[FieldTrip] Instantaneous phase shift and Hilbert transform

[hyxer1998 at 163.com]

Hi, 
I’m trying to compare phase shift between two groups.

The phase shifts are time series:  
1. Calculate instantaneous phase on every time point by Hilbert transform. 
2. Time series after stimulus onset subtract times series before stimulus onset. Thus, I can get individual phase shifts related to stimulus. 

But, I have no idea how to realize it by FieldTrip. If anyone can help me, I will appreciate it very much. 

Best

He Yuxin