Ultradian Rhythms 0.0 / 5 ? PsychologySleepA2/A-levelAQA Created by: Keyleigh-StormCreated on: 29-05-16 21:20 8264101795 Across 1. The ----- rest-activity cycle (BRAC) - the 90 minute sleep cycle is located within a 24-hour circadian rhythm, so it would make sense to find that this 90 minutes clock was also ticking throughout the day. (5) 4. Who observed eating & drinking behaviour in a group of psychiatric patients over periods of 6 hours & detected a clear 90 minute cycle in eating and drinking behaviour? (8, 3, 6) 5. Stages 3 & 4 = characterised by even slower ----- waves (slow wave sleep) - very hard to wake someone up, although person isn't unconscious - physiological 'repair work' is undertaken & growth hormones are produced. (5) 9. One issue with studies on REM sleep is the assumption that it is -------- sleep. (8) 10. The first four stages of sleep are called NREM sleep (----rapid eye movement). (3) Down 1. The awake brain produces a typical pattern called a ---- wave. (4) 2. In REM sleep there's fast, desynchronised EEG activity resembling the awake brain - called 'paradoxical sleep' because the brain and eyes are active but the body is ---------. (9) 6. The basic rest-activity cycle shows that sleep stages are part of a continuum & the importance of this 90 minute rhythm is probably as a form of timing to ensure that the biological processes of the body work in ------. (6) 7. The fifth stage of sleep are called --- sleep, so called because of the accompanying movements of the eye beneath the closed eyelids. (3) 8. Within the sleep cycle an example of ultradian rhythms exist - the ---- stages of sleep. (4)
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