Hello,

I have a question regarding 'zero' coherence result for pairs that have different signals.

The way I calculated coherence is...

Connectivity - coherence N x N - time window (-1~6s (entire trial duration)) - use scouts (desikan-Killiany) and selected a total of 6 scouts - scout function (Mean) - scout function applied (Before) - Measure (Imaginary) - Max freq resolution (2Hz) - highest freq of interest (30 Hz)

Coherence results have 15 x 21 (15 = frequencies, 21 = all pairs ([scout1,scout1].....[scout6, scout6])

- in self coherence calculations (for example [scout1,scout1], it gave zero coherence value.
- but there are multi pairs that have '0's, not in self coherence results.

Can you explain whether different scout coherence calculation can be zero? and if so why?

Thank you,

Chang