[FieldTrip] optimum number of cycles

[Rodolphe Nenert]

Dear filedtrippers, i had a question regarding the time-frequency analysis,
such as the one that can be found on the tutorial :
http://fieldtrip.fcdonders.nl/tutorial/timefrequencyanalysis

In the fixed-widow example, using a hanning taper, it is said that a fixed
widow of 500 ms can estimate power of different frequency bands like 2 Hz,
4Hz, etc...
However, for 2 Hz it means only 1 cycle.

In the frequency-dependent window length, 7 cycles per frequency bands are
used.

My questions are, is it ok to estimate a power with one cycle? What could
be the optimum number of cycles? Is ot ok to compare the power of different
frequency bands that have been estimated using a different number of cycles?

Thanks a lot,

Rodolphe.
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