Abstract
Peripheral visual stimuli were presented in conjunction with an autokinetic target to determine the influence of additional visual contour on the amount and direction of autokinetic movement. The addition of any peripheral stimulus resulted in a significant decrease in autokinesis. The greatest reduction occurred when peripheral stimuli were presented at near eccentricities and when the peripheral stimulus completely surrounded the autokinetic stimulus. Peripheral stimuli also influenced the direction of autokinesis. Stimuli placed at 1° eccentric to the autokinetic stimulus increased the amount of autokinetic motion in the direction away from the additional stimulus. Also, at more peripheral placements, a vertical bar increased autokinetic movement in the vertical plane. These results are interpreted within the context of the contribution of additional stimuli in the visual field to enhanced fixational stability.
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