[FieldTrip] source analysis question

[Rob Reinhart]

That's clear now. Thank you so much!

Rob

On Thursday, February 11, 2016, Tzvetan Popov <tzvetan.popov at uni-konstanz.de>
wrote:

>
> Hi Rob,
> your observation is correct. In the particular method applied, i.e.
> spatial filtering, one considers always one node at the time. On the basis
> of the data covariance and the lead field the goal is to compute a set of
> weights that essentially allow for reconstructing the time course of
> activity at a given location independent from all others. The entire
> discretized brain volume is “scanned” eventually resulting in distributed
> source map. The observation you made becomes relevant when you estimate the
> activity at all locations at once, e.g. minimum-norm distributed source
> modeling.
>
> best
> tzvetan
>
> Dear FieldTrip Forum,
>
> I have a naive question. When carrying out this source analysis (
> http://www.fieldtriptoolbox.org/tutorial/networkanalysis), I believe
> there are data from ~275 sensors translated to data occupying ~372 nodes
> (or voxels) in source space. If this is true (i.e., larger number of source
> points derived from smaller number of sensors), does this create a margin
> of error in the source data? And if so, is this error quantifiable?
>
> Any advice on understanding this would be greatly appreciated.
>
> Thank you so much,
>
> Rob Reinhart
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