random brain facts. we’ve learned more about the brain in last 20 yrs than all time previous to...
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Random Brain Facts
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Random Brain Facts
• We’ve learned more about the brain in last 20 yrs than all time previous to that
• No two brains are identical
• Brain is mostly water (78%), fat (10%), and protein (8%)
• Living brain is so soft it can be cut w/ butter knife
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Random Brain Facts• The adult human brain weighs
about 3 pounds (1,300-1,400 gm)– Elephant brains = 6,000gm
– Cat brains = 30 gm
• Brain is ~2% of body weight, but consumes ~20% of body’s energy
• Total surface area of cerebral cortex = ~2.5 sq ft
• Bigger brains are not necessarily better
• Einstein’s was average size
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Random Brain Facts• Human brain has ~100,000,000,000
neurons• If all neurons were stretched end to end,
would reach to moon and back• Every second, brain receives 100 million
messages from the senses• ¾ of body’s neurons are in brain• On day you’re born, all brain cells in place
– They’re just immature – still developing• Explains why don’t have memories until ~3-4 y.o.
– Will not regenerate – this is all you get• (Recent research is challenging this idea…)
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Random Brain Facts• ~10 trillion pieces of information in
the brain
• There are 1,000 – 10,000 synapses for a typical neuron
• Human brain is capable of processing 10,000,000,000,000,000,000,000,000,000 bits of data per second
• Intelligence has nothing to do with number of neurons – it has everything to do with number of dendrite connections
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Random Brain Facts
• World record for time w/o sleep:• 264 hours (11 days) – Randy Gardner, 1963
• Unconsciousness occurs 8-10 sec after loss of blood supply to brain
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Random Brain Facts• Changing brain:
• 525 billion neurons in brain at 26 wks gestation
• 200 billion on day born
• 100 billion today
• Brain is ultimate “use it or lose it” machine– “neural sculpting” happens during REM
sleep
• Computer/TV has huge impact on brain• Recommend no TV/internet 0-2 yrs
– Sesame Street?
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Random Brain Facts
• Humans can process 400-600 words/min– Talk about 100-125 words/min
• Speaker needs to fill in gaps to avoid boredom, mind wandering
• Older people take longer to learn, but retain information as well as younger ppl
• Before age 5, brain is very plastic – can simultaneously adapt after injury– After age 5, severe, permanent damage more likely
• Ex – 5 y.o. boy w/ severe seizures had entire left hemisphere removed – paralyzed on right side, but scored above avg on intelligence tests, finished college & grad school – today an executive
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Random Brain Facts• Brain disorders cost
Americans more than $600 billion a year
• Alcohol use in teens devastating to the pre-frontal cortex
• Mature neuron has myelin sheath protection, young adolescent brain does not
– MN in top 5 for alcohol consumption
– Also top 5 for FAS cases
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WARNING:REALLY CORNY JOKES
AHEAD
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Bad brain jokes
• What does a brain do when it sees a friend across the street?– Gives a brain wave
• What did the hippocampus say during its retirement speech?– Thanks for the memories
• What did the right hemisphere say to the left hemisphere when they couldn’t agree on anything?– “let’s split”
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Bad brain jokes
• What happens if you break the brain scanner?– You will have a CATastrophe
• What kind of fish performs brain operations?– A neurosturgeon
• What do you call a skull without 100 billion neurons?– A no brainer
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Bad brain jokes
• When does a brain get afraid?– When it loses its nerve
• Why didn’t the brain want to take a bath?– It didn’t want to be brainwashed
• Why was the neuron sent to the principal’s office?– It had trouble controlling its impulses