<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Exchange Server">
<!-- converted from text --><style><!-- .EmailQuote { margin-left: 1pt; padding-left: 4pt; border-left: #800000 2px solid; } --></style>
</head>
<body>
<meta content="text/html; charset=UTF-8">
<style type="text/css" style="">
<!--
p
{margin-top:0;
margin-bottom:0}
-->
</style>
<div dir="ltr">
<div id="x_divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif">
<p>Hi John,</p>
<p><br>
</p>
<p>Thank you for your feedback. I'm not sure, however, I understand your suggestion. Is the idea to exclude the white matter from the head model? If so, aren't we discarding an important part of the volume conductor model? Furthermore, if I'm correctly interpreting
the FAQ page I provided, it should be possible to apply a tissue mask after we've completed the 3 steps you listed since ft_sourceanalysis and ft_prepare_leadfield are both called after we have the grid, head volume, and sensor locations.</p>
<p><br>
</p>
<p>Thanks,</p>
<p><br>
</p>
<p>Alexander</p>
</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> RICHARDS, JOHN <RICHARDS@mailbox.sc.edu><br>
<b>Sent:</b> Friday, August 5, 2016 9:51:34 AM<br>
<b>To:</b> fieldtrip@science.ru.nl; Nakhnikian, Alexander<br>
<b>Subject:</b> constrain source solution space</font>
<div> </div>
</div>
</div>
<font size="2"><span style="font-size:10pt;">
<div class="PlainText"><a href="https://static-content.springer.com/esm/art%3A10.1007%2Fs10548-016-0505-3/MediaObjects/10548_2016_505_MOESM3_ESM.docx">https://static-content.springer.com/esm/art%3A10.1007%2Fs10548-016-0505-3/MediaObjects/10548_2016_505_MOESM3_ESM.docx</a><br>
<br>
1--prepare a grid, for the source volume<br>
2-prepare a head volume<br>
3-prepare electrode (or meg) scalp locations<br>
<br>
These three elements are used for a lead field. <br>
<br>
LF and other elements are used w EEG in ft_sourceanalysis. <br>
<br>
There are several tutorials on FT site to do this. <br>
<br>
John<br>
-----Original Message-----<br>
From: fieldtrip-bounces@science.ru.nl [<a href="mailto:fieldtrip-bounces@science.ru.nl">mailto:fieldtrip-bounces@science.ru.nl</a>] On Behalf Of fieldtrip-request@science.ru.nl<br>
Sent: Friday, August 5, 2016 6:00 AM<br>
To: fieldtrip@science.ru.nl<br>
Subject: fieldtrip Digest, Vol 69, Issue 4<br>
<br>
Send fieldtrip mailing list submissions to<br>
fieldtrip@science.ru.nl<br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br>
or, via email, send a message with subject or body 'help' to<br>
fieldtrip-request@science.ru.nl<br>
<br>
You can reach the person managing the list at<br>
fieldtrip-owner@science.ru.nl<br>
<br>
When replying, please edit your Subject line so it is more specific than "Re: Contents of fieldtrip digest..."<br>
<br>
<br>
Today's Topics:<br>
<br>
1. Constrain Source solution space (Nakhnikian, Alexander)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Thu, 4 Aug 2016 18:25:38 +0000<br>
From: "Nakhnikian, Alexander" <Alexander_Nakhnikian@hms.harvard.edu><br>
To: "fieldtrip@science.ru.nl" <fieldtrip@science.ru.nl><br>
Subject: [FieldTrip] Constrain Source solution space<br>
Message-ID:<br>
<SN1PR07MB1568036B161E8337E72F69F8B7070@SN1PR07MB1568.namprd07.prod.outlook.com><br>
<br>
Content-Type: text/plain; charset="iso-8859-1"<br>
<br>
Hello All,<br>
<br>
<br>
I'm trying to constrain my source space to gray matter and I found suggestions for how to do this on the FAQ:
<a href="http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter">
http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter</a><br>
<br>
[<a href="http://www.fieldtriptoolbox.org/_media/logo-share.png]<http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter">http://www.fieldtriptoolbox.org/_media/logo-share.png]<http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter</a>><br>
<br>
faq:can_i_restrict_the_source_reconstruction_to_the_grey ...<<a href="http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter">http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter</a>><br>
<a href="http://www.fieldtriptoolbox.org">www.fieldtriptoolbox.org</a><br>
Yes, there are two strategies you can use. You can either make a regular 3D grid spanning the whole brain in which only grid locations in grey matter are considered ...<br>
<br>
<br>
<br>
<br>
The problem is that I cannot figure out how to actually do this. For example, I don't see options in ft_sourceanalysis for inputing segmented mir with the tissue types of interest, now for giving the program an anatomic mask. Any feedback would be greatly appreciated.<br>
<br>
<br>
Best,<br>
<br>
<br>
Alexander<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20160804/48cc4c8e/attachment-0001.html">http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20160804/48cc4c8e/attachment-0001.html</a>><br>
<br>
------------------------------<br>
<br>
_______________________________________________<br>
fieldtrip mailing list<br>
fieldtrip@donders.ru.nl<br>
<a href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br>
<br>
End of fieldtrip Digest, Vol 69, Issue 4<br>
****************************************<br>
</div>
</span></font>
</body>
</html>