Hello Fred and Fu,
I am not sure that A's and B's should be added like that. In principle they have the same dimensions, (1/second) but the meaning of summing or subtracting them is not clear to me specially when their absolute values are as far as I understand not important. As far as I understand their relative value is meaningful, so in your case Fred, you would be interested in their ratio
(-0.3)/(0.5)= -0.6. That can be interpreted as 60 % decrease of the effective connectivity due to the modulatory effect.
Kind regards
Branislava
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