A 9V Battery To Your Brain Can Improve Your Gaming

autospa writes with an intriguing story found at Nature about direct electrical stimulation's effect on the brain. By applying low levels of electrical current to different parts of the brain via electrodes placed on the scalp, University of New Mexico researchers claim to have documented some significant changes in brain activity, which vary depending on the part of the brain targeted. Gamers, take note: in one experiment in which volunteers were recorded while playing a video war game, "those receiving 2 milliamps to the scalp (about one-five-hundredth the amount drawn by a 100-watt light bulb) showed twice as much improvement in the game after a short amount of training as those receiving one-twentieth the amount of current." The idea of affecting the brain by electric stimulation isn't new; but the battery-powered, non-invasive variety naturally leads some people to consider rolling their own.

Comments

Not just for gaming

[Tet]

Sod computer gaming. My first through when reading this was "can I fit it inside my race helmet and improve my performance in real life?"

Re:Not just for gaming

[thePowerOfGrayskull]

Apparently there is no risk of seizure, because the current does not trigger neuron activity (page 2):

Very little is known about how TDCS works. Scientists theorize that the mild current primes the neurons for action but does not trigger the voltage spikes that neurons use to communicate. "Presumably, it is polarizing neurons and making them more or less likely to respond to inputs," says Warren Grill, a neural engineer at Duke University, in Durham, NC. "But what's happening at the level of the synapse, where the business of learning really takes place, we don't know."

Of course, given the opening sentence to that paragraph, it's probably not something you'd want to play with at home...

2ma doubles your score?

[John Hasler]

An alligator clip on each ear and plug into the wall! Score x1000!

Wear gloves, though. You don't want any of the juice to leak into your computer.

Re:one-five-hundredth (0.2%), one-twentieth (5%)

[Anonymous Coward]

They're called fractions. Believe it or not, other countries have them too.

Battery-shortage due to Koreans

[Anonymous Coward]

Maybe they'll reach 400 Actions Per Minute with this.

Obligatory Ringworld reference

[CODiNE]

http://wireheading.com/wirehead.html

Re:It's all fun

[comm3c]

until it begins to wear down your brain and you get Alzheimer's at 30

Good point. I don't think we understand enough about the electrical operation of the brain to be jumping for this. If I had to make a comparison, we can turn up the clock rate on an oscillator, but it doesn't mean that the device relying on the clock can handle it without some strange, sudden and premature failure.

Compatibility?

[Jeremi]

Can I plug the battery in to my tin foil hat directly, or will I need some sort of adapter?

Re:Compatibility?

[ColdWetDog]

Can I plug the battery in to my tin foil hat directly, or will I need some sort of adapter?

This would seem to be a classic call for duct tape.

Hackers!

[Memroid]

I wonder when the 9V bug/feature will be added for the Valve Anti-Cheat System..

Re:It's all fun

[derGoldstein]

Another analogy is passing current through frog legs. You can see the effect, and deduce that there's a correlation between the current and the resulting motion, but it doesn't mean you know why or what the underlying mechanism is.

If anything, this seems quite hazardous. Our bodies are designed (ahem -- naturally selected) to defend themselves from much of what's found in nature, which probably doesn't include running even very small amounts of current through our brains. The fact that the brain is encased in a solid shell in mammals should give an idea of how vulnerable it really is. This experiment bypasses that defense and introduces stimuli that you almost certainly won't find in nature. We already know that introducing a tiny amount of arsenic into the bloodstream will kill most (almost all) living things, so we're weary of chemical experimentation, but we haven't been messing around with the brain long enough to know what the effects of electrical stimulation will be.

It could induce brain cancer for all we know. I personally wouldn't go volunteering for this type of experimentation.

Re:Isn't that just electroshock therapy?

[Dan93]

It's not banned. Just regulated.

Put that in your FSB and smoke it

[billcopc]

DUH! It's common knowledge that bumping up vCore allows for higher clocks :)

Re:one-five-hundredth (0.2%), one-twentieth (5%)

[rubycodez]

Nope, but the U.S. bias was in assuming the 100W bulb was connected to 110-120VAC mains, instead of the planet's more common 220-240VAC mains

Re:Ughh

[anethema]

I took electrical engineering so I may have a touch of knowledge upon the subject.

A 9V battery is <40V and no one mentioned actually piercing the skin or actually removing your skin (what?) so I really don't think a 9V battery is a danger here.

Also, how are you going to ensure all the current from 2 electrodes placed ANYWHERE on the outside of the body go through your heart?

Anyways, if we were talking about higher voltages I might agree, but anyone touching themselves with a 9V battery ANYWHERE is probably a safe thing to do. Hell putting one on your tongue does not even generate enough current to make the muscle go into any kind of serious contraction, and that is about as close and low resistance as you can get.

Again, if you don't step the voltage up, or start driving nails into your skull/chest cavity and hook batteries up to them, i posit that 9V batteries can generally be considered safe, even to the uninformed.

Re:Ughh

[subreality]

A quick lesson in electrical safety:

Current is what will kill you, not voltage. Greater current causes greater voltage gradients inside of you, which will disrupt neurons more and increase power dissipation, burning things. Higher voltage is more dangerous because it increases current. Decreasing resistance also increases the current. Your skin is a pretty good insulator, but if you poke wires in deep enough that they reach the wet bits that protection is lost and the current will spike way up.

Here are some measurements on myself:
2.5M ohm Probes pinched in my fingers of left and right hands
500K ohm After licking fingertips
1M ohm Across my scalp
50K ohm Across my tongue

A 9V battery isn't going to come anywhere near 2mA with any of those contacts. For anyone who wants to try wiring up their brain, though, I suggest putting a 4.7K resistor in series with the 9V battery - the added resistance is insignificant next to your skin, but when you accidentally stab the electrodes straight through your skull and into your brain it'll limit the current to safe levels.

I also suggest that a 9V battery is worthless because of the resistance of your skin. If you want this to actually work you should use a much higher voltage (such as stepping that 9V up with an oscillator driving a transformer) and a much larger value of protection resistor (Ohm's Law), to better approximate a constant-current source. A constant-current power supply is even better. Note that above 300V you're running a risk of dielectric breakdown in your skin - IE, the resistance suddenly drops - and the current will surge. You'd better have a protection resistor that can save you from the highest possible open circuit voltage of whatever power supply you use.

Start low and work your way up. 1mA is enough to put you in v-fib if it's direct to the heart. Of course, anything applied to the skin will spread out considerably before it reaches your heart - it's more like 50mA to the skin directly across the chest to induce v-fib - but it's best to have a healthy respect for what you're doing.