Listing 's law persists .
Listing 's law takes on a torsional bias when the head is held at a tilted posture and the eyes counter-roll , and when the head is held steady upward or downward Listing 's plane tilts slightly in the opposite direction .
Listing 's law persists but takes on a torsional bias when the head is held at a tilted posture and the eyes counter-roll , and when the head is held steady upward or downward Listing 's plane tilts slightly in the opposite direction .