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Hi Giulia,
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<div>You can of course constrain the sourcemodel to the vertex normals. In other words, if you have a subject-specific cortical sheet, you can compute the vertex normals (ideally on a high resolution image), and project the per dipole leadfield onto that orientation.
The steps would be:</div>
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<div>- compute cortical sheet based sourcemodel</div>
<div>- coregister the source model to the sensor array</div>
<div>- compute the vertex normals</div>
<div>- compute the leadfields of the individual dipoles</div>
<div>- project the leadfields along the vertex normals.</div>
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<div>As such, there is no specific function in FieldTrip that does this for you out-of-the-box, so that would require a bit of coding of your own.</div>
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<div>For the visualisation of dipoles with their orientation, we have the ft_plot_dipole function, but I am not sure whether this is what you are looking for.</div>
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<div>Best wishes,</div>
<div>Jan-Mathijs</div>
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<blockquote type="cite" class="">
<div class="">On 11 Dec 2023, at 10:40, Giulia Ricci via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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<div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">Hello Fieldtrip Community,</span></div>
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</span></div>
<div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; margin: 0px; background-color: rgb(255, 255, 255);">
<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">I am currently working on extracting time series belonging to brain ROIs, and I am
specifically interested in defining source orientations in the cortex.</span></div>
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</span></div>
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<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">At the moment, I'm using the<span class="Apple-converted-space"> </span><i class="">svd</i> function
to obtain, for each source, the orientation that explains the maximum variance of the dipole's signals. However, in addition to this method, I would like to explore the results obtained by constraining each source, orienting it perpendicularly to the cortex.</span></div>
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<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class=""><br class="">
</span></div>
<div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; margin: 0px; background-color: rgb(255, 255, 255);" class="">
<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">I am reaching out to ask whether FieldTrip provides a function for modeling dipole
orientation perpendicularly to the cortex surface or if there are any suggestions within the community for achieving this goal. </span></div>
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</span></div>
<div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; margin: 0px; background-color: rgb(255, 255, 255);" class="">
<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">Additionally, I am curious if there is a FieldTrip function for plotting or checking
the resulting dipoles' orientation.</span></div>
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<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class=""><br class="">
</span></div>
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<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">Thank you in advance.</span></div>
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<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class=""><br class="">
</span></div>
<div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; margin: 0px; background-color: rgb(255, 255, 255);">
<span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; font-weight: 400;" class="">Giulia</span></div>
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