<div dir="ltr"><div>Thanks Dear Makoto and Dear Pal,<br></div>I think I couldn't to say my question clearly. I mean firstly whether number of samples in one window (or segment) will affect performance of FFT or WT of EEG signals?<br>
Secondly is there any standard for number of sample in one window for applying FFT or WT ? <br><div>Thanks in advance.<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, May 22, 2014 at 11:31 AM, 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">I mean if you have more <i>trials </i>(in the case of ERP) for FFT, that is beneficial. If you have the same number of trials but longer analysis window it's not beneficial, as Pal pointed out.<div>
<br></div>
<div>Makoto</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-05-21 23:32 GMT-07:00 Pål Gunnar Larsson <span dir="ltr"><<a href="mailto:pall@ous-hf.no" target="_blank">pall@ous-hf.no</a>></span>:<div>
<div class="h5"><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="NO-BOK">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Remember that EEG is a very dynamic signal. Hence, longer samples is not expected to give better information as the signal changes within the sample window.
However, increasing the sampling rate, increases the information. According to Nyquist you will be able to reconstruct a signal if you sample faster than the double of the highest frequency in the signal. However, that is when the signal is stable (EEG is
not) and the sample is infinite long. Practically you will often end up sampling 5-10 time the highest frequency in biological signals.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Pål G. Larsson M.D., PhD.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Head of Clinical Neurophysiology<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Department of Neurosurgery<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Division of Surgery and Clinical Neuroscience<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Oslo University Hospital<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Po.box 4950 Nydalen<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">0424 Oslo<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Norway<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Tel: <a href="tel:%28%2B47%29%2023074407" value="+4723074407" target="_blank">(+47) 23074407</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">Mobile: <a href="tel:%28%2B47%29%2093429791" value="+4793429791" target="_blank">(+47) 93429791</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">E-mail:
<a href="mailto:pall@ous-hf.no" target="_blank">pall@ous-hf.no</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1f497d">not sensitive<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dr. philos. Pål G. Larsson<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Seksjonsleder Klinisk nevrofysiologi<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Nevrokirurgisk avdeling<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Oslo Universitetssykehus<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Postboks 4950 Nydalen<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">0424 Oslo
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Tlf.: 23074407<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Mobil: 93429791<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">E-mail:
<a href="mailto:pal.gunnar.larsson@ous-hf.no" target="_blank"><span style="color:blue">pall@ous-hf.no</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Denne meldingen innholder ikke sensitiv informasjon som bryter med OUS sine regler for taushetsplikt<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Fra:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:eeglablist-bounces@sccn.ucsd.edu" target="_blank">eeglablist-bounces@sccn.ucsd.edu</a> [mailto:<a href="mailto:eeglablist-bounces@sccn.ucsd.edu" target="_blank">eeglablist-bounces@sccn.ucsd.edu</a>]
<b>På vegne av</b> Samaneh Valipour<br>
<b>Sendt:</b> 21. mai 2014 06:58<br>
<b>Til:</b> mmiyakoshi<br>
<b>Kopi:</b> <a href="mailto:eeglablist@sccn.ucsd.edu" target="_blank">eeglablist@sccn.ucsd.edu</a><br>
<b>Emne:</b> Re: [Eeglablist] Number of samples<u></u><u></u></span></p>
</div><div><div>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thanks a lot Dear Makoto.<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
<div>
<p class="MsoNormal">On Tue, May 20, 2014 at 10:03 PM, Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>> wrote:<u></u><u></u></p>
<div>
<p class="MsoNormal">Dear Samaneh,<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Samples you mean sampling points? Yes of course. The more sampling points you have, the better (i.e. smoother and more reliable) the results are.<u></u><u></u></p>
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<div>
<p class="MsoNormal"><u></u> <u></u></p>
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<div>
<p class="MsoNormal">Makoto<u></u><u></u></p>
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</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
<div>
<p class="MsoNormal">2014-05-19 21:31 GMT-07:00 Samaneh Valipour <<a href="mailto:samanehvalipour61@gmail.com" target="_blank">samanehvalipour61@gmail.com</a>>:<u></u><u></u></p>
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#783f04">Dear EEGLAB users,</span><u></u><u></u></p>
<div>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#783f04">I would like to be sure,whether the results of analysis of EEG using FFT or DWT depend on the number of samples?If is so, what is best choice for number of samples?</span><span style="font-family:"Arial","sans-serif";color:#888888"><br clear="all">
</span><span style="color:#888888"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:#888888">-- <u></u><u></u></span></p>
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<div>
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:blue">With very kind regards</span><span style="color:blue">,</span></b><span style="color:#888888"><br>
<br>
</span><b><span style="color:blue">Samaneh .Valipour</span></b><span style="color:#888888"><br>
<br>
</span><span style="color:blue">PhD research student: DOES_UOP_INDIA <br>
--------------------------------------------------------------------<br>
</span><span style="color:#888888">*Post address: *University of Pune, <br>
Pune Ganeshkhind, <br>
Pune-411007 ,<br>
Maharashtra, (India) *<br>
Phone nos :*<a href="tel:%2B91-20-25699841" target="_blank">+91-20-25699841</a>,<a href="tel:%2B91-20-25691256" target="_blank">+91-20-25691256</a>,<a href="tel:%2B91-20-25601419" target="_blank">+91-20-25601419</a><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:#888888"><u></u> <u></u></span></p>
</div>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
<p class="MsoNormal">_______________________________________________<br>
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</div>
<p class="MsoNormal"><span style="color:#888888"><br>
<br clear="all">
<span><u></u><u></u></span></span></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal"><span><span style="color:#888888">-- </span><u></u><u></u></span></p>
<div>
<p class="MsoNormal"><span style="color:#888888">Makoto Miyakoshi<br>
Swartz Center for Computational Neuroscience<br>
Institute for Neural Computation, University of California San Diego</span><u></u><u></u></p>
</div>
</div>
</div>
<p class="MsoNormal"><br>
<br clear="all">
<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal">-- <u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:blue">With very kind regards</span><span style="color:blue">,</span></b><br>
<br>
<b><span style="color:blue">Samaneh .Valipour</span></b><br>
<br>
<span style="color:blue">PhD research student: DOES_UOP_INDIA <br>
--------------------------------------------------------------------<br>
</span>*Post address: *University of Pune, <br>
Pune Ganeshkhind, <br>
Pune-411007 ,<br>
Maharashtra, (India) *<br>
Phone nos :*<a href="tel:%2B91-20-25699841" value="+912025699841" target="_blank">+91-20-25699841</a>,<a href="tel:%2B91-20-25691256" value="+912025691256" target="_blank">+91-20-25691256</a>,<a href="tel:%2B91-20-25601419" value="+912025601419" target="_blank">+91-20-25601419</a><u></u><u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
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</div></div></div>
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</blockquote></div></div></div><div><div class="h5"><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br>
</div>
</div></div></div>
</blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr"><div><font color="#0000ff"><b><span style="font-family:arial,helvetica,sans-serif;font-size:14px">With very kind regards</span>,</b></font><br><br><b><span style="color:rgb(0,0,255)">Samaneh .Valipour</span></b><br>
<br><font style="color:rgb(0,0,255)">PhD research student: DOES_UOP_INDIA <br>--------------------------------------------------------------------<br></font>*Post address: *University of Pune, <br> Pune Ganeshkhind, <br>
Pune-411007 ,<br> Maharashtra, (India) *<br>Phone nos :*+91-20-25699841,+91-20-25691256,+91-20-25601419<br></div><br></div>
</div>