In case there are any Ender's Game fans here, the capability to understand micro-expressions reminds me of how Ender subvocalizes to Jane. Orson Scott Card predicted yet another technological norm.
The same basic developments of mental science that had brought about the development of the Seldon Plan, thus made it also unnecessary for the First Speaker to use words in addressing the Student.
Every reaction to a stimulus, however slight, was completely indicative of all the trifling changes, of all the flickering currents that went on in another's mind. The First Speaker could not sense the emotional content of the Student's instinctively, as the Mule would have been able to do – since the Mule was a mutant with powers not ever likely to become completely comprehensible to any ordinary man, even a Second Foundationer – rather he deduced them, as the result of intensive training.