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?