<div dir="ltr">Dear Leonardo,<div><br></div><div><div>> 1- Does that mean, I can't do time-frequency analysis using "Time-frequency transforms" of EEGLAB because I don't have epochs in my data)? Is this could be a limitation of Time-frequency transforms (only dealing withe epoch data rather than continuous one)?</div><div><br></div><div>I think EEGLAB GUI also let you transform continuous EEG into time-frequency data. If you call pop_newtimef() or newtimef() function, it is absolutely possible.</div><div><br></div><div>> 2- In same "Time-frequency transforms" option, what is the meaning of the word "log" that we find it in both "Log spaced" and "log power" parameters?</div><div><br></div><div>If you linear-space 1 to 10,</div><div><br></div><div><div>linspace(1,10,10)</div><div><br></div><div>ans =</div><div><br></div><div> 1 2 3 4 5 6 7 8 9 10</div></div><div><br></div><div>If you log-space 1 to 10,</div><div><br></div><div><div>>> logspace(log10(1),log10(10),10)</div><div><br></div><div>ans =</div><div><br></div><div> 1.0000 1.2915 1.6681 2.1544 2.7826 3.5938 4.6416 5.9948 7.7426 10.0000</div></div><div><br></div><div>For frequency plot, always use log scale. It'll weight 4-8Hz theta and 40-80Hz gamma equally.</div><div><br></div><div>> 3- For baseline, when to select the option "Use standard deviation (STD)", "Single trial DIV baseline", and "Single trial STD baseline"? When we change from one to another, does that change the dB unit or not, knowing that the default option "Use divisive baseline" produces bar column in dB. However, this bar color will be changed (e.g., std.) when we change the option into "Use Single trial STD baseline".</div></div><div><br></div><div>I believe the difference is how to take the baseline. It's my guess but sounds like the default is the std of the baseline period after averaging, while the 'single trial' option calculates it at single trials (I don't know exactly how). The dB unit will be the same, but the baseline values would be different since they are differently calculated.</div><div><br></div><div>Makoto</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Dec 3, 2015 at 9:42 AM, Leonardo Lion <span dir="ltr"><<a href="mailto:llionname@gmail.com" target="_blank">llionname@gmail.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"><div dir="ltr">Hi everyone, <div><br></div><div>My question is about applying ht e Time- frequency analysis on my continuous dataset (I don't have any epoch in the data).</div><div><br></div><div>In the EEGLAB, under the "Time-frequency transforms" option, there is a parameter called "Sub-epoch time limits". In the help of this parameter was written that "sub epochs may be extracted (note that this function aims at plotting data epochs not continuous data). You may select the new epoch limits in this edit box".</div><div><br></div><div><br></div><div>1- Does that mean, I can't do time-frequency analysis using "Time-frequency transforms" of EEGLAB because I don't have epochs in my data)? Is this could be a limitation of Time-frequency transforms (only dealing withe epoch data rather than continuous one)?</div><div><br></div><div>2- In same "Time-frequency transforms" option, what is the meaning of the word "log" that we find it in both "Log spaced" and "log power" parameters?</div><div><br></div><div>3- For baseline, when to select the option "Use standard deviation (STD)", "Single trial DIV baseline", and "Single trial STD baseline"? When we change from one to another, does that change the dB unit or not, knowing that the default option "Use divisive baseline" produces bar column in dB. However, this bar color will be changed (e.g., std.) when we change the option into "Use Single trial STD baseline".</div><div><br></div><div><br></div><div>Kind regards, </div><span class=""><font color="#888888"><div>Leonardo </div></font></span></div>
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