Real EEG data will have what we call “field” and “phase.” What that means is that any activity we see in the raw EEG data—if it is real brainwave activity—will have a surround. What you see emanating from T3 will have a surrounding similar wave pattern
at T5, C3, and F7. Muscle contamination will not share the same phase and field between two or more electrodes. <br><br>
<div>Often it is necessary to validate data at O1 and O2, as the occipitalis muscle is sometimes the culprit of high amplitude beta activity and sometimes O1 and O2 beta activity is real brainwave activity. The video we see here shows two different ways to
    ascertain data’s reality. By first removing the low pass filter, we see the data become “hashy,” but when examining it for field and phase (in WINEEG), we see that O1 and O2 share the same waveform patterns. <br></div>
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<p style="text-align:center"><iframe src="https://player.vimeo.com/video/358114442" width="640" height="373" frameborder="0" allow="autoplay; fullscreen" allowfullscreen=""></iframe>
  <br></p><br>Another way to check for field and phase in your data is to switch to a montage that places channels in a sequential order, so that the channels are next to their proximal neighbors. In neuroguide, for example,
the deymen montage places channels next to their neighboring electrode sites:<br><br>
<div style="text-align: center;"><img src="@@PLUGINFILE@@/electrode-pair.png?time=1564134176374" alt="" role="presentation" class="img-responsive atto_image_button_text-bottom" width="760" height="703"><br></div><br>
<div style="text-align: center;"><i>Figure 1e: A deymed montage in Neuroguide software will place electrodes sequentially, which will allow the reader to check for field and phase in the EEG between neighboring electrode pairs.</i> <br></div>