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Hello all,</div>
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My name is Matthew Wood and I'm a graduate student at The University of Texas at San Antonio. I'm starting to use cluster analysis for my EEG experiments and wanted to make sure I understood a few things about how neighborhoods in FieldTrip.</div>
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1) Our lab uses a 26 EEG electrode setup in a geodesic array (link to diagram: <a href="https://www.researchgate.net/figure/Diagram-representing-the-26-electrode-placement-in-geodesic-array_fig2_235354855" id="LPlnk">https://www.researchgate.net/figure/Diagram-representing-the-26-electrode-placement-in-geodesic-array_fig2_235354855</a>).
I noticed there do not exist any templates on Fieldtrip for my specific array, so I used the feature to use an image to build a layout file. If anyone happens to have a layout file I can use with more accurate measurements, I would appreciate if you could
share it so that I can use that instead.</div>
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2) Since I'm building the layout and neighborhoods from scratch, I'm a little nervous about their validity. I used the "enableedit" configuration in the ft_neighbourplot function to build my neighbors (I've attached a figure here). One of the features of a
geodesic array is that all electrodes are equally spaced apart. Is it correct to then assume that this should be reflected in the neighborhood structure? </div>
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3) Finally, for cluster analysis, does the distance between the neighbors matter? If so, does the fact that my layout has my electrodes placed with (seemingly) arbitrary units matter?</div>
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I appreciate any help anyone can provide!</div>
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Matthew</div>
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<a target="_blank" id="LPImageAnchor633043" href="https://www.researchgate.net/figure/Diagram-representing-the-26-electrode-placement-in-geodesic-array_fig2_235354855"><img id="LPThumbnailImageId633043" alt="" height="236" style="display: block;" width="240" src="https://www.researchgate.net/profile/Nicole_Wicha/publication/235354855/figure/download/fig2/AS:767255897993216@1559939469184/Diagram-representing-the-26-electrode-placement-in-geodesic-array.jpg"></a></div>
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<a target="_blank" id="LPUrlAnchor633043" href="https://www.researchgate.net/figure/Diagram-representing-the-26-electrode-placement-in-geodesic-array_fig2_235354855" style="text-decoration: none; color: var(--themePrimary);">Figure 2. Diagram representing the
26-electrode placement in geodesic...</a></div>
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Download scientific diagram | Diagram representing the 26-electrode placement in geodesic array. from publication: Meaning first: A case for language-independent access to word meaning in the bilingual brain | This study aimed to determine how deeply a word
is processed in the bilingual brain before the word's language membership plays a role in lexical selection. In two ERP experiments, balanced Spanish-English bilinguals read lists of words and pseudowords in Spanish and English,... | Bilingual, Lexical Access
and Spanish | ResearchGate, the professional network for scientists.</div>
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