[FieldTrip] reading offsets from Biosemi bdf file

[Stefan Wiens]

Hi!

I am Stefan Wiens and am working with EEG in Stockholm, Sweden. (
people.su.se/~swiens/)

I use a Cedrus Stimtracker to track visual events with a light diode and a
TTL output to the Biosemi system. The onsets are save nicely in the bdf.

I would also like to check duration by tracking not only onsets but also
offsets.

I tried the following but received a warning.

event = ft_read_event(cfg.dataset, 'detectflank', 'both');

Warning: only up-going flanks are supported for Biosemi

Do I understand correctly that there is not (reasonable) way to extract
offsets?
(I already have a work around by having a different picture at the offset
of the first. This work but a direct approach with onset and offset might
be better.

Thanks for your input!

Stefan
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