Perception of the Relative Size of Volumetric Shapes in Virtual Reality. Gunasekera, I., Teng, X., Afolabi, F., Abadi, R., Allison, R. S, & Wilcox, L. M In ECVP 2024 Abstracts, Perception, pages 84-85. Sage Publications Inc, 2024. ![Perception of the Relative Size of Volumetric Shapes in Virtual Reality [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
Paper -1 abstract bibtex 1 download Research on size perception has focussed primarily on its interaction with egocentric distance to maintain size constancy. Less attention has been paid to factors influencing our ability to judge relative size under more natural conditions. Here, we evaluate the contribution of monocular and binocular depth information under conditions where observers passively view or actively engage with the stimuli. Stimuli were presented using a virtual reality (VR) headset. Participants (n = 15) viewed a virtual rendition of a children's shape-posting toy at a distance of 0.8 m. On a given trial, one of four size-matched shapes (triangle, square, pentagon, or clover) appeared beside the box for 4 s. The shape's size relative to its target slot was varied across trials using a method of constant stimuli with seven levels centred on the correct size. Participants indicated if the target shape was larger than the slot. In the first study, participants could not interact with the shape. In another experiment, the participants (n = 11) could pick up the shape with a tool and view it from different orientations for 5 s. Cumulative normal distributions were fit to individual data to calculate JNDs and PSEs and averaged across observers. We found that size discrimination was accurate across conditions; PSEs were close to, but slightly less than a size ratio of 1. As expected, JNDs were consistently lower in the binocular viewing condition for both passive and active conditions. The ability to interact with the objects only slightly improved performance in the monocular conditions despite the addition of motion-based shape information. In ongoing studies we are evaluating the role of individual sources of depth information and shape complexity. The results highlight the importance of stereopsis in judgements of relative size for natural stimuli. Acknowledgements: Vision: Science to Applications (VISTA). NSERC
@incollection{Gunasekera:2024ix,
abstract = {Research on size perception has focussed primarily on its interaction with egocentric distance to maintain size constancy. Less attention
has been paid to factors influencing our ability to judge relative size under more natural conditions. Here, we evaluate the contribution
of monocular and binocular depth information under conditions where observers passively view or actively engage with the stimuli.
Stimuli were presented using a virtual reality (VR) headset. Participants (n = 15) viewed a virtual rendition of a children's shape-posting
toy at a distance of 0.8 m. On a given trial, one of four size-matched shapes (triangle, square, pentagon, or clover) appeared beside the
box for 4 s. The shape's size relative to its target slot was varied across trials using a method of constant stimuli with seven levels centred
on the correct size. Participants indicated if the target shape was larger than the slot. In the first study, participants could not interact
with the shape. In another experiment, the participants (n = 11) could pick up the shape with a tool and view it from different orientations
for 5 s. Cumulative normal distributions were fit to individual data to calculate JNDs and PSEs and averaged across observers. We found
that size discrimination was accurate across conditions; PSEs were close to, but slightly less than a size ratio of 1. As expected, JNDs were
consistently lower in the binocular viewing condition for both passive and active conditions. The ability to interact with the objects only
slightly improved performance in the monocular conditions despite the addition of motion-based shape information. In ongoing studies
we are evaluating the role of individual sources of depth information and shape complexity. The results highlight the importance of
stereopsis in judgements of relative size for natural stimuli.
Acknowledgements: Vision: Science to Applications (VISTA). NSERC},
annote = {Aberdeen Sept 2024},
author = {Iroshini Gunasekera and Xue Teng and Faruq Afolabi and Romina Abadi and Robert S Allison and Laurie M Wilcox},
booktitle = {ECVP 2024 Abstracts, Perception},
date-added = {2025-06-21 08:07:55 -0400},
date-modified = {2025-06-21 08:07:55 -0400},
keywords = {Augmented & Virtual Reality},
pages = {84-85},
publisher = {Sage Publications Inc},
title = {Perception of the Relative Size of Volumetric Shapes in Virtual Reality},
url = {https://journals.sagepub.com/pb-assets/cmscontent/PEC/ECVP%202024%20Abstracts-1742366759.pdf},
url-1 = {https://journals.sagepub.com/pb-assets/cmscontent/PEC/ECVP%202024%20Abstracts-1742366759.pdf},
year = {2024},
bdsk-url-1 = {https://journals.sagepub.com/pb-assets/cmscontent/PEC/ECVP%202024%20Abstracts-1742366759.pdf}}
Downloads: 1
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On a given trial, one of four size-matched shapes (triangle, square, pentagon, or clover) appeared beside the box for 4 s. The shape's size relative to its target slot was varied across trials using a method of constant stimuli with seven levels centred on the correct size. Participants indicated if the target shape was larger than the slot. In the first study, participants could not interact with the shape. In another experiment, the participants (n = 11) could pick up the shape with a tool and view it from different orientations for 5 s. Cumulative normal distributions were fit to individual data to calculate JNDs and PSEs and averaged across observers. We found that size discrimination was accurate across conditions; PSEs were close to, but slightly less than a size ratio of 1. As expected, JNDs were consistently lower in the binocular viewing condition for both passive and active conditions. The ability to interact with the objects only slightly improved performance in the monocular conditions despite the addition of motion-based shape information. In ongoing studies we are evaluating the role of individual sources of depth information and shape complexity. The results highlight the importance of stereopsis in judgements of relative size for natural stimuli. Acknowledgements: Vision: Science to Applications (VISTA). 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Less attention\nhas been paid to factors influencing our ability to judge relative size under more natural conditions. Here, we evaluate the contribution\nof monocular and binocular depth information under conditions where observers passively view or actively engage with the stimuli.\nStimuli were presented using a virtual reality (VR) headset. Participants (n = 15) viewed a virtual rendition of a children's shape-posting\ntoy at a distance of 0.8 m. On a given trial, one of four size-matched shapes (triangle, square, pentagon, or clover) appeared beside the\nbox for 4 s. The shape's size relative to its target slot was varied across trials using a method of constant stimuli with seven levels centred\non the correct size. Participants indicated if the target shape was larger than the slot. In the first study, participants could not interact\nwith the shape. In another experiment, the participants (n = 11) could pick up the shape with a tool and view it from different orientations\nfor 5 s. Cumulative normal distributions were fit to individual data to calculate JNDs and PSEs and averaged across observers. We found\nthat size discrimination was accurate across conditions; PSEs were close to, but slightly less than a size ratio of 1. As expected, JNDs were\nconsistently lower in the binocular viewing condition for both passive and active conditions. The ability to interact with the objects only\nslightly improved performance in the monocular conditions despite the addition of motion-based shape information. In ongoing studies\nwe are evaluating the role of individual sources of depth information and shape complexity. The results highlight the importance of\nstereopsis in judgements of relative size for natural stimuli.\nAcknowledgements: Vision: Science to Applications (VISTA). 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