Random Brain Facts Random Brain Facts Weve learned
Random Brain Facts
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
Random Brain Facts • The adult human brain weighs about 3 pounds (1, 300 -1, 400 gm) – Elephant brains = 6, 000 gm – 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
Random Brain Facts • Human brain has ~100, 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…)
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 bits of data per second • Intelligence has nothing to do with number of neurons – it has everything to do with number of dendrite connections
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
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?
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
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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