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(A) View looking down on a schematic head with enlarged canals to show the approximated planes of the vertical canals. (B) The optimal horizontal eye position for using vHIT to measure vertical canal function: it is with gaze aligned with the canal plane under test (this is labeled 40° in the figures below). (C) If gaze is straight ahead (0°), the prediction is that the vertical component becomes much smaller. (The images are stills from the free iPhone app aVOR at the app store).
