<div dir="ltr">Dear Jean Michel<div>As far as I know you can do it on an averaged data structure (item 1) or do the same with the data structure before averaging (3). I did not understand what you meant by 2. </div><div><br>
</div><div>Yuval<br><br><div class="gmail_quote">On 21 March 2011 22:58, Jean-Michel Badier <span dir="ltr"><<a href="mailto:jean-michel.badier@univmed.fr">jean-michel.badier@univmed.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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Dear fieldtrip users,<br>
<br>
There are different ways of estimating the covariance for LCMV
calculation.<br>
If I am correct: <br>
<br>
1. As suggested in one of the tutorial one can apply the calculation
of the covariance directly on the average data (for the different
periods of interest that are at least a base line and the period of
interest).<br>
<br>
2. Estimate the covariance from the average of the covariance rather
than the covariance of the average using cfg.keeptrials = "yes"<br>
<br>
3. Estimate the covariance from the whole trials concatenated
together. <br>
Is there an easy way to do that in fieldtrip (beside create a new
data set of one trial constituted of all the trials)?<br>
<br>
Thanks<br>
<br>
Jean-Michel<br>
<br>
<div>
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<a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr">Y.Harpaz<br>
<br>a link to the BIU MEG lab:<br><a href="http://faculty.biu.ac.il/~goldsa/index.html" target="_blank">http://faculty.biu.ac.il/~goldsa/index.html</a><div><div><br></div><div> " Why, Dan," ask the people in Artificial Intelligence, "do you waste your time conferring with those neuroscientists? They wave their hands about information processing and worry about where it happens, and which neurotransmitters are involved, and all those boring facts, but they haven't a clue about the computational requirements of higher cognitive functions." "Why," ask the neuroscientists, "do you waste your time on the fantasies of Artificial Intelligence? They just invent whatever machinery they want, and say unpardonably ignorant things about the brain." The cognitive psychologists, meanwhile, are accused of concocting models with neither biological plausibility nor proven computational powers; the anthropologists wouldn't know a model if they saw one, and the philosophers, as we all know, just take in each other's laundry, warning about confusions they themselves have created, in an arena bereft of both data and empirically testable theories. With so many idiots working on the problem, no wonder consciousness is still a mystery.<i> Philosopher Daniel Dennet, consciousness explained, pp. 225</i></div>
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