title: Plotting EEG signal after loading it, the signals does not look very well
body: <p>I am new with EEG signal, I got the dataset from BCI Competition IV Dataset 1, and I want to load it and plot it. Here is the code, and I attached the plot, Please can someone help me why is that?</p>
  <pre><code>dat = loadmat('BCICIV_calib_ds1d.mat', struct_as_record=True)
  ch_names =  ['AF3', 'AF4', 'F5', 'F3', 'F1', 'Fz', 'F2', 'F4', 'F6', 'FC5', 'FC3', 'FC1', 'FCz', 'FC2', 'FC4', 'FC6', 'CFC7', 'CFC5', 'CFC3', 'CFC1', 'CFC2', 'CFC4', 'CFC6', 'CFC8', 'T7', 'C5', 'C3', 'C1', 'Cz', 'C2', 'C4', 'C6', 'T8', 'CCP7', 'CCP5', 'CCP3', 'CCP1', 'CCP2', 'CCP4', 'CCP6', 'CCP8', 'CP5', 'CP3', 'CP1', 'CPz', 'CP2', 'CP4', 'CP6', 'P5', 'P3', 'P1', 'Pz', 'P2', 'P4', 'P6', 'PO1', 'PO2', 'O1', 'O2']
  info = mne.create_info(ch_names = ch_names, ch_types = ['eeg']*59, sfreq= 100 ) 
  EEGdata   = dat['cnt'].T
  
  raw = mne.io.RawArray(EEGdata, info)
  </code></pre>
  <p>Can someone tell me why when I want to plot it, it looks like this?</p>
  <p><a href="https://i.stack.imgur.com/q7TiU.jpg" rel="nofollow noreferrer">The plot should not be like this</a></p>