[FieldTrip] Pairwise Phase Conistency (PPC) in 2 channel EEG

[Schoffelen, J.M. (Jan Mathijs)]

Hi Vijay,

The best way to get started is to use the higher level function ft_connectivityanalysis, with cfg.method = ‘ppc’. Note that the data matrix needs to have an observation/trial dimension, so just a single 1xnfreq channel-pair csd will not fly. I suggest to search the documentation of fieldtriptoolbox.org<http://fieldtriptoolbox.org> to get more information

Best wishes,
Jan-Mathijs

J.M.Schoffelen, MD PhD
Associate PI, VIDI-fellow - PI, language in interaction
Telephone: +31-24-3614793
Physical location: room 00.028
Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands



On 13 May 2019, at 19:27, Vijay Sadashivaiah <vjs at libd.org<mailto:vjs at libd.org>> wrote:


Hello,

I apologize for this novice question - I'm pretty new to working with EEG signals.

I'm trying to use the ft_connectivity_ppc.m function to calculate the PPC between two channels of EEG. The shape of the input_matrix is defined as Repetitions X channel X channel. If I'm inputting the CSD between two channels, It will be a one dimensional vector instead of two dimensions, and this doesn't satisfy the input_matrix requirements.

Am I missing something here? Any help is appreciated.

Thanking you, I remain,
Vijay Sadashivaiah

Research Associate,
Data Science and Computational Biology,
Lieber Institute for Brain Development,
Johns Hopkins Medical Institute, MD 21205
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