Disruption Of Biological Rhythms Essays

Zucker’s study where he damaged the SCN in rats to disrupt circadian rhythms was an animal study and may not apply to humans due to differences in anatomy. Therefore it may lack external validity and generalisation in humans. There are also ethical concerns when it comes to intentionally harming such animals although others may argue the benefits gained in understanding animal biology may lead to further understanding of humans. Such studies are typical of the biological approach to understanding human behaviour. They propose behaviour can be explained due to biological structures in the brain or hormonal activity. In truth our behaviour is much more complex and not so deterministic as such biological explanations propose. “Nurture” is evidently a strong factor too with environmental influences and exogenous zeitgebers clearly having a strong role in overriding internal biological clocks to some degree. On the other hand Miles et al demonstrated how a blind man who had a circadian rhythm of 24.9 hours struggled to reduce his internal pace no matter what exogenous zeitgebers were used highlighting some biological clocks may be more ingrained and not influenced.

The SCN is evidently not the only biological clock as other studies have shown that there are other oscillators in the body that appear to regulate biological rhythms through other means (temperature, light penetrating other parts of the body) and explaining circadian rhythms as simply dictated by the SCN and pineal gland connection is oversimplifying the workings of human biology which is far more complex.

Understanding circadian rhythms has real world applications particularly in the field of Chronotherapeutics. This is the study of how timing affects drug treatments and as the circadian rhythm affects digestion, heart rate and hormones among other functions, this can be taken into account when consuming drugs. For instance medicine that affect certain hormones may have no effect if taken when the target hormone level is low but more effective if taken when they are high. Aspirin for example is most effective in treating heart attacks and most effective if taken in the late evening as most attacks occur in the early hours of the morning.


This is an essay answer taken from the paper 2 ebook for AQA psychology A level students studying paper 2 as part of their AS and A level psychology course (new specification). You can download all the possible essay questions and model answers in this paper 2 ebook by clicking the image cover at the top.


How to reference/cite/link to this article: 

<a href=”https://www.loopa.co.uk/circadian-rhythm-biological-rhythms-aqa-psychology/”>Circadian Rhythms – Biological rhythms</a>

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