Paper 2 Flashcards
Circadian rhythms
Sleep-wake cycle
Exogenous cycle
Ultradian rhythms
Just sleep
Endogenous cycle
Internal influences
Hormones = adrenaline, ACTH releases cortisol, pineal gland releases melatonin
External influences
Light, time, environment (stress, eat, drink, medication)
Zeitgebers
Zeitgebers = external cues that synchronise the biological clock
Strengths and weaknesses of internal influences:
+SCN removed from hamsters = sleep-wake patterns random
+Miles, blind man = 25hr circadian rhythms
+Li-You Chen = sleep deprived rats, reduced melatonin
-animal studies
-individual differences to being blind
Strengths and weaknesses of external influences:
+practical applications for understanding body clocks in humans
+Skene found light is main bodily rhythm
-Siffre found 48hrs sleep-wake
-Sleep deprivation studies are unnatural
Insomnia
Caused by lifestyle (jet lag, working shifts), medication (antidepressants), food and drink, health conditions
Narcolepsy
1/2000
Cataplexy, hallucinations, fall asleep uncontrollable, EDS, sleep paralysis
Hypocretin keeps us awake, cells in hypothalamus produce hypocretin are damaged or missing
Id, supergo, ego
id = i want Superego = you can’t have Ego = balance
Manifest content
Story
Latent content
Meaning of dream
Dreamwork
Keeps unconscious thoughts hidden
Condensation
Many ideas appear as one
Displacement
Something unimportant seems important