[Eeglablist] EEG amplifier and alternative input

[B. Motoc]

Hi Marc,

It would be unusual to be able to successfully record voice over an EEG
channel (hardware and associated software). The main issue is that EEG is a
low frequency event (usually 0+ to 200 Hz) while voice is a high frequency
process (1000 to 10,000 Hz). Reducing a channel's bandwidth to under 1000 Hz
would totally compromise the capacity to transfer voice based information.
If you want to save response values (did the subject say yes or no or maybe
....) then you could find a way to encode these outcomes and shift them into
EEG frequencies and, this way, keep them with the rest.

Let me know more,
Bogdan

-----Original Message-----
From: eeglablist-bounces at sccn.ucsd.edu
[mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Marc
Sent: Tuesday, August 03, 2010 6:10 AM
To: eeglablist at sccn.ucsd.edu
Subject: [Eeglablist] EEG amplifier and alternative input

Hi.

This is not directly related to EEGLab. But I thought someone may be
able to give some pointers.

We're doing some experiments measuring scalp EEG of participants. One
of the variables we intend to record is the participant's voice reply.
We're wondering if it is possible to use the same EEG hardware
amplifier to record the voice reply? Have anyone tried that before?
That is, instead of connecting the electrodes to the one of the 64
channels of the amplifier, we connect a microphone to the input
channel. I assume we will be able to record as good a signal as any
audio amplifier? Is there any thing else to watch out for?

Thanks for any advise.

Marc.
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