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OCR AL Psychology (New): Research methods H167/1 & H567/1 - 15 May & 07 Jun 2017 Watch

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    has anyone had any papers remarked?
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    This is from the topic relationships from OCR A2 Psychology.
    Can someone give me feedback, or improvements on the paragraphs please, and what you would give me out of 10. Im still kinda iffy on writing eval points. Thank


    Animal study to support the influence of SCN: (EVALUTATION POINT)

    The influence of the SCN has been demonstrated in studies involving animals. Decoursey et al. destroyed the SCN connection of 30 chipmunks, returned them to their natural habitat, and observed them for 80 days. Their sleep/wake cycle disappeared and they were killed by predators. Although this study shows that the role of SCN in establishing the sleep/ wake cycle, it uses chipmunks, which would not be appropriate to generalize to humans. Instead, a chimpanzee would have been a more appropriate choice, due to their DNA being almost identical to humans. However, there are ethical issues in using this method as animals were exposed to considerable harm, and subsequent risk. Therefore, this study is not a reliable source of determining the influence of SCN.


    Light affects the sleep wake cycle (EVAUATION POINT)

    There is research support to show that light affects the sleep/wake cycle. Campbell and Murphy demonstrated that light may be detected by skin receptor sites on the body, even if the same information is not received by the eyes. They woke 15 participants up at various times, and a light pad was shone on the back of their knees. The researchers found that they produced a deviation in their sleep/wake cycle by up to 3 hours in some cases.This shows that light receptors on the skin were able to determine the general time of day just with the use of light. A limitation of this study is the small sample of participants, which affects the reliability of results because it leads to a higher variability, which may lead to bias. Moreover, the light used was artificial light. If natural light was used, there may have been a difference in results. This questions the validity of the results, and whether they can be generalized to everyone.


    Influence of exogenous zeitgebers may be overstated (EVALUATION POINT):

    There is research to show that the influence of exogenous zeitgebers may be overstated. Miles et al. recounted the story of a blind man from birth, whose circadian rhythm was 24.9 hours. Despite exposure to social cues, his sleep/wake cycle could not be adjusted, and so he had to take sedatives at night to keep up with the 24 hour pace. This shows that external cues may not be as significant in regulating the circadian rhythm. However, a limitation of this study is that it only included one person, which is not generalizable to the rest of the population. Furthermore, this was a recount by Miles. A recount may not have accurate recall, and so he may have given inaccurate information. Therefore, this validity of this study is questionable. There have been other studies, with larger samples, to show that exogenous zeitgebers have an influence on the sleep/wake cycle such as Siffre, Ashoff and Wever.
 
 
 
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