Why does Cyton have two pin lines? How do they work?
Hi,
I'm new with the Cyton board, and I'm trying to learn how to capture E.E.G. signals. The question that arises is that the board manages to capture 8 channels, but there are two lines of pins, the upper pins and the lower pins.
I followed the "Getting Started" example of the documentation and connected all the electrodes in the lower pin line.
My question is, are the top pins the same as the pins at the bottom?, Does it have to do with each of the signals you can pick up? (E.E.G., E.C.G., E.M.G.), And if not, what difference does it have or what functions does each line have?
Also, if you could lead me on a path to better understand the 10-20 system.
My project intention is to be able to detect human emotions.
Thank you very much for taking the time to read me and help me.
Comments
Galgo, hi. All EEG / EMG / ECG amplifiers have TWO inputs per channel: plus and minus. Typically with EEG, one polarity is ganged together as a common reference bus. On the Cyton this is the default and the plus pins are connected together and available on the SRB2 pin (closest to the board.) The minus pins then are placed on the scalp. And the SRB2 connected to an ear lobe.
In some cases such as EMG, the SRB2 bus can be turned off per channel. Then the individual plus and minus pins are placed along the muscle body (for example one pin at the muscle end and the other at the center of the muscle.)
Regards, William