultradian rhythm is the basic rest-activity cycle(BRAC). Friedman and Fisher observed the eating and drinking behaviours of an group of psychiatric patients. They discerned a clear 90 minute cycle in their behaviour. The importance of this 90 minute rhythm is probably as a form of timing

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work