[FieldTrip] Phase-amplitude coupling (PAC)

Gregor Volberg gregor.volberg at psychologie.uni-regensburg.de
Fri May 3 09:35:40 CEST 2013

Dear Emilio,

I might not be fully up to date with the functionality of 
ft_connectivityanalysis, but as much as I know there is some 
preprocessing necessary to get a phase-to-amplitude coupling. A common 
strategy is to compute a Hilbert transform on the upper frequency band. 
This can be used to get the 'analytic amplitude', which is essentially a 
waveform that connects the amplitude peaks of the higher frequency. If 
the gamma amplitude is driven by the theta phase, then the analytic 
waveform  should be phase-locked with the theta cycle. The latter part 
of the analysis could be performed with the option 'plv' in 
For the processing steps you might want to have a look at an example 
script  at http://fieldtrip.fcdonders.nl/example/crossfreq/phalow_amphigh.

Best regards,

Am 02.05.2013 23:07, schrieb Emilio Valadez:
> Dear FieldTrippers,
> I am trying to compute phase-amplitude coupling (PAC) between the phase
> of theta activity at one channel and the amplitude of gamma activity at
> another channel over a specific time window within trials. I have read
> that PAC is captured with a phase-locking value (PLV), which leads me to
> think that this might be computed with ft_connectivityanalysis. If this
> is true, what would the configuration structure and input data need to
> look like? Or, is there an alternative way to compute PAC using
> FieldTrip? Thank you in advance!
> All the best,
> Emilio
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Dr. rer. nat. Gregor Volberg
Institut für Psychologie
Universität Regensburg
Universitätsstraße 31
D-93053 Regensburg, Germany
Tel: +49 941 943 3862
Fax: +49 941 943 3233

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