What did Aschoff and Wever do?

The bunker experiment was a scientific experiment that began in 1966 to test whether humans, like other species, have an intrinsic circadian clock. It was started by Jürgen Aschoff and Rütger Wever of the Max Planck Institute for Behavioral Physiology and later taken over by Jürgen Zulley.

What did Aschoff and Wever do?

The bunker experiment was a scientific experiment that began in 1966 to test whether humans, like other species, have an intrinsic circadian clock. It was started by Jürgen Aschoff and Rütger Wever of the Max Planck Institute for Behavioral Physiology and later taken over by Jürgen Zulley.

What did siffre find?

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 a month earlier than it was.

What endogenous pacemakers and exogenous Zeitgebers are likely to influence your sleep wake cycle?

The most important endogenous pacemaker is the suprachiasmatic nucleus, which is closely linked to the pineal gland, both of which are influential in maintaining the circadian sleep/wake cycle.

What is social Zeitgeber theory?

Social Zeitgeber Theory of Bipolar Spectrum Disorders The Social Zeitgeber Theory (Ehlers, Frank, & Kupfer, 1988) suggests that life events disturb social zeitgebers (“time givers”), which, in turn, disturb biological rhythms, resulting in affective symptomatology in vulnerable individuals.

What did Stern and McClintock 1998 suggest about exogenous factors and the menstrual cycle?

Although it is an endogenous system, there are thought to be some exogenous factors. Stern and McClintock (1998) found that women’s menstrual cycles may start to synchronise as a result of female pheromones. The sample were 29 women with a history of irregular periods.

What did Siffres cave study show?

In subsequent experiments, Siffre observed that extended periods in temporal isolation led to a significant lengthening of the sleep-wake cycle. His research showed that a 48-hour cycle was common for cave dwellers, consisting of thirty-six hours of continuous activity and twelve to fourteen hours of sleep.

What did Siffre do in his cave study?

Discovering the human body’s internal body clock Whilst underground in the cave, Siffre had used a longline to telephone his research assistants to provide his opinion of the date and time, every time he woke up, ate, and went to sleep. Unknowingly, he had mostly remained awake for 24 hour periods before sleep.

How do endogenous pacemakers and exogenous zeitgebers work together to regulate the sleep/wake cycle?

Endogenous pacemakers are inbuilt biological clocks that regulate our behaviour, such as the sleep/wake cycle, stages of sleep and the menstrual cycle. Exogenous zeitgebers, such as lights or clocks, keep us regulated with the outside world.

What are the 4 biological rhythms?

How Biological Rhythms Work

  • Diurnal (night and day)
  • Circadian (24 hours)
  • Ultradian (less than 24 hours)
  • Infradian/Circalunar (1 month)
  • Circannual (1 year)

What is the Aschoff and Wever experiment?

Evaluation Supported by research by Aschoff and Wever (1976) they placed participants in an underground WW2 bunker, in the absence of exogenous zeitgebers. They found the participants still had their 24/25-hour circadian rhythms, which provides evidence for the role of internal endogenous zeitgebers.

What is Aschoff and Wever (AO1)?

(AO1) Evaluation Supported by research by Aschoff and Wever (1976) they placed participants in an underground WW2 bunker, in the absence of exogenous zeitgebers. They found the participants still had their 24/25-hour circadian rhythms, which provides evidence for the role of internal endogenous zeitgebers.

Does the removal of the exogenous zeitgebers affect the circadian rhythm?

Siffre (1972): investigated the effect of the removal of the exogenous zeitgebers (light) on the circadian rhythm of the sleep wake cycle. He spent 7 months in an underground cave with no natural light.

What are the weaknesses of Siffre’s study?

Another weakness is that Siffre’s study only accounts for biological influences on the circadian rhythm and so only represents the nature side of the nature-nurture debate. This provides an unrealistic view of human behaviour because in real life both nature and nurture interact with one another.