[FieldTrip] Appending data from two sessions for ICA

[Giorgio Arcara]

Dear Fieldtrip users,

I recorded some MEG data in two separate recordings. The recordings were
one immediately after the other, with a short pause (of few seconds) in the
middle. In my recording I stored the head position continuously
(CTF-system).

My aim is to combine the data from the two recordings to run a single ICA,
with the aim of identifying artifacts.

After the preprocessing and after using ft_appenddata I receive I warning
because there is an inconsistency in sensor positions stored in the data
structure.

The appending works but I lose all sensor information. (to draw some
figures I solved retrieving the sensor information from some previous data
objects).

I'm just using this data for an ERF analysis, but I'd like to perform also
source analysis later.


My questions are: how to deal with this issue? Do you think it is
reasonable (as I think) to perform an ICA on the overall data even if from
different files? Could this issue affect a following source analysis?




Thanks!


-- 

*Giorgio Arcara*
Post-doc research fellow

Department of Neuroscience, University of Padua
Via Giustiniani, 2
35128, Padua, Italy

https://sites.google.com/site/giorgioarcara/
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