<div dir="ltr">Dear Rohit,<div><br></div><div>> is it possible to give a frequency band - say Alpha as average of all frequencies from 8-12Hz ?<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Unfortunately I don't think GUI supports it unless you read so in the help.</div><div class="gmail_extra"><br></div><div class="gmail_extra">> But from what Nico said - it seems he wants to plot this information "at a specific time point".</div><div class="gmail_extra"><br></div><div class="gmail_extra">Band-pass filter, Hilbert transform, and use pop_spectopo() function.</div><div class="gmail_extra"><br>> As far as I know, the frequency domain / power spectral density plot as made by spectopo should give this information about a specific time interval of data - say 1 second/ 10 seconds etc. I don't think it can be for a particular time point.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Yes.</div><div class="gmail_extra"><br></div><div class="gmail_extra">> There might be ways to make this time segment shorter, but that would probably be detrimental to the depiction of slower waveforms.<br><br></div><div class="gmail_extra">You can't cheat the time-frequency trade off.</div><div class="gmail_extra"><br></div><div class="gmail_extra">> On the other hand, I wonder whether Wavelet based methods will be more appropriate for shorter time segments ?<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">I would use the abovementioned method using Hilbert transform since it gives you instantaneous amplitude.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 19, 2014 at 12:10 AM, Dr.Rohit Tyagi <span dir="ltr"><<a href="mailto:rohittyagi_2k@rediffmail.com" target="_blank">rohittyagi_2k@rediffmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi Nico and Yamil,<br><br>In addition to Nicolas' question and Yamil's suggestion, I also wanted to know a way to make topographical plots for particular frequency bands. like when using pop_spectopo, instead of giving particular frequency values (like default 6, 11 and 22) is it possible to give a frequency band - say Alpha as average of all frequencies from 8-12Hz ?<br><br>But from what Nico said - it seems he wants to plot this information "at a specific time point".<br>As far as I know, the frequency domain / power spectral density plot as made by spectopo should give this information about a specific time interval of data - say 1 second/ 10 seconds etc. I don't think it can be for a particular time point. There might be ways to make this time segment shorter, but that would probably be detrimental to the depiction of slower waveforms.<br>On the other hand, I wonder whether Wavelet based methods will be more appropriate for shorter time segments ?<br><br>Regards,<br>Rohit<br><br><br><br>From: Yamil Vidal Dos Santos <<a href="mailto:hvidaldossantos@gmail.com" target="_blank">hvidaldossantos@gmail.com</a>><br>Sent: Tue, 09 Dec 2014 11:24:48 <br>To: Nicolas LEBAR <<a href="mailto:nicolas.lebar@etu.univ-amu.fr" target="_blank">nicolas.lebar@etu.univ-amu.fr</a>><br>Cc: eeglablist <<a href="mailto:eeglablist@sccn.ucsd.edu" target="_blank">eeglablist@sccn.ucsd.edu</a>><br>Subject: Re: [Eeglablist] Topographical plots for frequency band<br><div dir="ltr"><div><div><div>Hi Nicolas,<br></div>The simplest would be to band pass filter the data to your freq range of interest and then you can simply use topoplot.m<br></div><div>As you would be using a rather narrow filter, I recommend you to read this article in order to design a filter that won';t mess up your data.<br><a href="http://www.sciencedirect.com/science/article/pii/S0165027014002866" target="_blank">http://www.sciencedirect.com/science/article/pii/S0165027014002866</a><br><br></div>I cannot think of another option, but I';m interested in the opinion of the community.<br></div>Best,<br>Yamil<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 5, 2014 at 5:57 PM, Nicolas LEBAR <span dir="ltr"><<a href="mailto:nicolas.lebar@etu.univ-amu.fr" target="_blank">nicolas.lebar@etu.univ-amu.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi all!<br>
<br>
I';m looking for a way to plot a frequency-band activity (let';s say average alpha 8-12Hz) for 64 electrodes into a topographical map for each subjects (and eventually on a subject average) at a specific time point. The next step is then to have several of these maps for several chronologically different time point. Is there any option to do this, or a direction I can follow to make a script?<br>
<br>
Thanks a lot for anything that helps.<br>
<br>
Nico<br>
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