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We read with interest the article by Hain et al¹ on the intriguing phenomenon of mal de debarquement (MDD), or sickness of disembarkment. They described 27 subjects with persistent MDD, a pathological condition that was first reported by Brown and Baloh² in 1987. The pathogenesis of persistent MDD is unclear, and the clinical presentation is still not well defined.^2-4 This lack of clarity contrasts with the well-defined, more common physiological condition of MDD, a transient sensation of swaying, swinging, unsteadiness, and disequilibrium that occurs in some individuals after disembarkment, and is usually explained in terms of multisensorimotor adaptation and habituation to an abnormal motion environment.^5-8

Hain and colleagues recruited 27 subjects from a "dizzy population" (via an advertisement in the newsletter of the Vestibular Disorders Association) with persistent symptoms of rocking and swaying after exposure to unnatural motion. Because the subjects reported symptoms after exposure to motion on an airplane . . . [Full Text of this Article]