Speaker
Description
Previous research has shown that visual stimuli presented across eye movements can distort time and space perception. Interestingly, introducing a full-field visual mask within 40 milliseconds after two brief visual events can reverse temporal judgments, even in the absence of eye movements. We explored whether the spatial characteristics of the mask could influence this temporal inversion effect. Specifically, we asked if a mask that was not superimposed on the visual stimuli was sufficient to induce the inversion illusion. In Experiment one, participants judged the temporal order of a test/probe stimulus pair under three conditions: no mask, a full-field mask, or a partial-field mask covering only the top and bottom third of the screen, but not the stimuli location. Masks appeared at various intervals after the probe stimulus. The inversion effect was visible with both full and partial-masks when presented within 30 milliseconds of the probe. In control measurements (Experiment two), delaying the mask’s presentation relative to the probe abolished the effect. Experiment three was identical to Experiment one, but this time the mask was presented either in the ipsilateral visual field as the stimuli or in the contralateral hemifield. Both positions triggered a temporal inversion effect, although weaker with the contralateral mask. These findings suggest that the temporal inversion effect can be reliably induced also by masks not overlapping with the stimuli, indicating that the effect might be linked to a non-spatial signal, coupled with mask presentation timing.
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