Motion perception is a visual inference of motion based on the speed and direction of elements in the environment. The other sensory modalities that are involved in processing this directional information include vestibular and proprioceptive inputs. Complex computational and neural mechanisms appear to underlie the motion perception process, many of which require further investigation. In general, optic flow integrates the two-dimensional velocity vectors that indicate the direction and speed of motion of the elements in the surrounding environment (Harris and Jenkin 1993). With the addition of head movements, the processing of optic flow is limited and this is compensated for, in part, by motion signals from the vestibular otolith organs (Benson et al. 1986). The otoliths act as linear accelerometers and provide the basis for directional selectivity.
Visual and vestibular signals are integrated in motion processing sensitive brain regions (e.g., V5/MT) to achieve robust perception of...
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