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The human brain expends up to 80 percent of its energy on synaptic activity, constantly adding and strengthening connections in response to all kinds of stimulation, explains study author Chiara Cirelli, associate professor of psychiatry. Given that each of the millions of neurons in the human brain contains thousands of synapses, this energy expenditure “is huge and can’t be sustained.”
Läs mer: Brain connections strengthen during waking hours, weaken during sleep | Science Blog