[FieldTrip] Assigning Channels - Error channel layout

[Taylor, Danielle]

Hello Fieldtrippers,

My name is Danielle Taylor, and I have been developing a script that reads in data which have been preprocessed using EEGlab, in order to run a frequency analysis.

I've been successful at compiling an ERP thus far in FieldTrip. However, when I attempted to run a frequency analysis on a particular channel (Oz), it turned out that I could not select this channel, as channels had never been assigned when loading my EEGlab file.

Therefore, I am reformatting my Fieldtrip preprocessing script, but have run into an error. I can't seem to find any record of others running into this error in the discussion either, so I'm not quite sure how to move forward. My guess is that because the file is no longer a bdf (biosemi file), but instead a .set (from eeglab), that there might be problems assigning channels, but that is purely a guess.

The error I get is:
Error using load
Unknown text on line number 1 of ASCII file C:\Users\danie\fieldtrip\template\layout\biosemi32.lay
"Fp1".

Here is the script I have so far:

path_ft = 'C:/Users/danie/fieldtrip';
path_data = 'C:/Users/danie/OneDrive - Oklahoma A and M System/LEAP/ALE/EEG/SSVEP/';

addpath(path_ft);
ft_defaults;

subjects = {'001' '002' '003' '004' '005' '006' '007' '008' '009' '010'...
            '012' '013' '014' '015' '016' '017' '018' '021' '022' '023'...
            '025' '026' '027' '029' '031' '032' '033' '035' '036' '037'...
            '038' '040' '041' '043' '044' '045' '047' '049' '050' '051'...
            '052' '053' '054' '055' '056' '057' '058' '059' '060' '061'...
            '062' '063' '064' '065' '066' '067' '068' '069' '070' '071'...
            '072' '073' '074' '075' '076'};

 load (fullfile(path_ft,'template','layout','biosemi32.lay'));
 biosemi32_layout = ft_prepare_layout(cfg);

for i=1:length(subjects)

    ftype = 'eeglab_set';
    datapath = strcat(path_data, subjects{i});
    dataset = fullfile(datapath, strcat(subjects{i},'.set'));

    cfg           = [];
    cfg.dataset = dataset;
    cfg.headerfile = dataset;
    cfg.dataformat = ftype;
    cfg.headerformat = ftype;

    cfg           = [];
    cfg.dataset = dataset;
    cfg.trialfun  = 'ft_trialfun_general';
    cfg.trialdef.eventtype = 'trigger';
    cfg.trialdef.eventvalue = 'B3(5)';
    cfg.trialdef.prestim    = .2;
    cfg.trialdef.poststim   = 3;
    cfg = ft_definetrial(cfg);
    trl           = cfg.trl;

    cfg.dataset = dataset;
    cfg.channel = biosemi32_layout;
    cfg.outputfile = fullfile(datapath,  'dataPNU');
    ft_preprocessing(cfg);
end

Any assistance would be greatly appreciated!
Thank you all,

Danielle Taylor, M.S.
Doctoral Candidate,
Clinical Psychology
Oklahoma State University

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https://doi.org/10.1371/journal.pcbi.1002202