Biopsychology. Or Everything you’ve ever wanted to know about sexual selection but were afraid to ask. Interactions. Definitions of interactions: The whole is greater than the sum of its parts The relationship between the variables is multiplicative instead of additive
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Everything you’ve ever wanted to know about sexual selection but were afraid to ask
Definitions of interactions:
The whole is greater than the sum of its parts
The relationship between the variables is multiplicative instead of additive
The effectiveness of one intervention is contingent upon another intervention
Ya Ya Sisterhood
Survival of the fittest
If other organs such as the stomach and spleen were evolutionarily advantageous, why not the brain?
Men – Looking to “spread their seed”
Women – Looking for a mate who will care for children
Post Hoc Theorizing Game
He who hesitates is lost
Look before you leap
Birds of a feather flock together
Heritability Estimates – The proportion of the total variance in a trait that is attributable to genetic variation within a group.
Doing Crosswords: .55
Liking Sweets: .65
Playing Chess: .62
Time Reading: .43
However, it is generally accepted that behavior is determined by a nature x nurture interaction
e.g. A person with a genetic predisposition towards alcoholism won’t become an alcoholic if he never takes a sip of liquor
Tone of Voice
1) Nervous that they’ll get caught
2) Guilty about lying
How to trick a polygraph:
How to trick a polygraph:
How polygraphs REALLY work
Criminals get scared by the prospect of being detected, and they confess their crimes!
Other areas that psychophys can study
The Sleep-Wake Cycle
Free of all time cues, the human day averages about 25 hours
Body temperature, and hormone levels follow this cycle
Regulated by the hormone melatonin
Since we have a ~24 hour cycle, the longer we stay awake, the less we sleep!
Average Hours Sleeping per Day
Giant Sloth: 20 hours
Brown Bat: 19 hours
House Cat: 14 hours
Jaguar: 10 hours
Human: 8 hours
Elephant: 3 hours
Horse: 2 hours
The Randy Gardner Case
Mood Disturbance common
Complex Cognitive tasks unaffected
Dull cognitive tasks are difficult
Longitudinal partial sleep deprivation causes more difficulty than short term total sleep deprivation
Experimental rats die after several days.
Yoked Rats not affected.
Increasing sleep efficiency after deprivation
Da Vinci’s sleep strategy
15 minute nap every 4 hours
Total of 1.5 hours of sleep per day
Replicated by Stampi, (1992) in a lab.
Takes 2 weeks to adjust, during which time...
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