[FieldTrip] Gradiometer definition after ft_appenddata
"Jens Klinzing, Universität Tübingen"
jens.klinzing at uni-tuebingen.de
Thu Feb 6 14:22:50 CET 2014
I have a question concerning ft_appenddata dropping the gradiometer
definition to make sure one is not using a grad definition that does not
fit the data (see  for an earlier quick discussion).
I have an MEG data set in which some subjects had a short break during
recording. The fiducial markers remained in place during the break. For
each of these subjects, I would like to define trials in both data parts
and then append them before doing further analysis. Is it valid to use
the first part's grad definition for the combined data set?
The grad definitions in the two parts are not identical. I assume this
is because the subjects moved during the break and the grad definition
is in relation to the fiducial markers at recording onset?
Thanks in advance for your help!
All the best,
P.S.: Sorry in case there is information on that on the fieldtrip
website. I could only find an earlier quick exchange on this mailinglist:
Here, Eelke Spaak said one can attach gradiometer data as long as one is
sure it's the correct one. But how do I know it is correct?
...and the general info about the grad definitions:
More information about the fieldtrip