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Elena Orekhova wrote:
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<p class="MsoNormal"><font face="Courier New" size="2"><span
style="font-size: 10pt; font-family: "Courier New";">Dear EEGLab users<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Courier New" size="2"><span
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Courier New" size="2"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-GB">Does
anybody know the reason
to use particular ‘wavletcycles fastor’ in timef function?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Courier New" size="2"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-GB">Certainly,
the picture looks
better with the default 0.5 factor, than with both 1 or 0 factors, but
can it
be misleading? Intuitively, factor 1 (no increase standard wavelets)
seems to
be more precise, is not it?</span></font></p>
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Yes, "wavelet factor 1" has a better time resolution at all
frequencies. We must use a low number of cycles at low frequencies (for
example 3 for 5-Hertz theta) otherwise the window size would be too big
(3 cycles at 5 Hertz is already 600 ms). However, at high frequency
this is not a problem (3 cycles at 40 Hertz is 7.5 ms) and it is better
to obtain a better frequency estimate by increasing the number of
cycles (using the wavelet cycle factor), which in turn decreases time
resolution. If you do not do that, some "blurring" effect appear at
high frequency. 0.5 means that the program will use a window size of
half the size at the lowest frequency. It is not ideal as a parameter.
A new version of the function we have designed (and will be releasing
soon) allow to set directly the number of cycle at the lowest frequency
and at the number of cycle at the highest plotted frequency.<br>
<br>
Best,<br>
<br>
Arno<br>
<br>
<blockquote
cite="mid921998AA01D89241BEBBE6BAD87FE8E415FC1C@exch01.neuro.gu.se"
type="cite">
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<p class="MsoNormal"><font face="Courier New" size="2"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-GB"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Courier New" size="2"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-GB">Elena<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB"><o:p> </o:p></span></font></p>
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