function[obj] = logtransform(obj)
%% perform logtransformation of all data

% signals = fieldnames(obj.data.uncorrected);

% for i = 1:length(signals)

eyes = fieldnames(obj.data);
for e = 1:length(eyes)
    eye = eyes{e};
    
    signal = obj.data.(eye).uncorrected.filtered;
    logtransformed_signal = log(signal);
  
    obj.data.(eye).uncorrected.logtransformed = logtransformed_signal;
end