<p style="text-align: center;"><span style="font-size: 1rem;">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. For example, if you are questioning activity coming from T3, you must check to see: Does the activity you see emanating from T3 have a surrounding similar wave pattern
at the neighboring elecetrodes of T5, C3, and F7? If the activity is similar, then you have real brain activity. If it is not, then you have fake activity (called "artifact"). Muscle contamination will not share the same phase and field between two or more electrodes. Muscle contamination is one type of artifact in the EEG.</span></p><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.&nbsp;</div><div><br></div><div>Listen to this intro for the EEG video!</div><div><br></div><div><audio controls="true"><source src="@@PLUGINFILE@@/9213022558190946-audio.ogg">@@PLUGINFILE@@/9213022558190946-audio.ogg</audio><br></div>
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<center>&nbsp;<iframe src="https://player.vimeo.com/video/358114442" width="640" height="373" frameborder="0" allow="autoplay; fullscreen" allowfullscreen=""></iframe>&nbsp;<br></center><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 deymed 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>