FieldTrip

Definetrial and preprocessing require the original MEG dataset, which is available from ftp://ftp.fcdonders.nl/pub/fieldtrip/tutorial/Subject01.zip.

% find the interesting segments of data
cfg = [];                                                  % empty configuration
cfg.dataset                 = 'Subject01.ds';              % name of CTF dataset  
cfg.trialdef.eventtype      = 'backpanel trigger';
cfg.trialdef.prestim        = 1;
cfg.trialdef.poststim       = 2;
cfg.trialdef.eventvalue     = 9;                     
cfg = definetrial(cfg);            

% preprocess the data
trl = cfg.trl
trl([2,3,4,30,39,40,41,45,46,47,51,53,59,77,85],:) = [];           
 % remove the segments that have artifacts
cfg.channel    = {'MEG', '-MLP31', '-MLO12'};        % read all MEG channels except MLP31 and MLO12
cfg.lpfilter   = 'yes';                              % apply lowpass filter
cfg.lpfreq     = 35;   
dataFC2timelock    = preprocessing(cfg);                      

These data have been cleaned from artifacts by removing several trials and two sensors; see visual_artifact_rejection. For event related averaging data it is recommended to lowpass de data at 35 Hz (and NOT to detrend!).

Subsequently you can save the data to disk.

save dataFC2timelock dataFC2timelock