very slow wave at frontal sites
Posted: Sat Oct 09, 2004 12:46 am
Hi,
I was wondering if anyone else has experienced problems in their recordings in which there is slow-wave noise (about .25 Hz) primarily at frontal sites. The amplitude of these waves are usually pretty large, ranging anywhere from a few hundred uV upward.
This doesn't happen for us too often, but occasionally it occurs with a few subjects in a row. We've spent a lot of time trying to figure out what it is, and we sometimes have a hunch that it's related to the subject being tired/dizzy/nervous/hot/etc.
The noise doesn't happen when we do recordings in saline, which leads us to believe that it's a subject problem instead of an equipment problem.
Any help on this would be greatly appreciated.
Thanks,
Jeff Johnson
I was wondering if anyone else has experienced problems in their recordings in which there is slow-wave noise (about .25 Hz) primarily at frontal sites. The amplitude of these waves are usually pretty large, ranging anywhere from a few hundred uV upward.
This doesn't happen for us too often, but occasionally it occurs with a few subjects in a row. We've spent a lot of time trying to figure out what it is, and we sometimes have a hunch that it's related to the subject being tired/dizzy/nervous/hot/etc.
The noise doesn't happen when we do recordings in saline, which leads us to believe that it's a subject problem instead of an equipment problem.
Any help on this would be greatly appreciated.
Thanks,
Jeff Johnson