Creepy Monotone: While they don’t really intend to, more than a few Imperials come off this way (even if it’s actually more of a calm monotone, really) to more naturally-emotive cultures.  It’s another minor drawback/side effect of the calmness/rationality/serenity that comes from having your emotional state managed and self-control enhanced by the artificial part of your brain – well, I say drawback, but that’s only from the point of view of baseline humans and other members of the appallingly emotionally labile set.

Also see: Dissonant Serenity.