Differential effects of a visual illusion on online visual guidance in a stable environment and online adjustments to perturbations

► Participants hit a ball to the vertex of a Müller-Lyer configuration. ► The shaft length tail orientation was perturbed during movement execution. ► Rapid online adjustments occurred. ► Illusion bias was observed in all perturbation conditions. ► Allocentric information is exploited rapidly for online adjustments.