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1 Introduction While a number of senses are known to be involved in self-motion perception, visual

Summary: 1 Introduction
While a number of senses are known to be involved in self-motion perception, visual
and vestibular information appear to dominate this experience (eg Dichgans and
Brandt 1978). Unlike vision, which can detect any type of self-motion(1) on the basis of
the observer's optic flow, the vestibular system can detect only accelerating self-motions
from the inertia of the fluid in the semicircular canals and otoliths (Benson 1990). As
a result, the vestibular system is unable to distinguish between travelling at a constant
linear velocity and remaining stationary (Lishman and Lee 1973). Many studies of visual
illusions of self-motion (vection) have used this limitation of the vestibular system
to minimise the visual ^ vestibular conflicts experienced by their stationary observers
(eg Andersen and Braunstein 1985; Palmisano 1996, 2002; Telford and Frost 1993;
Telford et al 1992). These studies all used displays that simulated constant-velocity
linear self-motions. The logic that underlies this choice of inducing display is formalised
by visual ^ vestibular conflict theory (eg Zacharias and Young 1981).
According to this theory, when stationary observers are first presented with optic
flow simulating self-motion, they initially feel that they are stationary owing to the
following sensory conflictötheir visual input is consistent with self-motion, but they
have not yet received vestibular input to indicate that they have accelerated up from
rest. If their optic flow simulates large and frequent changes to the direction/magni-
tude of the self-motion, then this sensory conflict will persist and prevent the induction


Source: Allison, Robert - Department of Computer Science, York University (Toronto)


Collections: Computer Technologies and Information Sciences; Biology and Medicine