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<p>Sweat artifact arises when the sodium and water in sweat interacts with the salt-impregnated past of the EEG cap. What you see are high amplitude slow waves, that look like giant delta waves, sometimes slower than 1Hz.</p>
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<p style="text-align:center"><iframe src="https://player.vimeo.com/video/360592193" width="640" height="373" frameborder="0" allow="autoplay; fullscreen" allowfullscreen=""></iframe></p>
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<p>Some analysis programs filter out frequencies less than 1Hz or less than 2Hz, causing the sweat artifact to disappear in the filtered image. It is important to catch sweat artifact when it is happening and try to cool down your client and the room to
    avoid a poor recording.</p>
<p>In the following video, we can see how checking the filters can prevent slow artifacts, such as sweat, from being noticed by the electroencephalographer. We are removing the low pass filter to see how the data looks with and without automatic filtering.</p>
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<p style="text-align:center"><iframe src="https://player.vimeo.com/video/360592232" width="640" height="377" frameborder="0" allow="autoplay; fullscreen" allowfullscreen=""></iframe>
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