Limits...
Reaching nearby sources: comparison between real and virtual sound and visual targets.

Parseihian G, Jouffrais C, Katz BF - Front Neurosci (2014)

Bottom Line: The current study concerns localization and pointing accuracy by examining source positions in the peripersonal space, specifically those associated with a typical tabletop surface.Results show no effect on the reporting hand with azimuthal errors increasing equally for the most extreme source positions.Various potential reasons for this discrepancy are discussed with several proposals for improving distance perception in peripersonal virtual environments.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Mécanique et d'Informatique pour les Sciences de l'Ingénieur, LIMSI - CNRS, Universite Paris Sud Orsay, France.

ABSTRACT
Sound localization studies over the past century have predominantly been concerned with directional accuracy for far-field sources. Few studies have examined the condition of near-field sources and distance perception. The current study concerns localization and pointing accuracy by examining source positions in the peripersonal space, specifically those associated with a typical tabletop surface. Accuracy is studied with respect to the reporting hand (dominant or secondary) for auditory sources. Results show no effect on the reporting hand with azimuthal errors increasing equally for the most extreme source positions. Distance errors show a consistent compression toward the center of the reporting area. A second evaluation is carried out comparing auditory and visual stimuli to examine any bias in reporting protocol or biomechanical difficulties. No common bias error was observed between auditory and visual stimuli indicating that reporting errors were not due to biomechanical limitations in the pointing task. A final evaluation compares real auditory sources and anechoic condition virtual sources created using binaural rendering. Results showed increased azimuthal errors, with virtual source positions being consistently overestimated to more lateral positions, while no significant distance perception was observed, indicating a deficiency in the binaural rendering condition relative to the real stimuli situation. Various potential reasons for this discrepancy are discussed with several proposals for improving distance perception in peripersonal virtual environments.

No MeSH data available.


Related in: MedlinePlus

Mean of all subjects' reported location with 50% confidence ellipse linked to source location for each rendering condition: visual (left), real sound (center), and virtual sound (right).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4151089&req=5

Figure 3: Mean of all subjects' reported location with 50% confidence ellipse linked to source location for each rendering condition: visual (left), real sound (center), and virtual sound (right).

Mentions: The mean reported positions linked to target locations for each rendering condition are presented in Figure 3 with 50% confidence ellipse. These plots allow one to evaluate the error bias across the three conditions. For visual sources, lateral localization accuracy is quite good while the nearest distances are overestimated. For real sound sources, the reported distance is compressed and a lateral shift appears mostly at −60° and 60°. For virtual sound sources, all lateral sources are shifted toward the sides and there is no apparent distance perception. In the following sections these results are analyzed in terms of azimuth and distance bias and dispersion.


Reaching nearby sources: comparison between real and virtual sound and visual targets.

Parseihian G, Jouffrais C, Katz BF - Front Neurosci (2014)

Mean of all subjects' reported location with 50% confidence ellipse linked to source location for each rendering condition: visual (left), real sound (center), and virtual sound (right).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4151089&req=5

Figure 3: Mean of all subjects' reported location with 50% confidence ellipse linked to source location for each rendering condition: visual (left), real sound (center), and virtual sound (right).
Mentions: The mean reported positions linked to target locations for each rendering condition are presented in Figure 3 with 50% confidence ellipse. These plots allow one to evaluate the error bias across the three conditions. For visual sources, lateral localization accuracy is quite good while the nearest distances are overestimated. For real sound sources, the reported distance is compressed and a lateral shift appears mostly at −60° and 60°. For virtual sound sources, all lateral sources are shifted toward the sides and there is no apparent distance perception. In the following sections these results are analyzed in terms of azimuth and distance bias and dispersion.

Bottom Line: The current study concerns localization and pointing accuracy by examining source positions in the peripersonal space, specifically those associated with a typical tabletop surface.Results show no effect on the reporting hand with azimuthal errors increasing equally for the most extreme source positions.Various potential reasons for this discrepancy are discussed with several proposals for improving distance perception in peripersonal virtual environments.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Mécanique et d'Informatique pour les Sciences de l'Ingénieur, LIMSI - CNRS, Universite Paris Sud Orsay, France.

ABSTRACT
Sound localization studies over the past century have predominantly been concerned with directional accuracy for far-field sources. Few studies have examined the condition of near-field sources and distance perception. The current study concerns localization and pointing accuracy by examining source positions in the peripersonal space, specifically those associated with a typical tabletop surface. Accuracy is studied with respect to the reporting hand (dominant or secondary) for auditory sources. Results show no effect on the reporting hand with azimuthal errors increasing equally for the most extreme source positions. Distance errors show a consistent compression toward the center of the reporting area. A second evaluation is carried out comparing auditory and visual stimuli to examine any bias in reporting protocol or biomechanical difficulties. No common bias error was observed between auditory and visual stimuli indicating that reporting errors were not due to biomechanical limitations in the pointing task. A final evaluation compares real auditory sources and anechoic condition virtual sources created using binaural rendering. Results showed increased azimuthal errors, with virtual source positions being consistently overestimated to more lateral positions, while no significant distance perception was observed, indicating a deficiency in the binaural rendering condition relative to the real stimuli situation. Various potential reasons for this discrepancy are discussed with several proposals for improving distance perception in peripersonal virtual environments.

No MeSH data available.


Related in: MedlinePlus