[FieldTrip] getting started with Neuromag 122 data

Andrew R. Dykstra Andrew.Dykstra at med.uni-heidelberg.de
Tue Feb 28 17:34:59 CET 2012

Hi everyone,

I'm new to Fieldtrip and would like to use it to process data collected on
a Neuromag 122 system.  However, I'm running into some fairly simple issues
with regard to reading header information and events.

Regarding header information, it seems that fieldtrip can read the fif
file's header and raw data, but some fields in the header are not assigned
correctly.  For example, hdr.chantype returns 'unknown' for all channels in
the data set (whereas they should be either 'meg_planar ' or trigger
lines).  Also, hdr.grad returns empty arrays.

Regarding reading events, I read Yang Zhang's solution of
using mne_make_combined_ event_file.m from the MNE stream and manually
creating the event structure (from this list on Jan 8, 2010:
 This will should also work for me, but I was wondering if there is now a
more streamlined way of accomplishing this in Fieldtrip, especially for fif
files either containing or associated with an event list based on a text
file with sample numbers, latencies, and event types.  I did not see an
option in ft_read_event to do this.

Any suggestions would be much appreciated.


Andrew R. Dykstra, PhD
Auditory Cognition Lab
Neurologie und Poliklinik
Universitätsklinikum Heidelberg
Im Neuenheimer Feld 400
69120 Heidelberg

"How small the cosmos.  How paltry and puny compared to human consciousness
. . . to a single individual recollection." - Vladimir Nabokov
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