Bene Gesserit
Bene Gesserit are trained in "the minutiae of observation", noticing details that the common person would miss in the people and environment around them. When combined with their analytical abilities, this "hyperawareness" makes the Bene Gesserit capable of divining secrets and arriving at conclusions that are invisible to everyone else. Slight differences in air currents or the design of a room might allow a Bene Gesserit to detect hidden portals and spyholes; minute variations in a person's vocal inflection and body language allow a Bene Gesserit to deeply understand a person's emotional state, and manipulate it. Knowing that any schooling impresses a particular pattern in its students, they are able to use these clues to predict and anticipate actions. Despite efforts of concealment, the Bene Gesserit can easily determine a subject's origins and root language by analyzing their speech patterns, cadence, and pacing, as Jessica does when she realizes that a visiting Spacing Guild banker is a Harkonnen agent.