# Forums

## Factoid: "Brain Power" (Some light humor...)

Did you know?

The average human brain consumes energy at the rate of about 12.6 watts, which about 20% of the consumption rate for the whole body at rest, which is 63 watts.
The brain apparently has no switches and consumes energy at that approximate rate day or night, awake or asleep and possibly even during a coma.

I suspect some are "dim-wits," and as a result consume less than 12w of power....

Happy Monday! :-)

Edit: Source; Scientific American

https://www.scientificamerican.com/article/thinking-hard-calories/

The Math

—Resting metabolic rate: 1300 kilocalories, or kcal, the kind used in nutrition
—1,300 kcal over 24 hours = 54.16 kcal per hour = 15.04 gram calories per second
—15.04 gram calories/sec = 62.93 joules/sec = about 63 watts
—20 percent of 63 watts = 12.6 watts

CharleyBC | November 18, 2019

Interesting. I remember some years ago seeing a study where they did PET scans of brains, and documented significantly higher brain energy consumption during intense intellectual activity, accounting for feelings of exhaustion similar to those from physical activity. Damned if I recall the source now, but it would seem to be at odds with yours.

vmulla | November 18, 2019

We'll have to check if the phantom drain on HW2.5 is going to be less than HW3.0 ;) you know, just extending your 'dimwit' comment.

jebinc | November 18, 2019

-@CharleyBC

Most sources agree the brain consumes ~20% of the body's power. Sources vary on body power consumption, ranging from 60 watts to over 100 watts. Again, this post was intended for light humor.

https://www.scientificamerican.com/article/why-does-the-brain-need-s/

jebinc | November 18, 2019

Rikki-Tikki-Tavi | November 18, 2019

Haha how much does Fish's brain use for precondition? Lol

Effopec | November 18, 2019

I work in the thermal comfort field. There's tons of numbers about how much heat a body puts out. Obviously affected by activity & size. We always just generically use 100W. Nice round number.

jebinc | November 18, 2019

-@Effopec

Do you agree, or not, with the 20% allocation for the brain?

M-A-B-MCMLXXX | November 18, 2019

What if you precondition your brain for optimum learning?

M-A-B-MCMLXXX | November 18, 2019

Damn, WhiteWi wins.

rxlawdude | November 18, 2019

"Haha how much does Fish's brain use for precondition?"

The answer is in an entirely different scale.

TeslaTap.com | November 18, 2019

If you're a cool cat - is your brain consuming less power?

Inquiring minds want to know :)

jimglas | November 18, 2019

it would be interestiing to see brain activiy during different activities.
For example, in sports would there be more cerebellar activity since a lot is muscle memory?

Effopec | November 18, 2019

@jeb - we never tried to break it down to that level, but having spent over 50 years on this earth (and witnessing the current administration and his supporters) makes me think that there is a yuge variation.

jimglas | November 18, 2019

a poorly functioning brain might require more energy since it is less efficient

Rikki-Tikki-Tavi | November 18, 2019

Leave politics out off here. Thanks

jimglas | November 18, 2019

If you want to assert that is political
It says more about you than me

Rikki-Tikki-Tavi | November 18, 2019

"Effopec | November 18, 2019
@jeb - we never tried to break it down to that level, but having spent over 50 years on this earth (and witnessing the current administration and his supporters)"
@jimglas, I am not talking about you.

jimglas | November 18, 2019

never mind .......

CRAIGJFIFTY3 | November 19, 2019

My brain uses approximately twelve watts, however, ten of those watts is used to keep my bald head warm. So, lm either very efficient or very dim.

jebinc | November 19, 2019

-@CRAIGJFIFTY3

Actually, watts used to ”heat the dome” come out of the other 80% of the 63 watt total!

sbeggs | November 19, 2019

@rxlawdude,
The subtlety of your humor is sublime!