The below image is of a cardiac artifact (heartbeat) affecting the EEG. You can tells its heartbeat because it happens approximately once per second (the average heartbeat is 72 beats per minute) and it is rhythmic.&nbsp;<br>
<div><img src="@@PLUGINFILE@@/cardiac-artifact.png" alt="Figure 1n: A pulse artifact coming from an ear electrode, which contaminates the ear electrode reference and places the cardiac artifact in every channel." role="presentation" class="img-responsive atto_image_button_text-bottom" width="1784" height="1076"></div>
<p><i>Figure 1r: A pulse artifact coming from an ear electrode, which contaminates the ear electrode reference and places the cardiac artifact in every channel.</i></p>
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<p>Watch the video here for the case example with the cardiac artifact stemming from an ear electrode.</p><p style="text-align: center;"><span style="font-size: 1rem;">&nbsp;</span><span style="font-size: 1rem;">&nbsp;&nbsp;&nbsp;<video controls="true"><source src="@@PLUGINFILE@@/Cardiac%20Artifact.mp4">@@PLUGINFILE@@/Cardiac%20Artifact.mp4</video>&nbsp;</span></p>
<p>Often when a global pulse artifact (like this) contaminates the data, the anatomy of the individual is part to play. Often, folks who are stocky, with short large necks, produce artifacts such as this. One possible way to mitigate this artifact is to
    place cottonballs behind the ears. That said, this preventative measure doesn’t work a majority of the time.</p>
<p>Here is another video of a cardiac artifact, only this time it is showing up in only one electrode location.</p>
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<p style="text-align: center; ">&nbsp;&nbsp;<video width="600" height="400" controls="true" class=""><source src="@@PLUGINFILE@@/pulse%20artifact%202.mp4">@@PLUGINFILE@@/pulse%20artifact%202.mp4</video>&nbsp;&nbsp;<br></p>
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<p><b><i>How do I know that its cardiac artifact and not something else?</i></b></p>
<p>A regular heartbeat occurs at 72 beats per minute. So, a bump in the raw data that arrives once per second, approximately, will give away that the source of the artifact is the rhythmic beating of the heart.</p>