Abstract
I thank Dr. Herdman for her insightful discussion of our work. To continue this discourse, it first is necessary to clarify that this study was an examination of standing equilibrium and not of perception. The relevance of those studies1–3 in which peripheral field motion either induced vection or altered perception of straight-ahead or vertical motion lies in their demonstration of the profound visual influence that vision has over spatial orientation. In such studies, eye movements were not directed but, in most cases, followed the optokinetic response pattern of alternate smooth pursuit eye movements (SPEMs) and saccadic eye movements. In our study, the eyes moved and the visual field remained stationary. With regard to SPEMs, the subjects did not have the perceptual illusion of either visual field motion or self-motion. They instead were prevented from using the visual field as a stable frame of reference to discern body shifts.
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