Ultradian and Infradian Rhythms

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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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