Ultradian and Infradian Rhythms
- Created by: Charlotte Thornton
- Created on: 27-12-12 21:16
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ULTRADIAN RHYTHMS
SLEEP STAGES & BRAC CYCLE
AO1
- Duration of less than a day
- One example being sleep stages
- Stage one and two; Light sleep, Beta-Alpha-Theta waves ( waves begin to slow down)
- Stages two and three; Slow wave sleep, delta waves (repair work occours here and growth hormones generally released)
- Stage five; Paradoxical sleep (Brain and eyes active, body paralysed)
- First four stages are Non-Rapid Eye Movement sleep, final stage is Rapid Eye Movement sleep.
- Each cycle is roughly 90 minutes
- Located within the Basic Rest-Activity Cycle (Circadian rhythm)
- FRIEDMAN AND FISHER - noted clear 90 minute cycle in eating and drinking behaviour (Can be argued that as used paitents from a psychiatric unit, they were observing a certain personality type, ergo can we generalise?)
AO2
- General assumption that REM = dreaming
- DEMENT & KLEITMAN proved that sleepers woken when displaying REM brain waves weren't always dreaming. Also that dreaming occours outside REM sleep
- HOBSON & McCARLEY suggest that dreams are psychological read-out of random electrical signals, typical of REM sleep
- This is, however, based on the assumption that REM activity always equates to dreaming.
- BRAC cycle important as it ensures biological processes work in unison
INFRADIAN RHYTHMS
MENSTRUAL CYCLE
AO1 POINTS
- Driven by fluctuating hormone levels
- Function is to regulate ovulation
- PITUITARY…
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