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• W4312197524 abstract "Virtual reality (VR) has established itself as a useful tool in the study of human perception in the laboratory. A recent study introduced a new approach to examine visual sensory attenuation (SA) effects in VR. Hand movements triggered the appearance of Gabor stimuli, which were either presented behind the participant’s hand – not rendered in VR (“virtual occlusion”) - or elsewhere on the display. Virtual occlusion led to a rightward shift of the psychometric curve, suggesting that self-generated hand movements reduced the perceived contrast of the stimulus. Since such attenuation effects might provide a window into the predictive processing of the sensory and cognitive apparatus, we sought to better understand the nature of the virtual occlusion effects. In our study, the presentation of test stimuli was either self-initiated, self-initiated with a variable delay, or triggered externally; the test stimuli were occluded or not. In conflict with our hypothesis, we found moderate to strong evidence for an absence of any horizontal shifts between the psychometric curves. However, virtual occlusion was associated with a decrease in the slope of the psychometric function. Our results suggest that virtual occlusion attenuated the relative perceptual sensitivity, so that participants had more difficulty discriminating contrast differences when the test stimulus was presented behind the hand. We tentatively conclude that, in the visual domain, the discriminability of stimulus intensity is modified by internal predictive cues (i.e., proprioception), possibly linked to shifts in covert spatial attention." @default.
• W4312197524 created "2023-01-04" @default.
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• W4312197524 date "2023-01-01" @default.
• W4312197524 modified "2023-09-26" @default.
• W4312197524 title "Virtual occlusion effects on the perception of self-initiated visual stimuli" @default.
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• W4312197524 doi "https://doi.org/10.1016/j.concog.2022.103460" @default.
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