The perception of changes in visual movement feedback delay is biased by visuomotor congruence
The Weber-Fechner Laws have been evaluated across a wide variety of modalities and tasks, but not yet in the domain of visuomotor mapping. A prominent manipulation of visuomotor mapping is temporal; i.e., delaying visual movement feedback. Yet, while visuomotor delay detection itself has been extensively studied, it is not known whether the perception of changes in delay depends on the present amount of delay. We developed a virtual reality based, continuous hand movement task, during which participants had to detect changes in visuomotor mapping (delay): Participants (N=40) performed continuous, auditory-paced grasping movements, which were measured with a data glove and transmitted to a virtual hand model. The movements of the virtual hand were periodically delayed between 0-700ms; the delay changed repeatedly in a roving oddball fashion in steps of 100-400ms. Participants had to indicate perceived delay changes by key presses, as fast as possible. This design allowed us to investiga