[FieldTrip] problems using fieldtrip for source reconstruction EEG

[Julian Keil]

Hi Irene,

it helps if you describe exactly what you want to do (I don’t mean to be rude or patronizing, but check here for suggestions: https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1002202 <https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1002202>).

There are many ways to visualize resting state EEG signals, and you don’t need fieldtrip for all of them.
E.g., if you just want to plot the timecourse of the data, you can use the matlab built-in „plot“ function (e.g. use something like "plot(data.time{1},data.trial{1})“ to plot one trial). If you want to explore your data, ft_databrowser is your friend http://www.fieldtriptoolbox.org/faq/how_can_i_use_the_databrowser/ <http://www.fieldtriptoolbox.org/faq/how_can_i_use_the_databrowser/>

Best,

Julian

________________
Prof. Dr. Julian Keil

Biological Psychology
Olshausenstrasse 62 - R. 306
24118 Kiel, Germany

+49 - 0431 - 880 - 4872
http://www.biopsych.uni-kiel.de/en


> Am 07.01.2019 um 09:57 schrieb Irene Varela Leniz <irene.varela at alumni.mondragon.edu>:
> 
> Good morning Julian, 
> 
> Can you help me with plotting some resting state EEG signals? I am new in Fieldtrip and I dont find clear information about this topic and I dont really know how to do plottings in Fieldtrip. I feel like the fieldtrip documentation is a little bit weak....
> 
> Thank you in advance, 
> Best regards, 
> 
> Irene Varela
> 
> El vie., 4 ene. 2019 a las 14:08, Julian Keil (<julian.keil at gmail.com <mailto:julian.keil at gmail.com>>) escribió:
> Hi Irene,
> 
> what is the reason to use the extra checkdata step?
> The function checks if the input data has the correct „datatype“ field.
> Since you probably don’t have that field, the function will throw an error.
> 
> Also, I’d recommend using the eeglab2fieldtrip-function to get from EEGlab .set to a fieldtrip-like structure.
> 
> Best,
> 
> Julian
> 
> 
>> Am 04.01.2019 um 12:47 schrieb Irene Varela Leniz <irene.varela at alumni.mondragon.edu <mailto:irene.varela at alumni.mondragon.edu>>:
>> 
>> Hi, 
>> 
>> I am a researcher in Mondragon University working on source reconstruction of EEG data. I am new at fieldtrip and I feel a little bit lost about this software. I have some errors in a code I have developed but I do not manage to solve them. Could you please help me?
>> 
>> I want to plot EEG data of a channel called 'A1' which is the first row in a 2D matrix variable called data, which is inside EEG structure. The code I have developed is below and I get the following error: 
>> 
>> Error using ft_checkdata (line 525)
>> This function requires 'timelock' or 'freq' data as input, see ft_datatype_timelock or ft_datatype_freq.
>> 
>> The code is the following:
>> clc; clear all; close all;
>> clear variables
>> restoredefaultpath;  % set a clean path
>> main='E:\';
>> cd='E:\fieldtrip-20181217'; % change this
>> addpath(cd);
>> 
>> ft_defaults;
>> filename = "E:\PBLdata\O200_RS1_final.set"; %cambiar aqui y poner vuestro directorio
>> load(filename, '-mat'); %Create EEG struct
>> location = EEG.chanlocs;
>> data = EEG.data; 
>> 
>> cfg = [];
>> cfg.xlim = [-0.2 1.0];
>> cfg.ylim = [-1e-13 3e-13];
>> cfg.channel = 'A1';
>> datos = data(1,:);
>> Ndata = numel(datos);
>> for i=1:Ndata
>>   % check if the input data is valid for this function
>>   datos(i) = ft_checkdata(datos(i), 'datatype', {'timelock', 'freq'});
>> end
>> 
>> figure; ft_singleplotER(cfg,datos);
>>  
>> Thank you in advance,
>> 
>> Irene
>> 
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>> https://doi.org/10.1371/journal.pcbi.1002202 <https://doi.org/10.1371/journal.pcbi.1002202>
> 
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