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Bug 653 - trialfun_trial should be enhanced to also return the trigger code (if possible)
| Status |
CLOSED FIXED |
| Reported |
2011-05-10 23:29:00 +0200 |
| Modified |
2011-06-22 14:18:56 +0200 |
| Product: |
FieldTrip |
| Component: |
core |
| Version: |
unspecified |
| Hardware: |
PC |
| Operating System: |
Mac OS |
| Importance: |
P1 normal |
| Assigned to: |
Jan-Mathijs Schoffelen |
| URL: |
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| Tags: |
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| Depends on: |
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| Blocks: |
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| See also: |
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Robert Oostenveld - 2011-05-10 23:29:26 +0200
in case the event structure contains a trigger event at the sample corresponding to t=0 for each trial, then the trigger value should be returned in the 4th column of trl. Look at
event(i).sample - event(i).offset
in each trial-event for the sample at which the t=0 is defined
Example use
cfg =
dataset: 'Subject01.ds'
trialfun: 'trial'
>> cfg = ft_definetrial(cfg)
evaluating trialfunction 'trialfun_trial'
found 1343 events
created 266 trials
cfg =
dataset: 'Subject01.ds'
trialfun: 'trialfun_trial'
trackconfig: 'cleanup'
checkconfig: 'silent'
checksize: 100000
datafile: 'Subject01.ds/Subject01.meg4'
headerfile: 'Subject01.ds/Subject01.res4'
event: [1343x1 struct]
trl: [266x3 double]
version: [1x1 struct]
In this case it would be nice if cfg.trl would contain the 'backpanel trigger' and the 'STIM' values in the 4th and 5th column. Note that the 'Trial' events which are also present ([perhaps from the marker file) don't have a value.