<br>
<p>Environmental noise should always strike the electroencephalograher as strange, due to its fast, rhythmic appearance. When an electrical system is not grounded, when there is poor connectivity between devices, when there is “electro-smog” in the environment,
    as we sometimes see in large cities, these are all situations where environmental noise such as this appears. Its best to check a building for environmental noise before moving in, as sometimes the solution is difficult to arrive at.</p><p style="text-align: center;"><span style="font-size: 1rem;">&nbsp;&nbsp;&nbsp;&nbsp;<video controls="true"><source src="@@PLUGINFILE@@/Environmental%20Noise.mp4?time=1597383179926">@@PLUGINFILE@@/Environmental%20Noise.mp4?time=1597383179926</video>&nbsp;</span></p>This next EEG is one where the electrical noise is not easy to spot with the naked eye, that is, not until we remove the low pass filter, allowing all frequency activity to enter the recording. Once we remove the filter, we can see that there is environmental noise that contaminates the entire EEG, making it a bad recording--not impossible to interpret, but certainly dirty.<br><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@@/Electricity.mp4?time=1597383222174">@@PLUGINFILE@@/Electricity.mp4?time=1597383222174</video>&nbsp;</span></p>&nbsp;<br>