[FieldTrip] Source Analysis Normalisation in-subject and in-group

[Roey Schurr]

Dear all,

This is a reminder regardig our question about nomralisation of EEG in
source reconstruction analysis.

Thank you all in advance!
Aia and Roey

On Mon, Aug 26, 2013 at 1:08 AM, Roey Schurr <roeysc at gmail.com> wrote:

> Hi all,
>
> We have a question regarding normalisation of EEG signals for source
> reconstruction analysis.
>
> We have EEG records (not ERP) of a few patients in two different
> conditions (each condition consists of several 2 seconds segments/trials).
> Each recording was done over a period of a few days, and in different
> sessions. We also have anatomycal MRI scans for each patient (subject).
>
> We would like to make two statistic comparisons:
>
> 1.    Compare the source analysis of the two conditions in each subject.
>
> 2.    Compare the source analysis of the two conditions, based upon all
> subjects.
>
> For the first comparison, we are puzzled about the appropriate way to
> normalise and standardize our data, since each EEG segment was recorded at
> a different time, and hence may be affected by different electrode
> conductivity, for example. How would you normalise the data?
>
> For the second comparison, of course, we would like to normalise the
> source analysis results in the anatomycal level using ft_volumenormalise.
>
> However, we are puzzled about the appropriate way to normalise and
> standardize our data, since subjects differ from each other (for example,
> anatomycally, resulting in changes of power spectrum).
>
> How would you standartize the data between subjects?
>
>
>
> Thank you very much,
>
> best regards,
>
> Aia and Roey
>
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