PSY 4327 Lecture Notes - Lecture 2: Pineal Gland, Synchronicity, Light Therapy

• School: University of Ottawa
• Department: Psychology
• Course: PSY 4327
• Professor: Kathleen Biard

Document Summary

Lecture 2b: variations in sleep and biological rhythms. History: de marian"s observations (1729)- the opening and closing of the mimosa leaves persist in the absence of light, candolle (1832)- in total darkness the cycle is shorter than 24 hours. Terminology: chronobiology: the study of biological rhythms, 3 principal biological rhythms, ultradian rhythms (more than once per day, circadian rhythms (about 24 hours) Infradian rhythms (less than once per day: basic rhythm (the most studied): circadian (=24 hours, circa diem almost a day. Ultradian rhythms: alternating sws- rems, rems= rem-on, sws= rem-off, similar alternations (sleep-wake) n other species, 1963- kleitman postulated the (brac) theory < basic rest activity cycle , other postulated 90 minutes rhythms, rems. Ultradian rhythms: sws (broughton, 1975, first 3 hours of sleep: sws dissipates, during this period, vigilance is at its lowest. In the early afternoon (1-3 o"clock pm: mid-afternoon dip.