Different results using multitapers and wavelet
bleichner.martin at GMAIL.COM
Mon Dec 1 14:47:42 CET 2008
I am using multitapers as well as wavelets to compute my time frequency
spectrum of ECoG data (50Hz-90Hz). Recently I realized some discrepancy
using these two methods, until than I found that these to method lead to
In one of our datasets we found very large differences between the two
methods. When I looked closer at the problem I found out that the two
methods lead to similar results when the effect (increase in power) is
large, while they deviate quite a bit when the effect is small.
In that case i get a kind of 'checkerboard' like time frequency spectrum
for the mutlitapers.
I also compared the output of the frequency analysis with the bandpassed raw
signal and found that the wavelet transform was the better match. A
re there any prerequisites for multitaper use? Does anybody has some
experience with this effect? Do I do something wrong?
Below you can find the cfg settings I am using
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