He found that at first his sleep pattern was erratic, but settled then down to a regular pattern of hours. This is reductionist as other Endogenous pacemakers essay can draw different conclusions, which the biological approach fails to account for.
A key strength of this study is that it is a natural experiment on real-life EP in chipmunks and therefore achieves mundane realism. Thus, maintain our sleep-wake cycle. This is supported by studies such as DeCoursey who found that removing the SCN in 30 chipmunks and returning them to their natural habitat, proved costly for their survival.
Miles et al found the circadian rhythm of a blind man is Therefore, this suggests that EP, most importantly the SCN, indeed aids survival, as the absence of this important EP proved detrimental for the survival of the chipmunks.
However, we cannot extrapolate these findings as there are not representative. The role of EP can also be criticised for having a deterministic view.
These studies can also be criticized for imposed etic as researchers assume findings are relevant to humans as well as animals. Case studies such as Siffre can also be criticized for beta bias as it is a study of one man it fails to account for possible differences in females.
However, this research has received support. They found that after 80 days significantly more chipmunks had died compared to a control group with normal functioning SCNs. Endogenous pacemakers essay view that EP alone control our bodily rhythms such as the sleep-wake cycle denies free will.
For instance, it is widely accepted that when it is dark we must sleep and when it is light we awake. This provides support for the role of EP in the control of circadian rhythms and the similar findings serves to increase its reliability.
Once again suggesting it is reductionist. Furthermore, the famous study of free-running biological rhythms in involving Michel Siffre supports the presence of EP in our sleep-wake cycle.
This was demonstrated as Siffre spent 6 months in a cave in Texas, separated from the influence of exogenous zeitgebers EZ such as light. The SCN is located above the optic chiasm.
EZ are also thought to influence or rhythms, therefore we could argue the role of EP has been exaggerated. In evaluating the role of EP in the control of circadian rhythms, it is important to point out that the case study of Michel Siffre used artificial light when he was awake and this was turned off when he was asleep, it is likely that this could have stimulated the production of cortisol and melatonin, therefore, artificial light is a confounding variable that possibly has an impact on the findings.
When light hits the retina it transfers through the optic nerve to the SCN which stimulates the release of hormones such as cortisol and melatonin in the pineal gland. However, studies investigating the role of EP that use animals, such as DeCoursey are highly unethical; this is because removing the SCN of the chipmunks would have caused them a considerable amount of pain and eventually resulted in death.
Furthermore, sleep-wake studies supporting the existence of EP have reported a fairly consistent finding of about 25 hours. It has been suggested by evolutionary psychologists that endogenous pacemakers EP have an adaptive value in controlling biological rhythms such as the sleep-wake cycle, suggesting it aids survival.
This controls circadian rhythms. Research also takes a biological approach in explaining the role of EP n the control of bodily rhythms. For example, the behavioural approach would suggest that the control of bodily rhythms are influences by the people around us social learning theory and social norms.
In humans, the main biological clock is the suprachiasmatic nucleus SCN which is located in the hypothalamus. For example, Miles et al found that a man who was blind from birth had a circadian rhythm of Studies conducted to investigate the role of EP have also given us a better understanding of their role, the function of the SCN and the effects of it being damaged, such as DeCoursey It is also culturally biased as it is not representative of other cultures and can be criticised for imposed etic in assuming the findings are applicable to all cultures.
We can criticize the proposed role of EP as placing too much emphasis on the nature side of the nature-nurture debate, when in real life both interact with each other, thus it takes an unrealistic view of the role of EP and can therefore be considered reductionist.Endogenous pacemakers are internal ‘biological clocks’ that manage our rhythms.
In humans, the main biological clock is the suprachiasmatic nucleus (SCN), which is located in the hypothalamus. This controls circadian rhythms. Discuss the role of endogenous pacemakers and exogenous zeitgebers biological rhythms.
Endogenous pacemakers and exogenous zeitgebers are used to control biological rhythms.
The external environmental cues such as light or temperature are exogenous zeitgebers whereas the internal biological clocks that pace brain structures.
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Describe and evaluate research into circadian rhythms, with reference to endogenous pacemakers and exogenous zeitgebers (25 marks). Read this essay on Psychology: Outline and Evaluate Endogenous Pacemakers. Come browse our large digital warehouse of free sample essays. Get the knowledge you need in order to pass your classes and more.
Only at fresh-air-purifiers.com". Feb 17, · Endogenous pacemakers are internal ‘biological clocks’ that manage our rhythms. In humans, the main biological clock is the suprachiasmatic nucleus (SCN) which is located in the hypothalamus.
This controls circadian rhythms. The SCN is located above the optic chiasm. Endogenous Pacemakers and Exogenous Zeitgebers Essay Plan Here's an essay plan on the subject of endogenous pacemakers and exogenous zeitgebers.
Use it if you want, I chose these studies/explanations as they had the most information to write about.Download