[FieldTrip] Problems plotting TFR with different frequency sacle

Haiteng Jiang haiteng.jiang at gmail.com
Wed Sep 19 15:39:15 CEST 2012

Dear  Fieldtripers ,
    I  try to plot  the TFR with Fieldtrip , but I find the frequency shift
in the  plotting when I use different frequency scale. Please see the
attached two examples (4-30Hz versus 4-100Hz).  The TFR within 4-30Hz is
centered in alpha band while it is switched to beta band with the 4-100Hz.
scale . Regarding to the TFR,   I calculate it by using an adaptive sliding
time window of four cycles length (Δt = 4/f) and a Hanning taper for lower
frequencies (4–30 Hz), and a sliding time window of fixed length (200ms)
and three orthogonal Slepian tapers resulting in ±10 Hz smoothing (29) for
higher frequencies (30–100 Hz).
   Any suggestion ?
                                                             All the best,
Haiteng Jiang
PhD candidate
Neuronal Oscillations Group
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen

Visiting address
Room 2.32
Donders Centre for Cognitive Neuroimaging
Kapittelweg 29
6525 EN  Nijmegen
the Netherlands

 Tel.: +31 (0)243668291
 Web:  https://sites.google.com/site/haitengjiang/
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