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By attaching it behind the subject on the MEG armchair I did not have any noise (as it does not move). Best, Stephan ________________________________________________________ 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) Spain and 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) Spain email: [log in to unmask] Tel.: +34 679219982 El 17/02/2012, a las 09:48, LABYT Etienne 226379 escribió: > Dear Virginie, > Yes, indeed, this problem with Etymotic system is known and it is recommended to maintain with tape the transducers on the small table in forn of the subject or better,, on the back of the MEG armchair (there are scratch to do this). > Bye > Etienne > > Etienne Labyt, PhD > Responsable Imagerie > Responsable plateforme MEG/EEG > > CEA-Leti, CLINATEC > MINATEC Campus, 17 rue des Martyrs > 38054 GRENOBLE Cedex 9 > [log in to unmask] > Tél. : + 33 (0)4 38 78 06 87 – Fax et/ou mobile : + 33 (0)4 38 78 53 55 > www.leti.fr > > <image001.jpg> <image002.jpg> > > De : Discussion list for international MEG community [mailto:[log in to unmask]] De la part de Antoine Ducorps > Envoyé : jeudi 16 février 2012 15:57 > À : [log in to unmask] > Objet : Re: [megcommunity] etymotic earphones and magnetometers > > Dear Virginie, > > We also experienced this problem with our Elekta Triux, this was already the case with our previous CTF system. > As a solution, we keep the transducers as far as possible from the sensors, and for that longer audio tubes help (we had 1 meter tubes with CTF). > Then the remaining artefact should be well removed by SSS, as clearly originating from outside the sensor sphere. > Hoping this comment helps, > > Very best regards, > Antoine. > --------------------------------------------------------------- > Antoine Ducorps > CENIR - Centre de Magnétoencéphalographie > Tél (33) 1 42 16 11 62 (bureau) > (33) 1 42 16 14 10 (MEG) > http://www.cenir.org/ > http://cogimage.dsi.cnrs.fr/ > --------------------------------------------------------------- > Adresse postale: > CRICM - UMR 7225 / UMR-S 975 > CENIR Plate-forme MEG-EEG > Hôpital de la Pitié Salpêtrière > 47, Bd de L'Hôpital > 75651 Paris Cedex 13 - France > --------------------------------------------------------------- > > Le 16 févr. 2012 à 15:31, VAN WASSENHOVE Virginie a écrit : > > > Dear all, > > we noticed that some magnetometers could be sensitive to sounds sent through the Etymotic system - empty room/remotely from the system. > This appears to be directly due to the transducer parts. > > Has any of you experienced such (very problematic) issue? Has attempts to better isolate this system been helpful? > > Thanks in advance for any suggestion. > > Cheers, > Virginie > > > Virginie van Wassenhove . CEA.DSV.I2BM.NeuroSpin - INSERM Cognitive NeuroImaging Unit > Bât 145 Point Courrier 156 . Gif sur Yvette F-91191 . France > Ph: + 33 (0)1.69.08.1667 . [log in to unmask] . [log in to unmask] > http://sites.google.com/site/virginievanwassenhove > https://sites.google.com/site/ceaunicogmeg >