<div dir="ltr">Hi Eddy,<div>The question about what difference if any exists between the interpretation of power and power density is near and dear to my heart as well, and is currently under discussion here on the list:</div>
<div><br></div><div><a href="http://sccn.ucsd.edu/pipermail/eeglablist/2014/008224.html">http://sccn.ucsd.edu/pipermail/eeglablist/2014/008224.html</a></div><div><br></div><div>To extract numerical values from Spectopo, look at the variables it creates - I believe one is "spectra" which contains the power density values, and the other is "freqs" which contains the corresponding frequency markers so you know what bin lines up with what frequency.</div>
<div><br></div><div>Brian</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jun 23, 2014 at 3:53 PM, <span dir="ltr"><<a href="mailto:eeglablist-request@sccn.ucsd.edu" target="_blank">eeglablist-request@sccn.ucsd.edu</a>></span> wrote:<br>
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<br>Today's Topics:<br>
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1. Numerical power values (Eric Ger)<br>
<br><br>---------- Forwarded message ----------<br>From: Eric Ger <<a href="mailto:greyjoyx@gmail.com">greyjoyx@gmail.com</a>><br>To: <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a><br>Cc: <br>
Date: Mon, 23 Jun 2014 14:30:50 -0400<br>Subject: [Eeglablist] Numerical power values<br><div dir="ltr"><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px">
Hi,<br></div><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px">
<br></div><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px">I've been trying to find a method (within EEGLab) through which I can extract numerical values for power (in dB or mV^2) in an epoched (and ICA cleaned) .set file and I am unable to do so. spectopo () plots the power density (log of mV^2/Hz) with frequency (Hz) which might also be useful, but I am unable to extract numerical values from that plot as well. Is there a function that allows for specification of baseband (e.g. Alpha ~8-10 Hz) and outputs the power values within that baseband for each channel (similar to how BESA performs this operation)? Can 'spectopo' output such values? What sort of calculation/transformation is performed to obtain such values with 'spectopo' (if at all)?<br>
</div><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px"><br></div><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px">
Thanks,<br></div><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px"><br></div><div style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:16px;margin-top:0px;margin-bottom:0px">
Eddy</div></div>
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