[FieldTrip] data.sampleinfo when preprocessing was completed in EEGLAB

[Clara A. Scholl]

Dear Eelke,

Thank you!  Just to clarify:  when I use ft_mvaranalysis to perform
multivariate autoregressive modeling on time series data over multiple
trials, the relative temporal adjacency of each trial (assumed to be
consecutive segments, when this is not the case) has no impact on the
resulting autoregressive coefficients and the covariance of the residuals?

Respectfully,
Clara

On Wed, Sep 10, 2014 at 4:49 AM, Eelke Spaak <eelke.spaak at donders.ru.nl>
wrote:

> Dear Clara,
>
> 1) Some FT functions require a sampleinfo for their inner workings, so
> they reconstruct it in a simple way if it is not present. You can
> safely ignore this warning if you are not doing anything with sample
> indices yourself. Specifically, the FT artifact and event functions
> use sample indices (i.e. return segments of artifacts/events in terms
> of samples relative to the original recording), if you are not using
> these you are probably safe.
>
> 2) Not me ;)
>
> Best,
> Eelke
>
> On 9 September 2014 21:25, Clara A. Scholl <cas243 at georgetown.edu> wrote:
> > Dear FieldTrip Community,
> >
> > I did preprocessing in EEGLAB and imported into FieldTrip using
> > eeglab2fieldtrip (from EEGLAB version 13.3.2b).  The resulting FieldTrip
> > data structures do not have the data field "sampleinfo" to specify the
> > position of each trial relative to the actual recording.  As a result of
> > this, I get the warning "reconstructing sampleinfo by assuming that the
> > trials are consecutive segments of a continuous recording" when calling
> the
> > functions ft_timelockanalysis and ft_mvaranalysis.
> >
> > My questions are twofold:
> >
> > 1) when can I ignore this warning?
> > 2) has anyone imported the sampleinfo into FieldTrip from an EEGLAB EEG
> > structure? Any guidance on the best way to do this?
> >
> > Thanks immensely for feedback!
> > Respectfully,
> > Clara
> >
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