• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Describe and evaluate the recovery/restoration theory of the function of sleep.

Extracts from this document...

Introduction

Psychology Essay Describe and evaluate one theory of the function of sleep (24 marks) Recovery/ Restoration is one theory on the functions of sleep. This theory is based on the concept that sleep is needed to save energy and to allow restoration of tissue. Research evidence that supports this theory focuses mostly around physiological benefits of sleep. Alison and Cicchetti (1976) surveyed 39 mammalian species to work out the amount of time spent in slow wave sleep (SWS) and in REM sleep. It was found that body weight (which correlates with metabolic rate) was the best indicator of the amount of SWS needed. Oswald's (1980) findings can relate to this; he found that during SWS growth hormones are released from the pituitary gland, stimulating protein synthesis; which is essential for tissue repair. ...read more.

Middle

This is supported by studies on insomniacs, who tend to be more worried and anxious than people who sleep normally. However, in these cases it is difficult to establish whether it is people's concerns and worries disrupting sleep or disrupted sleep-causing worries. Additionally, Naitoh (1975) discusses various studies concerning the effect of one nights sleep deprivation on a person's mood. The effects were consistently negative (sleep deprived individuals described themselves as less friendly, good natured and relaxed than those who had not been sleep deprived. Research on long-lasting sleep deprivation in humans has shown that after a period of sleep deprivation, the majority of 'extra time' spent in sleep is in stage 4 SWS and REM sleep, as shown in the case of Randy Gardner who after staying awake for 264 hours, spent 15 hours ...read more.

Conclusion

However, there is no correlation between amount of physical activity and amount of sleep needed. Furthermore, as animals were used in many of the studies, the results could have been due to stress of participating in the experiment and the methods used to keep the animals awake (ethical issues); as opposed to sleep deprivation. In conclusion, as Home suggested, sleep may serve different purposes for different species, so while this theory may be sufficient in explaining the functions of sleep in humans, we cannot generalise to all species. For example, in reptiles the cerebral cortex, from which EEG recordings are obtained, is poorly developed and so we cannot study reptilian sleep. Whereas sleep is clearly identifiable in birds and mammals, suggesting it does have an important function. Also, due to differences between species, no single theory does provide a more thorough and well-developed account of sleep than the adaptive or evolutionary theory. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Physiological Psychology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

4 star(s)

Reasonable level of knowledge and evaluation.

4 Stars

Marked by teacher Stephanie Duckworth 24/10/2013

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Physiological Psychology essays

  1. Marked by a teacher

    Describe and Evaluate Bowlbys theory of attachment. (12 marks)

    3 star(s)

    Bowlby developed Freud?s idea that a child?s first relationship is a ?prototype? for later relationships, and he proposed that each child forms a mental representation of its first attachment, known as an ?internal working model?. This is called upon when forming later relationships, so if for example a person had

  2. Marked by a teacher

    Outline and Evaluate the Biological Treatments of OCD

    3 star(s)

    In addition to this, the drugs may only treat the symptoms of the OCD not actually the cause and therefore are not actually treating the problem. In addition to this, side effects are common when taking these anti depressants the most common being constipation, suicidal thoughts, sexual dysfunction and increased anxiety.

  1. Marked by a teacher

    Discuss the nature of sleep, including two explanations of the functions of sleep

    3 star(s)

    study cannot be generalised to humans because it involves animals which have different physiological processes to humans.

  2. Marked by a teacher

    'Life changes, no matter if they are positive or negative, are always a source ...

    3 star(s)

    new job, marriage, divorce, birth of a child, death of a family member, travel, promotion, etc. The total score for a person is calculated as the sum of all changes that the person experienced, multiplied by their relative weights. Using this scale, it was shown that individuals with high life change scores are significantly more likely to fall ill.

  1. Discuss theories of sleep

    Similarly to the ?protection? theory, this theory also states that the night time would have been an unproductive period for attaining food. Hence, humans tend to sleep at night to conserve resources by lowering the metabolic rate. It is also proposed that others factors affect sleep such as the higher

  2. I will talk about the history and what the psychological and physical aspects of ...

    For example, ?Major hospitals use trances for factures, cancer, burns and speeding surgery recoveries?-?The Wall Street Journal? by Michael Waldholz ? hypnosis goes mainstream? 2003 Many internal and external factors affect how we think, feel and behave. Relaxation when used in hypnotherapy is an important tool as it focuses on the mind and relaxing the body?s muscles.

  1. In this essay I will cover explanations of dreams including Freuds theory of repressed ...

    Crick and Mitchison (1983) explain that we shouldn?t try to recall dreams as these are what our brains are trying to remove and by recalling them they are remaining in our brains. Contrastingly psychoanalysts like Freud explain that it is important to remember our dreams as they could help us understand our subconscious.

  2. Unit 1 psychology revsion notes (memory, attachment, research methods)

    reading aloud * Could do both easily simultaneously * STM must have different components that can process more than one type of information Baddeley et al STM must have different components * Dual task * Tracking task and visual imagery task * Poor at the dual task performed alone *

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work