[FieldTrip] Appending data from two sessions for ICA

Giorgio Arcara giorgio.arcara at gmail.com
Wed Feb 11 10:46:57 CET 2015

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

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

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

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?



*Giorgio Arcara*
Post-doc research fellow

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

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