Psychology 160: Evolution
Biological Clocks have a huge adaptive value.
It is adaptive to predict upcoming changes in a cycle.
Biological clocks measure time at nearly the same rate
Entrainment - internal mechanism to synch with environm
Cultural Transmission of behavior- transfer of information from individual to
individual through social learning or teaching.
Evolutionary Biologists and ecologist point of view: Genes were not only one way to
transmit information across generations, they
-fruit flies - per (period), tim (timeless)
Mammals- some genes seem to be the same - per, tim, clk
Clock Genes - per and Bees.
Honey bees, fruit flies, hamsters, and humans all have the same per gene functioning in pretty
much the same way
Clock Properties continued - Entrainment.
Entrainment: clocks have mechanisms that reset them as needed to keep them synched with
Lab Setting - can be reset by readjusting light/dark cycle.
WHY HAVE ENTRAINMENT?
- Biological clocks s
March 22, 2011
Biological clocks found in every non eukaryotic organism (non bacteria) in the world
They are used for adaptation to environmental cycles
Biological Clocks - Adaptive Value
- Earths Environmental cycles- constant, pred
PSYCH 160: EVOLUTION & BEHAVIOR
Derived Characters of Humans:
Standing and walking straight
Larger brains - capable of symbolic thought
20 species of extinct hominoids more closely related to humans than chimps
Dendrites receive input from other cells
Cell body (soma)
Axon - transmit electrical information from one cell to another
Cell Body decides if it will send a signal and when it does it sends it along the axon and transmits it
How is Culture Transmitted
- Vertical Transmission : parent to offspring
- Horizontal Transmission: peer to peer
- Oblique Transmission: adult (older than parent) to younger
Genetics or Culture of Both?
If the trait is genetic we would expect to see it in
Psych 160 Evolution Article Summary
Immune Reactivity and Attractiveness; Elisabeth Oberzaucher and Karl Grammer. 2010. Gerontology
According to the authors in the article, the main question being asked is whether attractiveness is