Viewers' Sensitivity to Camera Motion during Saccades in a Virtual Environment

Viewers' Sensitivity to Camera Motion during Saccades in a Virtual Environment. Keyvanara, M. & Allison, R. In Proceedings of 20th European Conference on Eye Movements. Journal of Eye Movement Research, volume 12, pages 214. 2019.

-1 abstract bibtex

Gaze-contingent displays use real-time eye movement data to adjust the display content according to user's gaze. Display updates must happen fast enough to prevent the user from noticing them. Saccadic suppression helps hide these updates. The aim of this study was to investigate which image transformations are less perceptible and hence more applicable during saccadic suppression periods. We designed our experimental environments in Unity3D and used an Eyelink1000 to sample the participants' gaze in real time. Participants viewed 3D scenes in which the camera panned from left to right at a constant rotational velocity. During this motion they made a horizontal (lrightward) or vertical (downward) saccade during which a sudden movement of the camera transformed the image of the scene. Camera movements were one of 6 translation and 4 rotational directions. Following the trial participants indicated the direction of the change in a 2AFC task. Discrimination thresholds for each type of transformation were estimated using an adaptive procedure to fit a Weibull psychometric function. During both horizontal and vertical saccades, thresholds were higher for horizontal translational and rotational camera movements than for other transformations. Further experiments are being conducted to determine if this generalizes but the current results imply that the direction of camera motion affects the detectability of camera transitions during saccades. Understanding the relationship between on-going movements and the detectability of a sudden transsaccadic change can help provide a better user experience for users of VR that hide graphical updates when they generate a saccade.

@incollection{Keyvanara:2019rf,
	abstract = {Gaze-contingent displays use real-time eye movement data to adjust the display content according to user's
gaze. Display updates must happen fast enough to prevent the user from noticing them. Saccadic suppression
helps hide these updates. The aim of this study was to investigate which image transformations are less
perceptible and hence more applicable during saccadic suppression periods. We designed our experimental
environments in Unity3D and used an Eyelink1000 to sample the participants' gaze in real time. Participants
viewed 3D scenes in which the camera panned from left to right at a constant rotational velocity. During this
motion they made a horizontal (lrightward) or vertical (downward) saccade during which a sudden movement
of the camera transformed the image of the scene. Camera movements were one of 6 translation and 4
rotational directions. Following the trial participants indicated the direction of the change in a 2AFC task.
Discrimination thresholds for each type of transformation were estimated using an adaptive procedure to
fit a Weibull psychometric function. During both horizontal and vertical saccades, thresholds were higher for
horizontal translational and rotational camera movements than for other transformations. Further experiments
are being conducted to determine if this generalizes but the current results imply that the direction of camera
motion affects the detectability of camera transitions during saccades. Understanding the relationship
between on-going movements and the detectability of a sudden transsaccadic change can help provide a
better user experience for users of VR that hide graphical updates when they generate a saccade.},
	annote = {18-22 August 2019 Alicante Spain},
	author = {Keyvanara, Maryam and Allison, Robert},
	booktitle = {Proceedings of 20th European Conference on Eye Movements. Journal of Eye Movement Research},
	date-added = {2019-08-14 08:42:45 -0400},
	date-modified = {2019-12-25 22:28:04 -0500},
	journal = {Journal of Eye Movement Research},
	keywords = {Eye Movements & Tracking},
	number = {7},
	pages = {214},
	title = {Viewers' Sensitivity to Camera Motion during Saccades in a Virtual Environment},
	url-1 = {https://doi.org/10.1177/0301006618824879},
	volume = {12},
	year = {2019}}

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During this motion they made a horizontal (lrightward) or vertical (downward) saccade during which a sudden movement of the camera transformed the image of the scene. Camera movements were one of 6 translation and 4 rotational directions. Following the trial participants indicated the direction of the change in a 2AFC task. Discrimination thresholds for each type of transformation were estimated using an adaptive procedure to fit a Weibull psychometric function. During both horizontal and vertical saccades, thresholds were higher for horizontal translational and rotational camera movements than for other transformations. Further experiments are being conducted to determine if this generalizes but the current results imply that the direction of camera motion affects the detectability of camera transitions during saccades. 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