Re: [AUDITORY] Sound proof booth and EEG recording ("Faulkner, Andrew" )

Subject: Re: [AUDITORY] Sound proof booth and EEG recording
From:    "Faulkner, Andrew"  <a.faulkner@xxxxxxxx>
Date:    Thu, 6 Jun 2013 09:50:19 +0000

Dear Massimo We had IAC UK install an adapted double wall booth for EEG a few years back= . They added some additional screening through having no window in the door= and by electrically bonding all the parts with braiding.=20 We also had DC lighting installed and the facility to kill the ac power in = the room. For getting EEG/ABR data out of the room had a tube installed through the w= alls to an adjacent booth to take multicore cables. My understanding is tha= t thus tube acts as a waveguide and minimizes interference. In practice we don't actually use this. Instead we have a Biosemi setup wit= h the amplifier/converter located inside the room. This is battery powered = and connected through the wall by USB cabling to the PC outside. This kit = is working really well for us, for ABR as well as cortical responses. I am happy to get you more details if you are interested Dr Andrew Faulkner Head of Research Department of Speech Hearing and Phonetic Sciences UCL (University College London) Rm 314, Chandler House, 2 Wakefield St London WC1N 1PF tel 44 (0)20 7679 4075 (direct) Internal tel 24075 Fax: +44 (0)20 7679 4238=20 mailto:a.faulkner@xxxxxxxx -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx= ILL.CA] On Behalf Of Massimo Grassi Sent: 05 June 2013 11:13 To: AUDITORY@xxxxxxxx Subject: [AUDITORY] Sound proof booth and EEG recording Dear list members, we are about to buy a IAC soundproof booth and, because here many people do= EEG recordings, we were thinking to have the booth electrically shielded. = The booth will be used to run psychoacoustics, cognitive science and neuros= cience experiments. Here comes the problem. What is the best way to carry the EEG-signal from t= he inside of the booth to the outside of the booth? So far we thought two possible solutions. 1. Place a panel on the booth's wall that has (inside and outside) the spec= ific plug of the signal cable that comes out of EEG amplifier. In practice,= we interrupt the signal cable at the booth's wall. 2. Make a hole on the booth's wall. The hole starts high in the inside of t= he booth, runs downward inside the booth's wall and arrives low at the outs= ide of the booth. I this way the booth is acoustically safe because the hol= e is not direct and the EEG-signal cable is not interrupted, but it needs t= o be very long (wild guess about 6/8 meters). Some of my EEG colleagues are unhappy with both solutions because: 1. You interrupt the signal cable and this interruption could introduce art= efacts in the EEG-signal. 2. The cable is too long and this could introduce artefacts in the EEG-sign= al. Is there anybody out there that had this same problem and that can suggest = me which is the best way to solve it? All the best, m --

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