<div dir="ltr">Dear James,<div><br></div><div>> how the (unit-less?) SIFT connectivity estimation, specificaly dDTF and rPDC, are converted to Spectral Density or Decibels.<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">I don't think it converts dDTF/rPDC measures into decibels. Probably the decibel conversion is only applied to spectrum density... Can you double check it?</div><div class="gmail_extra"><br></div><div class="gmail_extra">Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 30, 2015 at 11:57 AM, James Jones-Rounds <span dir="ltr"><<a href="mailto:jj324@cornell.edu" target="_blank">jj324@cornell.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello all,<div><br></div><div>Looking thoroughly through the SIFT manual, and related references online, I'm having trouble seeing definitively how the (unit-less?) SIFT connectivity estimation, specificaly dDTF and rPDC, are converted to Spectral Density or Decibels.</div><div><br></div><div>Can anyone give a summary, or point to a reference ( if possible, for non-mathematicians), that describes a little more about how the final output, in the EEG.CAT.Conn fields, results from the coefficients of the MVAR model?</div><div><br></div><div>We typically check yes to convert spectral density to dB, when running SIFT, and I see in the SIFT documentation that the spectral density matrix and transfer function are obtained from the autoregressive model coefficients. But we really want to be sure of what those final (non-unit-less) values represent before we start manipulating them for the purposes of group analysis and publication.</div><div><br></div><div>Thank you anyone who can provide some insight!<span class="HOEnZb"><font color="#888888"><br><br>James<br clear="all"><div><br></div>-- <br><div><div dir="ltr"><div>James Jones-Rounds</div>Laboratory Manager<br>Human Development EEG and Psychophysiology (HEP) Laboratory,<div>Department of Human Development,<br>--------------------------------------------<br>Cornell University | Ithaca, NY<br></div><div><a href="tel:607-255-9883" value="+16072559883" target="_blank">607-255-9883</a></div><div><a href="mailto:eeg@cornell.edu" target="_blank">eeg@cornell.edu</a></div></div></div>
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