Thanks a lot for all your responses. Some weeks ago I had the following

> Hi to all!
> In our group, we are doing experiments with Transcranial magnetic
> stimulation (TMS) above the cranium to investigate motor control. For
> that purpose, we want to ensure robustness inter-session, intra
> and repeatability at different days.
> I wanted to ask for a good solution for this problem.
> Thank you from advance and best regards.

I have summarized the responses in the following:

-----Original Message-----
From: Ball, Kevin Ph.D. [mailto:kball@nycc.edu]
Sent: Wednesday, May 07, 2003 8:32 PM
To: 'Amir Katz'
Cc: Dishman, J. Donald D.C.; Greiner, Thomas M. Ph.D.
Subject: RE: [BIOMCH-L] Seeking for a good solution for head fixation
during TMS

Hello Amir,

Please take a look at the enclosed paper.
J. Donald Dishman, DC,a Kevin A. Ball, PhD,b and Jeanmarie Burke, PhDb,
Central Motor Excitability Changes After Spinal Manipulation: A
Transcranial Magnetic Stimulation Study, Journal of Manipulative and
Physiological Therapeutics, Volume 25 . Number 1 . January 2002
We use an Optotrak for this purpose. This provides us with real-time
feedback for the purposes of
maintaining precise alignment of the coil.

Hope this helps.

Thanks, Kevin

Kevin Arthur Ball PhD
Director, Biomechanics/Gait Research Laboratory
New York Chiropractic College
2360 State Rte 89
Seneca Falls, NY 13148

kball@nycc.edu kevin.ball@utoronto.ca (alumnus)
315-568-3858 315-568-3204 FAX

Hello Amir

To ensure accurate and reproducible coil placement, we place a flexible,
latex-coated nylon 0.5 x 0.5 cm grid on the scalp and we orientate it
according to anatomic landmarks based on the 10 to 20 International
system of EEG electrode placement. Using this method you may find the
hotspot for certain muscle every time you want stimulate. Federico

Villagra, Federico [FVillagra@som.umaryland.edu]

Hello Amir,

I do not work on TMS, but I have some colleagues here that do. From
my limited understanding of this technique, one of the simplest and
best ways to get people to stay still is to use a bite bar. best

Young-Hui Chang

Dear Amir Katz
Unfortunately we don't have solutions for head fixation but if you are
looking at evaluating the movement you generate, our KineView 2D
movement analyser can do it in a very effective way. If you are looking
at EMG for evaluating muscle contraction and want utmost freedom of
movement, consider KineMyo digital wireless emg. If you want both,
KinePro will do it. For more information, check www.kine.is and don't
hesitate to be in contact. Best regards Baldur

Baldur Thorgilsson, baldur@kine.is
Kine ehf, www.kine.is
Skulagata 26, 101 Reykjavik, Iceland
tel: +354 580 8300, +354 5808302, fax +354 5808309

There are a few options to control for head movement, which you know is
critical to the success of the experiment. I can attach a photo of one
system we use, but it is a bit complicated and it is uncomfortable for
the subject since it is slightly heavy. The best solution has been a
video camera tripod with a clamp. Wrap the handle of the wand with
paper so it does not get damaged. It takes a little while to get used
to this, but it is cost effective and functional. Someone still must be
there to make sure the wand stays in the correct position and to control
for head movement on the part of the subject. So far this has worked
well for me.
We also use a cap we can write on to trace the
shape of the coil on the person's head. I use frosting caps that women
use to dye their hair. They work very well. That way you can locate
the exact spot on the scalp, and record it. with this method, I have
been very consistent in locating the MEP's in my study.

Beekhuizen, Kristina [Beekhuizen@miamiproject.med.miami.edu]

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