[Eeglablist] Automated way of placing events

[Andrew Hill]

Marco,

You can do this a lot more easily using ERPLAB's "Bin Operator" to add / redefine labels based on conditional logic of event, timing, etc.  Check out erpinfo.org for the plugin.

The workflow is like this
- create a "binlist" (list of events in a text file with labels)
- assign that binlist to a continuous event file
- epoch the continuous file per the bins assigned, and average to ERPs
- then you would run conditional code to re-define your bins and apply it to the ERP file.  

for example:

%add ERPLab event structure
EEG = pop_creabasiceventlist(EEG, '', {'boundary'}, {-99});
% "bindesc.txt" contains numeric and text labels for each event
EEG = pop_binlister( EEG, 'LANT_bindesc.txt', 'no', '', 0, [], [], 0, 0, 0);
%cut continuous file into epoched file - resulting in a single file, unlike the epoching of EEGLAB
EEG = pop_epochbin( EEG , [-1500  1500],  [-0.1  0]);; %3-sec epohcs, baselined 100 ms pre-stim
EEG = eeg_checkset( EEG );
%Create ERPs
ERP = pop_averager( EEG,1,1,1);        
% difference wave subtraction - you can create new ERPs not in the original epochs, here.
ERP = pop_binoperator( ERP, {'bin10 = bin1 - bin3 labels OrientingCost LVF' 'bin11 = bin7 - bin9 labels OrientingCost RVF' });                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
ERP = pop_savemyerp(ERP, 'erpname',  inputfilename, 'filename',  [OUTPUTFILEPATH erpfilename]);
 
Good luck - hope this helps!

Best,
andrew

On May 5, 2012, at 2:33 PM, Marco Montalto wrote:

> Dear List,
> 
> In my experiment I have three conditions and each trial is 30 seconds long. I ignore the first and last 10 seconds of each block and the middle 10-second block I divide into epochs of 2-second duration. Currently I am doing this manually through the EEGLAB GUI by placing an event (with the same 'type' for blocks from the same condition) at every two seconds (in the middle 10-second block) and then extracting epochs around those events. Would anyone know whether there is a more automated and a faster way of doing this? Thanks in advance.
> 
> Regards,
> Marco Montalto
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