[Eeglablist] where to find good EEG amplifiers + AD conversio n

[Hovagim Bakardjian]

Hi,

We have several EEG systems in our lab, among which Biosemi and Neuroscan.
For the frequency range 0.1- 100 Hz, Biosemi has 3 uV pp input noise, while
Neuroscan's (with SynAmps2 amplifiers) has 4 uV pp input noise.
The interpretation as to if this is a significant reduction of noise is up 
the reader.

(It is clear that the merits of an EEG system can be estimated only as a 
combination
of its hardware and software capabilities, as well as of price, support and 
usability, of course.)

Let me know, if you want to know more.
Best Regards,
Hova
------------------------------------------------
Hovagim Bakardjian
Laboratory for Advanced Brain Signal Processing
Brain Science Institute, RIKEN



At 12:49 AM 10/15/2004, you wrote:
>Yes Parhain,
>We have observed an improvement in the signal-to-noise ratio using the
>Biosemi ActiveTwo system. We record brainstem evoked potentials and have
>observed better signal quality with the active electrode. I have not
>crunched the numbers and we have only run a couple of subjects using the new
>system, but the signals are noticeably less noisy than they were with our
>Nicolet system.
>Best,
>CJP
>Christopher J. Poletto, Ph.D.
>Staff Research Biomedical Engineer
>Laryngeal and Speech Section
>Medical Neurology Branch, NINDS
>National Institutes of Health
>Building 10, Room 5D38
>10 Center Drive, MSC 1416
>Bethesda, MD 20892-1416
>
>
>-----Original Message-----
>From: Tom Campbell, Ph.D. [mailto:tom.campbell at helsinki.fi]
>Sent: Thursday, October 14, 2004 10:50 AM
>To: Robert Oostenveld
>Cc: eeglablist at sccn.ucsd.edu; M.J.A.M. van Putten (Clinical Science Systems)
>Subject: Re: [Eeglablist] where to find good EEG amplifiers + AD conversion
>
>
>Hoi,
>
>I would be curious to hear what you think of the BioSemi system:
>http://www.biosemi.com/
>
>The idea of having the amplifier on the electrode seems an interesting
>one. In practice, has anyone found an improvement in signal-to-noise with
>this approach?
>
>--
>Parhain terveisin,
>
>Tom Campbell, Ph.D.
>
>Room 137
>Helsinki Collegium for Advanced Studies
>University of Helsinki, Finland
>P.O.Box 4 (Fabianinkatu 24)
>FIN-00014 University of Helsinki
>Finland
>
>Phone: +358-9 191 23256
>Telefax: +358-9 191 22924
>Mobile: +358-4 154 09764 87
>E-mail: tom.campbell at helsinki.fi
>
>URL: http://tomcampbell.dyndns.org/
>
>
>Quoting Robert Oostenveld <roberto at smi.auc.dk>:
>
> > Hi Michel,
> >
> > A company that sells EEG amplifiers that completely work with Linux
> > (drivers+aquisition+analsyis) is ANT Software, see
> > http://www.ant-software.nl. The amplifier that they include in their
> > Cognitrace system is a TMS Refa amplifier (see http://www.tmsi.com),
> > but I think that TMS as a mainly hardware company does not support
> > linux. I believe the amplifier is pretty good, but I have not done any
> > serious measurements with it myself.
> >
> > best regards,
> > Robert
> >
> > On 12 Oct 2004, at 14:28, M.J.A.M. van Putten (Clinical Science
> > Systems) wrote:
> >
> > > Hi,
> > >
> > > does anyone know a company that sells good EEG amplifiers, including
> > > A/D conversion, at least 8 bipolar inputs plus some aux inputs (for
> > > ECG, oxygen saturation, etc), with drivers for Linux and/or Windows?
> > >
> > > Thanks.
> > >
> > > Michel van Putten
> > > ---------------------------------------------
> > > Michel J.A.M. van Putten MD PhD
> > > Neurologist/clinical neurophysiologist
> > > Haga Ziekenhuis, lokatie Leyenburg
> > > Leyweg 275, 2545 CH The Hague
> > > Netherlands
> > > TEL: +31 (0)70 359 2000
> > > FAX: +31 (0)70 359 2189 m.j.a.m.vanputten at clinicalsciencesystems.com
> > > ----------------------------------------------
> > >
> > ----------------------------------------------------------------------
> > Robert Oostenveld, PhD
> > Center for Sensory-Motor Interaction (SMI)
> > Aalborg University, Denmark