PSY 4127 Lecture Notes - Lecture 4: Circadian Rhythm, Slow-Wave Sleep, Seasonal Affective Disorder
4 Jun 2018
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Lecture 3B: Variations in Sleep and Biological Rhythms
De Marina’s Observation (1729): the opening and closing of the mimosa leave persist in the absence of light. In
total darkness the cycle still exists but is slightly less than 24 hours.
Chronobiology: the study of biological rhythms.
3 Principle Biological Rhythms:
i. Ultradian Rhythms: cycles more than once per day.
ii. Circadian Rhythms: one cycle in 24 hours.
iii. Infradian Rhythms: less than once per day. Like a mensural cycle or seasonal affective disorder.
iv. Period: the duration of the rhythm (circadian, infradian, ultradian)
v. Amplitude: height of the wave.
vi. Acrophase: maximum temporal position.
vii. Nadir: minimum temporal position.
viii. Phase: relative position of the curve relative to some other curve or to time.
ix. Mesor: the average of all the phases.
Ultradian Rhythems
• altering NREM-REM
• Kleitman (1963) postulated the (BRAC) theory of Basic Rest Activity Cycle
• Kleitman was considered the father of sleep research
• postulated the basic sleep cycle
• peaks and performance also have 90 minuet cycles
• times during the day you are more active, more sleepy, and more aroused
• kind of backgrounds the REM sleep cycle running 24 hours a day
• digestion also peaks and slows down
Ultradian Rhythms
• 90 minuet (apprx.) for digestion, motor activity, vagalence, memory, attention, gastric concentration, oxygen
consumption, REM sleep generation.
• digestion peaks at around 5m when your brain is asleep
REM cycles slightly correlate with narcolepsy.
SWS (Broughten) — first 3 hours of sleep SWA dissipates
• in the early afternoon we also get a dip like this
• encourages a justified nap in the afternoon
• slow wave dissipation goes according to ultradian rythems
Leonardo Da Vinci
• legend has it that the master catnapped for fifteen minuets ever four hours, for a total of one and a half hours
of sleep a day.
• individuals use a similar attempt when crossing the atlantic
• he probably did not do this because then you would be very sleep deprived
• you would never get into slow wave sleep, you would never get quality sleep
• you would be very impoverished and sleepy all the time
• da vinci was a liar.
• mensural cycle fucks up temperature and than fucks up your sleep
Infradian Rhythms
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Lecture 3b: variations in sleep and biological rhythms. De marina"s observation (1729): the opening and closing of the mimosa leave persist in the absence of light. In total darkness the cycle still exists but is slightly less than 24 hours. 3 principle biological rhythms: ultradian rhythms: cycles more than once per day, circadian rhythms: one cycle in 24 hours, infradian rhythms: less than once per day. Ultradian rhythms: 90 minuet (apprx. ) for digestion, motor activity, vagalence, memory, attention, gastric concentration, oxygen consumption, rem sleep generation, digestion peaks at around 5m when your brain is asleep. Sws (broughten) first 3 hours of sleep swa dissipates: in the early afternoon we also get a dip like this, encourages a justified nap in the afternoon, slow wave dissipation goes according to ultradian rythems. Infradian rhythms: sleep difficulties as a result of the modification in the body temperature curve, associated stress also affects dream content, high progesterone lowers the thermoregular effect of melatonin.
