ft_definetrial

[Fahimeh Mamashli]

Hi again,
sorry I found out myself!
I discovered the problem. maybe it is interesting for others:
sometimes it seems routine ft_definetrial can not find all the events based on its default definition.
this is the routine way in ft_definetrail:

cfg34                         = [];
cfg34.dataset                 = '../rawdir/cp02a/cp02a4.fif';
cfg34.trialdef.eventtype      = 'STI101';
cfg34.trialdef.eventvalue     = 34; 
cfg34.trialdef.prestim        = 0.1;
cfg34.trialdef.poststim       = 0.6;

cfg34 = ft_definetrial(cfg34);

but I the problem is that, It could not detect all the events. so I did as follows to find all the event values:

hdr = ft_read_header('../rawdir/cp02a/cp02a1.fif');
[event] = ft_read_event('../rawdir/cp02a/cp02a1.fif','header',hdr,'detectflank','down');

cfg34                         = [];
cfg34.dataset                 = '../rawdir/cp02a/cp02a4.fif';

cfg34.event=event;

cfg34.trialdef.eventtype      = 'STI101';
cfg34.trialdef.eventvalue     = 34; 
cfg34.trialdef.prestim        = 0.1;
cfg34.trialdef.poststim       = 0.6;

cfg34 = ft_definetrial(cfg34);

the point is to change 'detectflank','down'! the default is 'up' and in my data it could not detect events.

because in default events I just had one event value '34'!! but after changing detectflank, it found 35!!

Best wishes,
Fahimeh 

------------------------
PhD student
Max Planck Institute for Human Cognitive and Brain Sciences
Stephanstraße 1A 
04103 Leipzig
Germany

Tel: +49 341 9940 - 2570

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