neighbourdist for megplanar

[Guillaume Rousselet]

Hey Julian,

the function FT_NEIGHBOURSELECTION will output a structure of sensor
neighbours. The best is to fine tune the threshold distance by
checking the output <neighbours> against your sensor map.

Best,

Guillaume



On 14 Jul 2010, at 08:45, Julian Keil wrote:

> Hi everyone,
>
> I was wondering what is a sensible neighbour distance for computing
> the megplanar from 4D148 data.
> The default is set to "4", but this this leads to on average 149
> neighbours per channel, which does not look right to me.
> Changing the distance to 0.1 reduces the number of neighbours to
> 5.5, yet I'm still unsure if this is the best/correct way.
>
> Thanks a lot
>
> Julian
>
>
>
> Dipl. Psych. Julian Keil
>
> OBOB-Lab
> University of Konstanz
> Department of Psychology
> P.O. Box D25
> 78457 Konstanz
> Germany
>
> Tel: ++49 - (0)7531 - 88 42 50
> Fax: ++49 - (0)7531 - 88 28 91
> Email: julian.keil at uni-konstanz.de
> Homepage: http://www.uni-konstanz.de/obob
>
>
>
>
>
>
>
> ----------------------------------
>
> The aim of this list is to facilitate the discussion between users
> of the FieldTrip toolbox, to share experiences and to discuss new
> ideas for MEG and EEG analysis.
>
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>
> http://www.ru.nl/fcdonders/fieldtrip/
>


************************************************************************************
Guillaume A. Rousselet, Ph.D., lecturer

School of Psychology
Institute of Neuroscience & Psychology
Centre for Cognitive Neuroimaging (CCNi)

The University of Glasgow, charity number SC004401

http://www.psy.gla.ac.uk/staff/index.php?id=GAR01

Email: g.rousselet at psy.gla.ac.uk
Fax. +44 (0)141 330 4606
Tel. +44 (0)141 330 6652
Cell +44 (0)791 779 7833


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----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.
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