[wineeg] all channels alike during recording

  • From: "Jon Frederick, Ph.D." <smiile@xxxxxxxxxx>
  • To: wineeg@xxxxxxxxxxxxx
  • Date: Wed, 16 May 2007 00:08:56 -0600 (Mountain Daylight Time)

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

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