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Abstract:
Spatial perception, the localization of stimuli in space, can rely on visual reference stimuli or on egocentric factors such as a stimulus position relative to eye gaze. In total darkness only an egocentric reference frame provides sufficient information. When stimuli are briefly flashed around saccades the localization error reveals potential mechanisms of updating such reference frames as described in several theories and computational models. Recent novel experimental evidence, however, showed that the maximum amount of mislocalization does not scale linearly with saccade amplitude but rather stays below 13◦ even for long saccades, which is different than predicted by present models. We propose a new model of peri-saccadic mislocalization in complete darkness to account for this observation. According to this model mislocalization arises not on the motor side by comparing a retinal position signal with an extraretinal eye position related signal but by updating stimulus position in visual areas through a combination of proprioceptive eye position and corollary discharge. Simulations with realistic input signals and temporal dynamics show that both signals together are used for spatial updating and in turn bring about peri-saccadic mislocalization.
