Biologica Approach & circadian rhymths Flashcards

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1
Q

What problems can occur from jet lag and shift work ?

A

(3) poor attention , impaired reaction time & reasoning skills

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2
Q

What happens when you have an intake of alcohol?

A

Decrease time taken to fall asleep & lessens amount of sleep

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3
Q

Describe the SCN ?

A

-main endogenous pacemaker, neurones project from SCN to pineal gland which releases melatonin

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4
Q

How to measure sleep ?

A

EEG-electroencephalogram-brain activity EOG-eye. EMG-muscle activity. ECG-heart

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5
Q

What is endogenous pacemakers ?

A

Internal biological rhythms , SCN

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6
Q

Describe the external factor light ? (Zeitgebers)

A

Light can be dectected through other areas of body not just eyes and can be a powerful zeitgeber

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7
Q

What happens when you have an intake of nicotine ?

A

Addictive effect of nicotine means that smokers tend to wake in night craving cigarettes (30min-2hr)

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8
Q

What happens when you have frequent shift patterns ?

A

Results in more negative effect , (5) - fatigue ,sleep ,memory loss , mood swings ,reduced productivity and low staff morale

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9
Q

Examples of circadian rhythms ?

A

-sleep /wake cycle , appetite for food ,temp & hormone levels

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10
Q

What are circadian Rythms ? What they do /purpose?

A

Body has a way of keeping track of time (circadian clock) , called circadian rhythms -body’s natural processes that vary over a 24 cycle

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11
Q

Where is the hormone sleep released ?

A

The sleep hormone melatonin is released from the hypothalamus (SCN)

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12
Q

What is sleep ?

A

Sleep can be defined as a state of reduced conscious awareness during which the body is less active and less responsive to the outside world

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13
Q

What is the fourth stage of sleep ?

A

Sleep gets gradually deeper & delta waves become more common which dominate EEG readings only loud noise /shaking will wake u up (body temp & BP decreases)30 mins

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14
Q

What is the second stage of sleep ?

A

-20 mins becomes less responsive however woken might not realise sleeping .sharp spikes of electrical activity called sleep spindles ,theta waves ,muscles relax , breathing heart rate drop

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15
Q

What did Philips & danner 1995 find (smoking)?

A

That smokers are more likely than non smokers to report falling /staying trouble sleeping

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16
Q

What is sleep influenced by?

A

Sleep is influenced by brain,hormones & light (3) external & internal factors

17
Q

What is siffre study 1975?

A

When people are deprived of zeitgebers they still maintain a clinical rythms extends 25hr ( external /internal unison)

18
Q

What did Campbell & Murphy 1998 find ?

A

They found that shining light on the back of knees could alter circadian rythms

19
Q

What did Luce & segel 1966 find ?

A

People who live in artic circle maintain a constant sleep pattern despite 6 months of constant darkness

20
Q

What is the third stage of sleep ?

A

15 mins - the EEG begins shoe delta waves & gradually increase very unresponsive to the environment & hard to wake up & body makes repairs

21
Q

What did Schwartz et al 1995 study ?

A

He studied basketball teams (w/e coast of America)? East coast teams who were playing on wc won more games than wc playing ec

22
Q

What was menaker et al 1978 study ?

A

Cut the SCN (brains internal clock) from a hamsters brain & found a disruption to hamsters circadian rhythms

23
Q

How would chemicals treat sleep circadian rythms ?

A

Mealtion supplments can help to reset the body clock

24
Q

What does biological approach believe ?

A

Biological approach believes is a result of systems I body 1) genes 2) biochemical imbalance & 3) neurotransmitters problems

25
Q

What are 3 examples of stimulants /depressants ?

A

1) alcohol 2) caffeine 3) nicotine

26
Q

Which zeitgebers is more powerful light of social factor ?

A

Social factor can override light as a powerful zeitgebers

27
Q

What happens when you go from east to west ?

A

When. You go from E-W? Your temp & metabolic rate is its peak making it difficult to sleep

28
Q

Describe exogenous zeitgebers?

A

External factors which affect our biological rhythms cues such as light or social factors, alcohol & caffeine

29
Q

What happens when you go from e-w & w-e ?

A

E-w- gain time & w-e- loose time

30
Q

How can light & food treat circadian rythms ?

A

Light = SCN is sensitive to light & food= fasting can alter biorhythms & therefore help counter tact jet lag

31
Q

What happens when you have a intake of caffeine ?

A

Little caffeine increases wakefulness & to much causes insomnia & anxiety & causes jitters & headaches & racing heart

32
Q

What is the 5 stage of sleep ?

A

Occurs at 90 mins , EEG- becomes very mixed in comparison to slower felt waves before , eyes be rapidly moving however body does not moves (paralysed )lasts about 10 mins & brain very active & increase heart Rate , breaking and bp & temp

33
Q

What is the 1st stage of sleep ?

A

Stage between wakefulness & sleep , your easily woken , hear noise & eyes are closen but occasionally flicker “ u are drifting off” & alpha waves , heart rate ,muscle tension & temp drop & may hallucinate be

34
Q

Strengths of biological approach ?

A

Individual differences- the BA approach has proved successful in showing that genetic factors play a role in explaining individuals are more likely than others to develop certain mental disorders.
Applications- the BA approach has proved valuable in terms of use of chemotherapy to treat mental disorders. In addition genetic counselling for prospective parents in an outcome of our understanding of the links between genes / behaviour - for example they carry a genetic susceptibility for a fatal disease - however genetic counselling raises many ethical probs in relation to the concept of designer babies

35
Q

Weaknesses of biological approach ?

A

Reductionism - the reductionist nature of the BA is over simplified in that we cant obtain a complete understanding of human behaviour by focusing on biological factors. For example various psychologist , social and culture factors influence the development of mental dissorders and these factors are ignored within BA.
Nature - nurture - the BA exaggerates the importance of genetic factors in determining factors while minimising the importance of environmental factors are more appropriate for some kinds of behaviour (vision) than other kinds of where higher order thinking is involed (emotional reasoning) biological explanations on their own are usually inadequate.