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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear Eeglabbers,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>May I have a few questions on interpolation methods implemented in eeglab.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>We have used topoplot to interpolate certain statistical parameters we gather from EEG electrodes. Is interpolation in topoplot done along the scalp surface or on some other surface – or volume?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The question becomes even more important when we would like to calculate the gradient of the parameter in question. Is there a function in eeglab that would calculate gradients along the scalp surface?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>We would also like to calculate phase gradients. Is that implemented? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This of course all hinges on the question of how to calculate distances between electrodes. I’m not entirely sure but my feeling is that one should go along the scalp surface.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’d be grateful for your insights.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Kind regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Peter<o:p></o:p></p><p class=MsoNormal>----8<-----------------------------------------------------<o:p></o:p></p><p class=MsoNormal>Péter Buzás, PhD<o:p></o:p></p><p class=MsoNormal>Associate Professor<o:p></o:p></p><p class=MsoNormal>Institute of Physiology<o:p></o:p></p><p class=MsoNormal>Medical School, University of Pécs<o:p></o:p></p><p class=MsoNormal>Szigeti út 12, Pécs 7624, Hungary<o:p></o:p></p><p class=MsoNormal>email: <a href="mailto:peter.buzas@aok.pte.hu"><span style='color:#0563C1'>peter.buzas@aok.pte.hu</span></a><o:p></o:p></p><p class=MsoNormal>Tel.: +36-72-501500 ext. 31749<o:p></o:p></p><p class=MsoNormal>Fax: +36-72-536244<o:p></o:p></p><p class=MsoNormal>***********************************************************<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>