tDCS: We Were Stupid

5 points by tiddchristopher 14 years ago | 7 comments

ricksta 14 years ago |

Why would they put 6mA when you are suppose to send 2mA?

9v/6mA is 1500Ohms. If they added a 3k resistor in series with their setup, they would've up the total resistance to 4500Ohms, resulting in 9v/4500Ohms = 2mA of current.

tiddchristopher 14 years ago | |

To clarify, we measured about 8000 Ohms of resistance through the head, using our electrodes. For some reason, our measurement was off. I'm assuming it's a problem with the electrodes. To fix this issue, we'd need constant monitoring and adjustable resistance. In no way was I planning on running 6mA through my brain.

freshhawk 14 years ago | | |

I guess you're just braver than me but constant monitoring and adjustable resistance are the barest minimum features needed before I'd even consider running current through my brain.

tanvach 14 years ago |

With two components you can build a variable constant current source very quickly: http://users.telenet.be/davshomepage/current-source.htm

teddyknox 14 years ago |

I'm really glad he did that so I didn't have to. The effects sound pretty cool though.

teddyknox 14 years ago | |

This whole thing reminds me of Uncle Rico's time machine in Napoleon Dynamite.

http://www.hulu.com/watch/8729/napoleon-dynamite-2004-the-ti...

derekja 14 years ago |

yikes, be careful!

Hey, I'm curious how you plan to limit current issues through the electrode contact quality. I know when putting on EEG electrodes you can test the impedance, would something like that be needed here?