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Author Topic: Does thinking take energy?  (Read 9207 times)

Offline realmswalker

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Does thinking take energy?
« on: 17/05/2006 02:09:58 »
Does thinking take energy?
Your always tired after hard thinking, but does it use energy?
could this explain why stephen hawkings is so skinny!?


 

Offline ukmicky

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Re: Does thinking take energy?
« Reply #1 on: 17/05/2006 04:09:47 »
ONLY IF YOUVE GOT A BRAIN :)


Michael
 

Offline neilep

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Re: Does thinking take energy?
« Reply #2 on: 17/05/2006 12:33:12 »
Hmmm...thinking definitely uses energy and it also exercises the brain too.....so why am I tired all the time ?

I would have thought that the incurable disease of myotrophic lateral sclerosis (motor neurone ) probably goes a long way to contribute to Hawkings svelte appearance !!:D

Men are the same as women, just inside out !
« Last Edit: 17/05/2006 14:19:38 by neilep »
 

ROBERT

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Re: Does thinking take energy?
« Reply #3 on: 17/05/2006 13:11:32 »
" The total energy consumption of the brain is about 25 watts . Inasmuch as a significant fraction of this energy will not be used for useful computation, we can reasonably round this to 10 watts."
http://www.merkle.com/brainLimits.html

If the above is true we are all as bright as a 10 Watt bulb :)
[The lightbulb in your fridge/microwave oven is about ten watts].
 

« Last Edit: 17/05/2006 14:42:33 by ROBERT »
 

Offline MayoFlyFarmer

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Re: Does thinking take energy?
« Reply #4 on: 18/05/2006 19:01:41 »
any physiological process takes some amount of energy.  when you are thinking, the neurons in your brain are firing.  energy is needed to replace that which is used in this process, however, the ampount of energy required for thsi is no where near the amount for processes like locamotion.

Are YOUR mice nude? ;)
 

Offline cynar

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Re: Does thinking take energy?
« Reply #5 on: 23/05/2006 03:08:01 »
In fact, no. At least, there's next to no change in energy consumption. The tiredness you feel is down too the muscles. When you think hard, the fight or flight reponses kick in. The body then spends hours in a tense state, expecting something too happen. This burns a lot of energy and leads to fatigue. (It also explains the time dependent degridation in handwriting under exam conditions!).
 

Offline MayoFlyFarmer

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Re: Does thinking take energy?
« Reply #6 on: 23/05/2006 17:20:44 »
while you ARE probably correct that the lapse in handwriting is due to muscle fatiuge (I think we can all attest to that), thinking DOES use energy!  ATP hydrolisis is required to maintain Na and K gradients needed to generate action potentials in all neurons.  Since thinking is depenedent upong these action potentials, thinking requires ATP hydrolisi (aka metabolic energy consumption)

Are YOUR mice nude? ;)
 

Offline qazibasit

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Re: Does thinking take energy?
« Reply #7 on: 09/06/2006 10:23:03 »
yes most of ur body's glucose consumtion is by brain.
 

another_someone

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Re: Does thinking take energy?
« Reply #8 on: 09/06/2006 15:21:16 »
quote:
Originally posted by qazibasit
yes most of ur body's glucose consumtion is by brain.



While this is undoubtedly true, glucose is only one of the energy mechanisms available for the body, and as I understand it, the brain is only capable of utilising a very few of them, the predominant one being glucose.  If one looks at overall energy usage, rather than simply a narrow perspective of limiting oneself to glucose, how would that compare overall energy usage in various parts of the body?



George
 

Offline Titanscape

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Re: Does thinking take energy?
« Reply #9 on: 15/06/2006 08:07:32 »
I think that as we sleep we use up as much energy in the brain as when studying...

And I think tiredness comes from the brains clock which requires sleep by time not after tiresome effort.

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Re: Does thinking take energy?
« Reply #9 on: 15/06/2006 08:07:32 »

 

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