[Eeglablist] EEG amplifier and alternative input

[Grega Repovs]

Hi all,

In one of our studies we have successfully recorded voice using microphone on one of the channels along the EEG signal. The information captured is not sufficient for playback, but it is good enough to be able to compute voice reaction times. If only a few words are used and are distinct enough, they might also be used to classify / identify the response. That fulfilled the needs for our study.

All the best,

Grega Repovs

PS If the aim is to compute reaction times, do take into account that some phonemes have more recognizable 'explosive' onset (eg b, p) while with others amplitude builds up slowly (eg s), which might lead to systematic differences in estimated word response onset. With a large set of trials with mixed starting phonemes, the mean should be fine, however when the same words are used for the same conditions it might lead to a spurious difference between conditions.

On 4 Aug 2010, at 00:51, "Jeff Eriksen" <jefferiksen at comcast.net> wrote:

> Marc,
> 
> EEG recorded for ERPs is generally 0.1 - 100 Hz.
> Human hearing is roughly 20-20,000 Hz.
> Voice recording requires a substantial part of that, but I do not know
> off-hand how high.
> I would say you would probably get a poor voice recording, unless you have
> higher end amplifiers that can sample at 5-10 KHz.
> 
> -Jeff Eriksen
> 
> -----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 5:10 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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