[wineeg] Re: all channels alike during recording

  • From: "Jon Frederick, Ph.D." <smiile@xxxxxxxxxx>
  • To: wineeg@xxxxxxxxxxxxx
  • Date: Wed, 16 May 2007 10:15:53 -0600 (Mountain Daylight Time)

Yes, the common electrode on the cap was gelled and prepped, and both earclips were connected.

On Wed, 16 May 2007, Alexander Grushvitskiy wrote:

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?

Jon Frederick
QuietMind Foundation
Lafayette Hill, PA

Best regards,

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