from IBVA V4.9.5.3 coherence shows 0 .. 90 degree phase difference and eliminate left & right sampling first difference.

from IBVA V4.8.9 to IBVA V4.9.5.2 coherence shows 0 .. 90 degree phase difference.

until IBVA V4.8.8 coherence shows 0 .. 45 degree phase difference.

following images shows coherence difference that use sample files from

Applications / IBVA4 / brain data sample /

A: AlphaInTheCropCircle

B: AlphaBig

ps. those files are included in the IBVA4 DVD

A: Top IBVA V4.9.5.3, Bottom V4.8.8

B: Top IBVA V4.9.5.3, Bottom V4.8.8