[FieldTrip] ft_freqanalysis and optimal parameters for higher frequency

Grazia Di Pisa g.dipisa at gmail.com
Thu Sep 3 19:28:13 CEST 2015

Hi all,

I’m doing time-frequency analysis based on multitapers since I’m trying to analyse activity in the gamma band frequency from 30 to 80 Hz.

I’m getting some strange plots and from the tutorial I don’t understand how to optimally choose some parameters, in particular for cfg.t_ftimwin and cfg.tapsmofrq.

Currently, I’m using the following:

cfg = [];
    cfg.output     = 'pow';
    cfg.channel    = 'EEG';
    cfg.method     = 'mtmconvol';
    cfg.toi        = [-1.0 : 0.05 : 2.5]; 
    cfg.foi        = [30:2:80]; 
    cfg.t_ftimwin  = 5./cfg.foi;  
    cfg.tapsmofrq  = 0.4*cfg.foi; 

Sorry for the very basic question, but I’m a beginner so some explanations and suggestions would be really helpful!

Thanks in advance,
~ grazia

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