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Instability of the perceived world while watching 3D stereoscopic imagery: A likely source of motion sickness symptoms.

Hwang AD, Peli E - Iperception (2014)

Bottom Line: Numerous studies have reported motion-sickness-like symptoms during stereoscopic viewing, but no causal linkage between specific aspects of the presentation and the induced discomfort has been explicitly proposed.Here, we describe several causes, in which stereoscopic capture, display, and viewing differ from natural viewing resulting in static and, importantly, dynamic distortions that conflict with the expected stability and rigidity of the real world.This analysis provides a basis for suggested changes to display systems that may alleviate the symptoms, and suggestions for future studies to determine the relative contribution of the various effects to the unpleasant symptoms.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Schepens Eye Research Institute, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA; e-mail: alex_hwang@meei.harvard.edu.

ABSTRACT
Watching 3D content using a stereoscopic display may cause various discomforting symptoms, including eye strain, blurred vision, double vision, and motion sickness. Numerous studies have reported motion-sickness-like symptoms during stereoscopic viewing, but no causal linkage between specific aspects of the presentation and the induced discomfort has been explicitly proposed. Here, we describe several causes, in which stereoscopic capture, display, and viewing differ from natural viewing resulting in static and, importantly, dynamic distortions that conflict with the expected stability and rigidity of the real world. This analysis provides a basis for suggested changes to display systems that may alleviate the symptoms, and suggestions for future studies to determine the relative contribution of the various effects to the unpleasant symptoms.

No MeSH data available.


Related in: MedlinePlus

The effect of gaze shifts on AD as a function of eccentricity while the viewer's head remains centered. The ADs of all nine objects are shown for each gaze (fixation) position. In the first two rows (panels a–f), legend symbols distinguish gaze position, not objects rows, with all nine objects per gaze having the same symbol. Panels (a), (b), and (c) show the ADs with S3D viewing, each with three gaze positions overlaid (for fixations on the objects in first row, second row, and third row, respectively). Panels (d–f) show the corresponding ADs during natural viewing. Panels (g–i) plot the arithmetic difference between the S3D and natural ADs as a function of VE, with symbols representing gazed objects, O1–O9. The amount of the depth distortion is largely independent of aiming distance (vergence angle), but is substantial at larger VEs.
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Figure 9: The effect of gaze shifts on AD as a function of eccentricity while the viewer's head remains centered. The ADs of all nine objects are shown for each gaze (fixation) position. In the first two rows (panels a–f), legend symbols distinguish gaze position, not objects rows, with all nine objects per gaze having the same symbol. Panels (a), (b), and (c) show the ADs with S3D viewing, each with three gaze positions overlaid (for fixations on the objects in first row, second row, and third row, respectively). Panels (d–f) show the corresponding ADs during natural viewing. Panels (g–i) plot the arithmetic difference between the S3D and natural ADs as a function of VE, with symbols representing gazed objects, O1–O9. The amount of the depth distortion is largely independent of aiming distance (vergence angle), but is substantial at larger VEs.

Mentions: Figure 9 illustrates the effect of gaze shifts, while the viewer's head remains centered. Note that if no depth distortion is introduced in the scene capture and projection, the S3D ADs of Figure 9a–c should have the same shape as those for the natural views of Figure 9d–f. However, the S3D scene as perceived by the viewer shows substantial AD distortions (differences from natural viewing, as shown in Figure 9g–i), which unavoidably introduce perceptual changes in apparent depth structure. Even though it is possible to achieve binocular fusion at most of the AD values, the magnitude of the depth distortion at higher eccentricities is substantial.


Instability of the perceived world while watching 3D stereoscopic imagery: A likely source of motion sickness symptoms.

Hwang AD, Peli E - Iperception (2014)

The effect of gaze shifts on AD as a function of eccentricity while the viewer's head remains centered. The ADs of all nine objects are shown for each gaze (fixation) position. In the first two rows (panels a–f), legend symbols distinguish gaze position, not objects rows, with all nine objects per gaze having the same symbol. Panels (a), (b), and (c) show the ADs with S3D viewing, each with three gaze positions overlaid (for fixations on the objects in first row, second row, and third row, respectively). Panels (d–f) show the corresponding ADs during natural viewing. Panels (g–i) plot the arithmetic difference between the S3D and natural ADs as a function of VE, with symbols representing gazed objects, O1–O9. The amount of the depth distortion is largely independent of aiming distance (vergence angle), but is substantial at larger VEs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4441027&req=5

Figure 9: The effect of gaze shifts on AD as a function of eccentricity while the viewer's head remains centered. The ADs of all nine objects are shown for each gaze (fixation) position. In the first two rows (panels a–f), legend symbols distinguish gaze position, not objects rows, with all nine objects per gaze having the same symbol. Panels (a), (b), and (c) show the ADs with S3D viewing, each with three gaze positions overlaid (for fixations on the objects in first row, second row, and third row, respectively). Panels (d–f) show the corresponding ADs during natural viewing. Panels (g–i) plot the arithmetic difference between the S3D and natural ADs as a function of VE, with symbols representing gazed objects, O1–O9. The amount of the depth distortion is largely independent of aiming distance (vergence angle), but is substantial at larger VEs.
Mentions: Figure 9 illustrates the effect of gaze shifts, while the viewer's head remains centered. Note that if no depth distortion is introduced in the scene capture and projection, the S3D ADs of Figure 9a–c should have the same shape as those for the natural views of Figure 9d–f. However, the S3D scene as perceived by the viewer shows substantial AD distortions (differences from natural viewing, as shown in Figure 9g–i), which unavoidably introduce perceptual changes in apparent depth structure. Even though it is possible to achieve binocular fusion at most of the AD values, the magnitude of the depth distortion at higher eccentricities is substantial.

Bottom Line: Numerous studies have reported motion-sickness-like symptoms during stereoscopic viewing, but no causal linkage between specific aspects of the presentation and the induced discomfort has been explicitly proposed.Here, we describe several causes, in which stereoscopic capture, display, and viewing differ from natural viewing resulting in static and, importantly, dynamic distortions that conflict with the expected stability and rigidity of the real world.This analysis provides a basis for suggested changes to display systems that may alleviate the symptoms, and suggestions for future studies to determine the relative contribution of the various effects to the unpleasant symptoms.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Schepens Eye Research Institute, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA; e-mail: alex_hwang@meei.harvard.edu.

ABSTRACT
Watching 3D content using a stereoscopic display may cause various discomforting symptoms, including eye strain, blurred vision, double vision, and motion sickness. Numerous studies have reported motion-sickness-like symptoms during stereoscopic viewing, but no causal linkage between specific aspects of the presentation and the induced discomfort has been explicitly proposed. Here, we describe several causes, in which stereoscopic capture, display, and viewing differ from natural viewing resulting in static and, importantly, dynamic distortions that conflict with the expected stability and rigidity of the real world. This analysis provides a basis for suggested changes to display systems that may alleviate the symptoms, and suggestions for future studies to determine the relative contribution of the various effects to the unpleasant symptoms.

No MeSH data available.


Related in: MedlinePlus