PSYA3

Describe the main circadian rhythm

The main circadian rhythm is the sleep/wake cycle which occurs every 24 hours. It is governed by both exogenous zeitgebers such as light + by endogenous pacemakers such as the SCN. Our free-running cycle is about 24-25 hrs long.

1 of 10

Describe 2 practical applications/implications into ultradian/infradian rhythms.

The menstrual cycle has been used a defense in court for a murder trial and she claimed it was equal to an illness (Johnson). Chronotherapeutics can be used to help people with seasonal affective disorder (Eastman et al)

2 of 10

Describe 2 animal studies into endogenous pacemakers and exogenous zeitgebers.

Morgan made one group of hamsters have a 'mutant' sleep/wake cycle and then transplanted their SCNs to new hamsters, the new hamsters showed mutant rhythms, Decoursey et al removed the SCN from 30 chipmunks and compared their survival to controls.

3 of 10

Outline how shift work can be disruptive to sleep.

Shift work means that people have to sleep during the day time, this can lead to lower quality sleep due to noises and lights. Shift work has also been shown to increase risk of organ disease by 45%

4 of 10

Describe and evaluate Kripke's study on sleep

1 million people studied, showed that 10 = 30% increased - however, this study did not show cause and effect (you may need to sleep more if you are ill)

5 of 10

Describe the case study of Peter Tripp

Peter Tripp was a student who stayed awake for 200 hours. He experienced a few delusions and paranoia but nothing worse than this. His brain scans looked as though he was sleeping though so he may have got rest for his brain. (BUT highly motivated)

6 of 10

Name 5 evaluative points for the evolutionary approach

Zepelin et al, Capellini et al, Alison+Chicchetti x2, Horne et al and unilateral sleep

7 of 10

Outline why it is important to research Insomnia

Tiredness accounts for 1500 deaths a year and 200,000 accidents. Moreover, 3 hours less sleep has been shown to be equivalent to moderate levels of alcohol when driving.

8 of 10

Name 3 explanations for Narcolepsy

HLA (gene for HLA production may be faulty), Hypocretin (neurotransmitter which regulates sleep/wake cycle), Rem intrusions (cataplexy is similar to REM sleep)

9 of 10

Give 3 evaluative points for Sleepwalking

Lecendreux et al showed that MZ twins have concordance rates of 55% but DZ just 10-15%, Zadra et al showed that sleep deprivation increased sleep walking from 50 to 90%, Sleepwalking is not dreaming as these are in different sleep stages

10 of 10

Get Revising

PSYA3

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Similar Psychology resources:

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Related discussions on The Student Room

Similar Psychology resources: