<p>Source localization is difficult with EEG, the more channels one has in the measurement, the more accurate the source localization is. One software tool that has allowed for greater source localization in EEG is LORETA.</p><p></p><h2><a name="_Toc35418102">LORETA</a></h2><p>LORETA stands for Low Resolution Electromagnetic Tomographical Analysis and was developed and published on by Roberto Pascual-Marquis et al. in 1994. LORETA was a way to locate electric activity in the brain based upon multi-channel EEG recordings. LORETA assumed the that, among the infinite set of possibilities of source localization for EEG, the neighboring neurons were simultaneously synchronized with the source defined. The computational task that LORETA undertakes is finding the smoothest of all possible 3D tomographical distributions (a common procedure in generalized signal processing). Tomography is the term used, as it is accurate in the sense that it is used in PET, MRI, and CT scans.</p><h4><b>&nbsp;Here are a few videos showing a few ways LORETA is used in EEG Analysis</b></h4><h4>Here is a video of LORETA as used in EEGLab in MatLab by Arnaud DeLorme</h4><h2>&nbsp;<div><div><div tabindex="-1" title="LORETA in EEGLab" preload="auto" id="id_videojs_624a205ed713c_2" data-setup-lazy="{&quot;techOrder&quot;: [&quot;youtube&quot;], &quot;sources&quot;: [{&quot;type&quot;: &quot;video/youtube&quot;, &quot;src&quot;:&quot;https://www.youtube.com/watch?v=amttvN_Sb6A&quot;}], &quot;language&quot;: &quot;en&quot;, &quot;fluid&quot;: true}" lang="en" role="region" aria-label="Video Player"><div><iframe id="id_videojs_624a205ed713c_2_Youtube_api" frameborder="0" allowfullscreen="1" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" title="YouTube video player" width="640" height="360" src="https://www.youtube.com/embed/amttvN_Sb6A?controls=0&amp;modestbranding=1&amp;rel=0&amp;showinfo=0&amp;loop=0&amp;fs=0&amp;hl=en&amp;enablejsapi=1&amp;origin=https%3A%2F%2Fschoolofneurotherapy.com&amp;widgetid=1"></iframe><div></div></div><div tabindex="-1" aria-disabled="false"></div><div aria-live="off" aria-atomic="true"></div><button type="button" aria-live="polite" title="Play Video" aria-disabled="false"><span aria-hidden="true"></span>Play Video</button></div></div></div>&nbsp;<br><a name="_Toc35418103"></a></h2><p></p><h4>Here is a video of LORETA and ICA as used in WinEEG by Juri Kropotov</h4><p></p><p></p><div><div><div tabindex="-1" title="Juri Kropotov and LORETA in WinEEG" preload="auto" id="id_videojs_624a205ed71d4_3" data-setup-lazy="{&quot;techOrder&quot;: [&quot;youtube&quot;], &quot;sources&quot;: [{&quot;type&quot;: &quot;video/youtube&quot;, &quot;src&quot;:&quot;https://www.youtube.com/watch?v=CrrA771v-WY&quot;}], &quot;language&quot;: &quot;en&quot;, &quot;fluid&quot;: true}" lang="en" role="region" aria-label="Video Player"><div><iframe id="id_videojs_624a205ed71d4_3_Youtube_api" frameborder="0" allowfullscreen="1" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" title="YouTube video player" width="640" height="360" src="https://www.youtube.com/embed/CrrA771v-WY?controls=0&amp;modestbranding=1&amp;rel=0&amp;showinfo=0&amp;loop=0&amp;fs=0&amp;hl=en&amp;enablejsapi=1&amp;origin=https%3A%2F%2Fschoolofneurotherapy.com&amp;widgetid=2"></iframe><div></div></div><div tabindex="-1" aria-disabled="false"></div><div aria-live="off" aria-atomic="true"></div><button type="button" aria-live="polite" title="Play Video" aria-disabled="false"><span aria-hidden="true"></span>Play Video</button></div></div></div><br><p></p><p></p><h4>Here is a video of LORETA as used in Neuroguide by Bob Thatcher</h4><p></p><div><div><div tabindex="-1" title="Bob Thatcher on LORETA in Neuroguide" preload="auto" id="id_videojs_624a205ed7245_4" data-setup-lazy="{&quot;techOrder&quot;: [&quot;youtube&quot;], &quot;sources&quot;: [{&quot;type&quot;: &quot;video/youtube&quot;, &quot;src&quot;:&quot;https://www.youtube.com/watch?v=VzQoLg-FKBQ&quot;}], &quot;language&quot;: &quot;en&quot;, &quot;fluid&quot;: true}" lang="en" role="region" aria-label="Video Player"><div><iframe id="id_videojs_624a205ed7245_4_Youtube_api" frameborder="0" allowfullscreen="1" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" title="YouTube video player" width="640" height="360" src="https://www.youtube.com/embed/VzQoLg-FKBQ?controls=0&amp;modestbranding=1&amp;rel=0&amp;showinfo=0&amp;loop=0&amp;fs=0&amp;hl=en&amp;enablejsapi=1&amp;origin=https%3A%2F%2Fschoolofneurotherapy.com&amp;widgetid=3"></iframe><br>

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