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Biological Rhythms Lecture 1.docx

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University of Toronto St. George
Martin Ralph

PSY397 Biological Rhythms M11-1 pm, W 11-12 pm  Biggest problems people have: whether to add or subtract, sun rises in east and sets in the west (in s hemi also)  Tt1- 20%/ Tt2- 35%/ Final: 45%  Book: Intro to Bio Rhythms: A primer on the Temp Organisational of Life (2006) Koukkari and Southern  It’s online!!!! Added readings are highly recommended and presented on Blackboard  How do we deal with time in everyday life? o Time/duration estimation  This allows us to predict, understand, and prepare for the day/seasons/etc. o Time memory  The ability to remember when things happened o Time perception o Biological rhythmicity  Why do we need to be able to predict the coming of winter, the change of seasons? o We don’t want to take risks in presenting ourselves to predators or getting food, so it’s important to be able to predict when the predators are going to be around. o Sunlight provides energy but also damages DNA, therefore we need to behave according to the placement of the sun during the day  Natural Selection o Differential reproduction o Adaptation and optimization o Even the most “primitive” species have cellular mechanisms that protect organelles and DNA from damage from light.  How much energy does an organism need to expend? How much risk does an organism need to take? o A large part of it is simple organisation; the anticipation needed to wake up/sleep/etc. that also anticipates what’s going to happen in the outside world. o Over time, organisms have developed mechanisms to exploit these rhythms  Circadian – about a day  Circannual – about a year  Circalunar – about a month  Circatidal – about 4 hours o All organisms have these mechanisms, especially tidal organisms  Biological uses of bio rhythms o Ancient  Organisational  Anticipation o Modern  Migration  Orientation  Seasonality  Coordination of reproduction and social activity  Rhythms o Mouse entrainment and free run  The mouse starts using the running wheel earlier and earlier without any influence from the outside world. Th
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