[FieldTrip] Problem redefining trials with different event as zero point

KatrinH Heimann katrinheimann at gmail.com
Fri Sep 19 16:50:58 CEST 2014

Dear Fieldtrippers,

I would like to redefine my trials using another event as zero point. So I
defined trials on a certain event and preprocessed them. All trials also
contain another event. Now I want to redefine them using this other event
as zero point and cutting 1 sec before and 1 sec after.
I tried simply using the definetrial function again:

cfg = []

cfg.dataset= strcat(sb,'mov_ica_cleaned.mat')

cfg.trialdef.eventtype  = 'trigger';

cfg.trialdef.eventvalue = 'resp'

cfg.trialdef.prestim    = -1

cfg.trialdef.poststim   = 1

mov_data_small = ft_definetrial(cfg)

But then I get the error message

Error using ft_read_header (line 1833)
unsupported header format (matlab)

Error in ft_trialfun_general (line 71)
hdr = ft_read_header(cfg.headerfile, 'headerformat', cfg.headerformat);

Error in ft_definetrial (line 169)
    [trl, event] = feval(cfg.trialfun, cfg);

Somebody able to help me?

Thanks and best

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