[wineeg] Re: all channels alike during recording

  • From: Alexander Grushvitskiy <alexandr@xxxxxxxxxxxxx>
  • To: "Jon Frederick, Ph.D." <wineeg@xxxxxxxxxxxxx>
  • Date: Wed, 16 May 2007 13:06:49 +0400

Dear Ph.D.,

Common electrode is already on the cap. And two earclips has to be
connected to A1 and A2.

Best regards,

> After applying a 19-channel Electrocap to a client and starting to record,
> all of the channels appeared identical, and were unresponsive to the usual
> sources of artifact. However, the impedances were different.

> A friend suggested this could be a problem with the ground electrode. 
> Plugging one of the earclip electrodes directly into one of the two ground
> sockets on the Mitsar didn't help-- presumably because the ground from the
> cap continued to have the same problem. However, I don't understand the
> nature of this problem.

> Any ideas about whether this a cap problem? a ground electrode problem?
> or, a software (e.g., end-user-ignorance) problem?

> Thanks!
> Jon Frederick
> QuietMind Foundation
> Lafayette Hill, PA

Best regards,

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