Environmental factors influencing biological rhythms tend to change slowly, allowing the internal pacemakers to keep up. However, if the zeitgebers change quickly, problems can occur. Such problems include poor attention, slow reaction time and impaired reasoning skills and can arise from two features of modern life; shift work and jet lag.
Shift Work This can involve working times where people would normally be asleep, and being asleep at times when people are normally awake. This causes a breakdown in the usual coordination between internal biological clocks and external cues. This requires a drastic change to.
These are rhythms with a period of greater than a day. The menstrual cycle is an example of an infradian rhythm. Infradian rhythms that occur as a result of seasonal changes, for example, migration and hibernation are called circannual rhythms. The menstrual cycle has a period of about 28 days, although the timing can vary according to environmental factors.Evaluating Circadian Rhythms. Research Support: Research has been conducted to investigate circadian rhythms and the effect of external cues like light on this system.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.SAD can be discussed in an essay on disruption of biological rhythms. The menstrual cycle Obviously a cycle that lasts about one month, so this cycle is infradian. Like other rhythms, the menstrual cycle appears to be under the influence of both internal (endogenous) mechanisms, and external zeitgebers.
Discuss the role of endogenous pacemakers and exogenous zeitgebers in biological rhythms. (25 marks) Describe and evaluate psychological research into sleep disorders (e.g insomnia, apnoea, narcolepsy) (25 Marks) Discuss psychological research into the disruption of biological rhythms (e.g jet lag and shift work) (25 marks).Read More
Circadian rhythms follow a 24-hour cycle (e.g. the sleep-waking cycle) and are controlled by an interaction of: Endogenous pacemakers (EP’s). Internal biological structures that control and regulate the rhythm. Exogenous zeitgebers (time-givers) (EZ’s). External environmental factors that influence the rhythm.Read More
The circadian rhythm is mostly comprised of a group of cells called the suprachiasmatic nucleus (SCN), which is located in the hypothalamus. It turns out that we all have a built in 24-hour day.Read More
Describe and evaluate research into circadian rhythms (24 marks) Circadian rhythms are biological cycles that last around 24 hours such as the sleep-wake cycle. It is suggested that this circadian rhythm is free running and controlled by endogenous pacemakers (internal body clock).Read More
Jane Pilcher (1995) - Childhood is seen as a clear and distinct life stage where children occupy a different status than adults. This is emphasised in several ways, such as laws regulating what children are allowed, required or forbidden to do.Read More
Biological rhythms are cyclical activities that are a basic characteristic of animal life. In humans, we see the circadian rhythm, or the rest-activity cycle, controlled primarily by light.Read More
The biological clocks of the circadian timing system coordinate cellular and physiological processes and synchronizes these with daily cycles, feeding patterns also regulates circadian clocks. The.Read More
In order to understand more fully the disruption of rhythm and time perception caused by trauma, it is useful to explore the role of circadian rhythm, light, and the pineal gland.. S. L. (1990.Read More
A biological rhythm is one or more biological events or functions that reoccur in time in a repeated order and with a repeated interval between occurrences. Description Biological rhythms are the ways that organisms adapt and live with the environmental rhythms around them, such as the spin of the earth, the movement of the earth around the sun, and movement of the moon around the earth.Read More
Biological rhythms have always been considered to be disrupted in depression. In the seminal paper by Akiskal and McKinney ( 2 ) it has been concluded that depression is related to hyperarousal, because depressive patients have lower threshold for awakening, rapid eye movement (REM) sleep disorders and loss of delta waves related sleep, which is the deepest stage of non-REM sleep.Read More