Circadian Rythms Flashcards by Scarlett Daniels

Q

Define

A

Lasts 24h

To meet varying dmds of body thoughout day

E.g.
Sleep- wake

Hormone production

Body temperature

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Q

Sleep wake-cycle

A

Light x dark- signals when to sleep

Strongest sleep drive:
2-4 am
1-3 pm

Homeostasis - need energy = sleep

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Q

Hormone production

A

Pineal gland secretes melatonin

Activates synapses in brain

Encourages sleepiness

Dark ++
Light –

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Q

Body Temperature

A

Indicator of sleep wake

Lowest 4am
Highest 6pm

Varies 2 degrees

Temp Inc causes alertness

GULTA 1991- IQ test best 7pm Vs 9am

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Q

Siffre

A

Cave studies

Deprived of natural light

Bio rythms 25h

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Q

AO3: ✅ Practical Application

A

Applys to shift work

Boivin 1996

Less mistakes if avoid sleep drive

Saves money

More efficient

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Q

AO3: ✅ Drug treatments

A

Chronotheraputics

Timing of drug doses

Cost Effective

Improves Q of L

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Q

AO3: ❌ Indiv diffs

A

Cycles vary 13-16h

Duffy- owl X lark

Qu necessity of research

Not generalisable

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Q

AO3: ❌ ex variables

A

Poor control

Siffre used artificial light

Reduces validity as light x dark alter bio clock

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