Hi SPMers,

I am doing eyeblink correction on an EEG dataset that was imported from EEGLAB using the following script

S = [];

S.D = D;

S.mode = 'mark';

S.badchanthresh = 0.2;

S.methods.channels = {'FPZ'};

S.methods.fun = 'eyeblink';

S.methods.settings.threshold = 4;

S.methods.settings.excwin = 0;

S.append = true;

S.prefix = 'a';

D = spm_eeg_artefact(S);

preblinkfile = D.fname;

S = [];

S.D = D;

S.timewin = [-500 500];

S.trialdef(1).conditionlabel = 'Eyeblink';

S.trialdef(1).eventtype = 'artefact_eyeblink';

S.trialdef(1).eventvalue = 'FPZ';

S.trialdef(1).trlshift = 0;

S.bc = 0;

S.prefix = 'eyeblink';

S.eventpadding = 0;

D = spm_eeg_epochs(S);

blinkfile = D.fname;

S = [];

S.D = D;

S.mode = 'svd';

S.ncomp = 1;

S.timewin = [-Inf Inf];

D = spm_eeg_spatial_confounds(S);

S = [];

S.D = [Reapp_dir,'\',preblinkfile];

S.mode = 'spmeeg';

S.conffile = [Reapp_dir,'\',blinkfile];

D = spm_eeg_spatial_confounds(S);

S = [];

S.D = D;

S.mode = 'ssp';

S.prefix = 'T';

D = spm_eeg_correct_sensor_data(S);

However, I get the following error

Error using scalingfactor (line 168)

cannot convert V to unknown

Error in scalingfactor (line 87)

factor = cellfun(@scalingfactor, old(:), new(:));

Error in ft_apply_montage (line 294)

scale = scalingfactor(input.chanunit, montage.chanunitorg);

Error in spm_eeg_montage (line 361)

sens = ft_apply_montage(sens, sensmontage, 'keepunused', keepunused);

Error in spm_eeg_correct_sensor_data (line 144)

Dnew = spm_eeg_montage(S1);

Error in NARC_PostEeglabConv_Reapp_Proc (line 350)

D = spm_eeg_correct_sensor_data(S);

I am not sure why the 'newunit' variable from scalingfactor.m gets the value 'unknown'.

Any help with this will be very much appreciated.

Thanks,

-Muhammad