[FieldTrip] Polhemus Patriot

smoratti at psi.ucm.es smoratti at psi.ucm.es
Mon Jun 3 18:07:40 CEST 2013

Dear Julian,

Maybe a stupid answer and probably you have taken care of this already, but does the chair have any metal? We use an IKEA wooden garden chair.



Stephan Moratti, PhD

see also: http://web.me.com/smoratti/

Universidad Complutense de Madrid
Facultad de Psicología
Departamento de Psicología Básica I
Campus de Somosaguas
28223 Pozuelo de Alarcón (Madrid)


Center for Biomedical Technology
Laboratory for Cognitive and Computational Neuroscience
Parque Científico y Tecnológico de la Universidad Politecnica de Madrid
Campus Montegancedo
28223 Pozuelo de Alarcón (Madrid)

email: smoratti at psi.ucm.es
Tel.:    +34 679219982

El 03/06/2013, a las 17:14, Julian Keil escribió:

> Dear FieldTrip-Users,
> I have a not really FieldTrip-related question, but maybe one of you can help me anyways.
> In our lab, we have a Polhemus Patriot 3D tracking system to acquire electrode positions.
> Unfortunately, the recordings are severely distorted in the Z-axis (up-down).
> After contacting the Polhemus Support, I got the information, that this is due to metal in the surroundings of the source which distorts the magnetic field.
> I tried to get as far away from any metal as possible in our lab (~1.5 m to the walls and floor) but to no avail.
> Now to my question: Has anyone any experience dealing with this? I'm quite puzzled by this as I know plenty of labs use Polhemus trackers, and I'm not sure if our lab is especially metal prone or if I'm missing something.
> Thanks a lot for any help.
> Julian
> ********************
> Dr. Julian Keil
> AG Multisensorische Integration
> Psychiatrische Universitätsklinik
> der Charité im St. Hedwig-Krankenhaus
> Große Hamburger Straße 5-11, Raum E 307
> 10115 Berlin
> Telefon: +49-30-2311-1879
> Fax:        +49-30-2311-2209 
> http://psy-ccm.charite.de/forschung/bildgebung/ag_multisensorische_integration
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