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

Eelke Spaak eelke.spaak at donders.ru.nl
Wed Sep 10 10:49:58 CEST 2014

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 ;)


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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