Figure 1.

Frequencies of rocking (A) and swaying (B) in Mal de Debarquement Syndrome patients (2). The frequencies were determined on a Nintendo Wii board. The rocking frequencies were tightly centered around a maximum at 0.2 Hz, more for the rocking than the swaying. When there was no actual rocking or swaying, the perceived frequencies were determined with the elbow stabilized on a board, and the patient moved the forearm at the frequency of the perceived movement.