Arrahs, and Richese rehed extensively on tone to denote shades of meaning In those languages, however, tone was a digital aspect of language that required knowledge of the message code to be understood. Voice, on the other hand, registers on tile receiver and creates a compulsion to obey without any previous training or conditioning of the target That aspect of Voice requires that we engage in extensive speculation in an effort to deduce its function Sometime in the prehistoric background of the human race, our ancestors possessed more acute hearing, sharing with numerous lesser creatures the ability to perceive high-frequency sounds Although disuse has left us with no conscious ability to recognize or interpret such stimuli, rendering them extraperceptual, racial memory has locked mat knowledge in our unconscious Thus, segments of the auditory cortex are merely unused, as opposed to being uncommitted Those zones are actually committed but the information stored there is unavailable to the conscious mind Scholars conclude that extraperceptual auditory stimuli do impinge on the nervous system by exciting portions of the auditory cortex which feeds information only to the individual's unconscious Voice messages, therefore, go directly to tile unconscious, are not subject to scrutiny by the conscious will of the receiver and compliance requires no voluntary decision Bene Gessent adepts, of course, are able to monitor and control alt neural and physical functions of their bodies, permitting them to hear as well as generate such stimuli They, as a result, can use Voice to compel obedience from others while they themselves are resistant to Voice commands BACKGROUND The knowledge upon which the Bene Gesserit perfected Voice appears to have been drawn from two fields of traditional learning, physics and psychology Instrurnenta- tion capable of measuring neural activity was invented sometime during the early stages of the computer era which eventually led to the Butlenan Jihad It was at that time that our ancestors on Old Terra created numerous electronic toys of little practical value No doubt their lack of understanding regarding physical phenomena caused the mania for measuring such events Instruments for registering electrical variations in the central nervous system led to the discovery that sound waves outside the normal hearing range precipitated measurable neural activity Although primitive man probably was aware that certain animals could hear sounds humans could not, and that the human vocal mechanism could produce sounds outside the human hearing range, the distinction between hearing and neural sensitivity must have perplexed the early scientists The pre-Butlenan explanation for hearing was based on a mechanical-electrical process that would seem to indicate that the individual would ' hear" any acoustical stimulus within the range received by the physical apparatus Although modern science has gone well beyond such crude approximations the "we hear-what-we-cannot-hear" paradox was not fully explained until the secret Bene Gessent records were uncovered by current researchers Contemporary neuroscientists involved in the Rakis project agree that the Bene Gessent learned, probably with the help of spice, of the static barriers in the cortex (popularly called "force field boundanes' ) discovered less than a century ago by the legendary Sin Qadnn The study of psychology seems always to have been based on the theory that surface awareness is not all there is to be found in the human mind Although only Muad'Dib and his bloodline were successful in harnessing and us.