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
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
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
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
Anticipation o Modern
Coordination of reproduction and social activity
o Mouse entrainment and free run
The mouse starts using the running wheel earlier and earlier without any
influence from the outside world. Th