<div dir="ltr">Hi all, <div><br></div><div>Regarding your question, I think power spectral density is normalized and is expressed in units per Hz. But, power spectra are not normalized. </div><div><br></div><div>Ayda</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 3, 2014 at 3:28 PM, Makoto Miyakoshi <span dir="ltr"><<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.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">Dear Brian,<div><br></div><div>Actualy I did not know the difference. According to wikipedia, spectral density is something like spectra represented as cumulative distribution function.</div>
<div><br></div><div>
<a href="http://en.wikipedia.org/wiki/Spectral_density" target="_blank">http://en.wikipedia.org/wiki/Spectral_density</a><br></div><div><br></div><div>I don't know though when it is more appropriate to use power spectra and spectral density... someone in the list please help us.</div>
<div><br></div><div>Makoto</div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div class="h5">On Wed, May 28, 2014 at 8:50 AM, Erickson <span dir="ltr"><<a href="mailto:ericksonb.eng@gmail.com" target="_blank">ericksonb.eng@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">List,<div>The function "spectopo" produces output in units of 10log_10 (uV^2/Hz). This is power spectral density, as opposed to a power spectrum. Could anyone comment on the implications of interpreting, physiologically, the PS vs. the PSD of a neural signal? Thank you,</div>
<div><br></div><div>- Brian</div><div>Applied Brain and Cognitive Sciences Program</div><div>Drexel University</div></div>
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-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div>
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