This is actually unknown and all estimates are based solely on conjecture and very little experimental evidence for what a maximum usage would be and how to measure any given usage at any time.
The question also means different things at different times. So, more specificity would go a long way. For example, some people want to know how much of the human brain can be used at any given time
While others ask, what percent of the human brain, possible connections, and information tracts can be used total and what is the typical human percentage of those.
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Contrary to the popular myth, humans already use 100% of their brain. Different regions of the brain are active at different times, and the brain as a whole is constantly functioning, even during rest.
100% of the brain. If we only used 10% we would have the thinking power of a sheep.
Anyone who quotes the "ten percent" figure is probably correct ... regarding themselves.
It is currently believed that the brain is made up of 77-78% water.
The average human brain is composed of about 75-80% water. This high water content helps cushion and protect the brain, as well as facilitate the transport of nutrients and waste products.
The human cerebral cortex accounts for about 80% of the total brain mass. It is responsible for higher brain functions such as thinking, memory, and voluntary movement.
The human brain is composed of about 60-70% water. Water is essential for maintaining healthy brain function, serving as a cushion for protection and a medium for nutrient transport. Dehydration can lead to issues such as headaches, fatigue, and difficulty concentrating.
The brain only represents 2% of our total body weight. Interestingly, it consumes 25% of the body's oxygen.