Coonecting electrodes on the head

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fleur
Posts: 17
Joined: Mon Nov 23, 2009 12:32 pm

Coonecting electrodes on the head

Post by fleur »

Hello,
I read documentation on where to put electrodes on the head if we want to have electrical signals (catch by the ModularEEG).
If we put one electrode on the Cz area, one on the forehead (ground electrode) and one on the nose (reference electrode), we can detect foot mouvement.
But where exactly, should we put the electrode on the head to have the Cz area? Is it in the middle of the head? For the forehead, is it also in the middle of the forehead?

For detecting hand movement? Where exactly should we put electrodes? (C3 et C4 areas)
Is the areas different from people?

If there are interference with wifi, should we have problem to detect signals?

Thank you for your help,

nbaron
Posts: 23
Joined: Mon Jan 18, 2010 4:54 am

Re: Coonecting electrodes on the head

Post by nbaron »

fleur wrote: But where exactly, should we put the electrode on the head to have the Cz area? Is it in the middle of the head? For the forehead, is it also in the middle of the forehead?
For detecting hand movement? Where exactly should we put electrodes? (C3 et C4 areas)
Is the areas different from people?
Image
On the picture you have the relative positions of electrodes.
fleur wrote: If there are interference with wifi, should we have problem to detect signals?
You have no interference with Wifi or ohter radio frequency because the used frenquencies are above 1 Mhz and EEG
signals are under 200 Hz. There can be interference with electrical signals (50Hz or 60Hz) but in all *good* EEG acquisition system there is filter for those bands. ModEEG as a *good* EEG acq system performs a filter for that.

yrenard
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Re: Coonecting electrodes on the head

Post by yrenard »

Thank you nbaron for replying !!
nbaron wrote: You have no interference with Wifi or ohter radio frequency because the used frenquencies are above 1 Mhz and EEG
signals are under 200 Hz. There can be interference with electrical signals (50Hz or 60Hz) but in all *good* EEG acquisition system there is filter for those bands. ModEEG as a *good* EEG acq system performs a filter for that.
You can filter the signals inside OpenViBE as well.

Yann

fleur
Posts: 17
Joined: Mon Nov 23, 2009 12:32 pm

Re: Coonecting electrodes on the head

Post by fleur »

Thank you for your help

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