In 2268, the instrument of obedience was used by the Oracle of Yonada to punish sacrilegious or contumely behavior. It appeared to operate in a manner similar to a neural servo. (TOS: "For the World is Hollow and I Have Touched the Sky" ) In 2370, Arctus Baran used neural servos, which were implanted in each member of his crew, as a means of maintaining obedience. (TNG: "Gambit, Part I" , "Gambit, Part II" ) Other examples of such devices were the various agonizers used by a number of species.