Biopsychology: Biological Rhythms - Endogenous.

Exogenous Zeitgebers Essays

There is research support for the role of melanopsin. Skene and Arendt (2007) claimed that the majority of blind people who still have some light perception have normal circadian rhythms whereas those without any light perception show abnormal circadian rhythms.This demonstrates the importance of exogenous zeitgebers as a biological mechanism and their impact on biological circadian rhythms.

Exogenous Zeitgebers Essays

As outlined above, exogenous zeitgebers influence biological rhythms: these can be described as environmental events that are responsible for resetting the biological clock of an organism. They can include social cues such as meal times and social activities, but the most important zeitgeber is light, which is responsible for resetting the body clock each day, keeping it on a 24-hour cycle.

Exogenous Zeitgebers Essays

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Exogenous Zeitgebers Essays

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Exogenous Zeitgebers Essays

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Exogenous Zeitgebers Essays

We can confirm that in the absence of light the SCN becomes free-running and it is desynchronised with exogenous zeitgebers. Due to the temperature remaining consistent it is implied that different pacemakers in the brain for the sleep-waking cycle SCN and temperature are in a different place. Overall it can be concluded that humans are very much biologically determined, even if the external.

Exogenous Zeitgebers Essays

The sleep wake cycle is seen as being controlled by external cues also known as exogenous zeitgebers such as light, clocks, food and social interaction which may be the reason why we go to sleep at night and wake up during the day. However, a famous study was carried out by a psychologist called Michel Siffre, he investigated whether the sleep wake cycle is free running and unaffected by.

Exogenous Zeitgebers Essays

Research has been conducted to investigate the external cues (exogenous zeitgebers) like light on biological rhythms (e.g. sleep-wake cycle). Siffre (1975) found that the absence of external cues significantly altered his circadian rhythm: when he returned from an underground stay with no clocks or light, he believed the date to be earlier than it was. This suggests that his 24hr sleep-wake.

Exogenous Zeitgebers Essays

Endogenous pacemakers (EP) and exogenous zeitgebers work together in creating a cycle for humans, regulating differing biological rhythms. EP’s are internally caused usually by the body, and are distinct from external causes such as seasons, light, and clocks. An example of endogenous pacemakers would be the suprachiasmatic nucleus (SCN). This is a small group of cells in the hypothalamus.

Exogenous Zeitgebers Essays

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Exogenous Zeitgebers Essays

Model answers for the following; Discuss research into circadian rhythms. In your answer refer to research evidence (16 marks) Describe and evaluate research into infradian and ultradian rhythms (16 marks) Describe and evaluate research into the effects of endogenous pacemakers and exogenous zeitgebers on the sleep wake cycle (16 marks) All are typed onto one page thus producing a realistic.

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