So whereas RV without feedback is possible it is certainly not provable without unbiased investigation and irrefutable proof of what exactly the feedback is or was meant to be. The term Matrix was originally coined by Ingo Swann. At the time it was just a convenient way of expressing a mental construct. Nothing more than one's unwritten but crystallised intention is needed to do this but the person should be a party to the actual feedback or knowledge eventually whilst learning. The part of the brain involved is the subconscious and to a lesser extent the right brain and the temporal lobes.
Most people try to reach a calm state before starting a session.
One way to do this is to listen to Baroque music, this is available by searching an index of music using simply the word 'Baroque'. This hopefully leads neatly into the subject of Associative Remote Viewing which was originally my personal field of interest. Dr James Spottiswode has been correlating many thousands of general RV sessions in the Northern Hemisphere including Europe, Canada and the USA and the Effect Scores they produced. A high effect score typically indicates a more accurate RV session. Sidereal Time is simply the time that our galaxy are in a particular place relative to the viewer.