Adaptation of egocentric distance perception under telestereoscopic viewing within reaching space

Priot, Anne-Emmanuelle; Laboissière, Rafaël; Sillan, Olivier; Roumes, Corinne; Prablanc, Claude

doi:10.1007/s00221-010-2188-4

Cited by 16 publications

(15 citation statements)

References 56 publications

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“…EMPrelated aftereffects in the two experiments should be similar, as the target sequence and visual and oculomotor tasks were exactly the same. Thus, by comparing visual aftereffects in the main and control experiments, it was possible to assess the visual recalibration component (Priot, Laboissière, Sillan, Roumes, & Prablanc, 2010).…”

Section: Introductionmentioning

confidence: 99%

Partitioning the components of visuomotor adaptation to prism-altered distance

Priot

Laboissière

Plantier³

et al. 2011

Neuropsychologia

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While the mechanisms of short-term adaptation to prism-altered apparent visual direction have been widely investigated, the processes underlying adaptation to prism-altered perceived distance are less well known. This study used a hand-pointing paradigm and exposure with base-out prisms to evaluate the relative contributions of sensory (visual and proprioceptive) and motor components of adaptation to perceived-distance alteration. A main experiment was designed to elicit adaptation at the sensory and motor levels, by giving subjects altered visual feedback. A control experiment without visual feedback allowed the effects of eye muscle potentiation (EMP) induced by sustained fixation through the prisms to be uncovered. In the main experiment, the aftereffects were partitioned into two-thirds visual and one-third motor, with no significant proprioceptive component. These results differ from the classical pattern of short-term adaptation to prism-altered apparent visual direction, which includes mainly proprioceptive/motor adaptive components, with a smaller visual component. This difference can be attributed to differences in accuracy between proprioception and vision for localization in depth or in lateral directions. In addition, a comparison of the visual aftereffects in the main and control experiments revealed two sub-components with equal contributions: a recalibration of the mapping between the vergence signal and perceived distance, and an EMP-related aftereffect. These findings indicate that "visual" adaptation actually involves a multiplicity of processes.

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Section: Introductionmentioning

confidence: 99%

Partitioning the components of visuomotor adaptation to prism-altered distance

Priot

Laboissière

Plantier³

et al. 2011

Neuropsychologia

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“…Thus, the efficacy of vertical disparities could be reduced at far viewing distances. This range of distances is likely to be extended in camera configurations with increased inter-axial separation, resulting in hyper-stereo viewing (Newman & Ostler, 2009; Priot, Laboissiere, Sillan, Roumes, & Prablanc, 2010; Rogers, 2011). …”

Section: Discussionmentioning

confidence: 99%

The Role of Vertical Disparity in Distance and Depth Perception as Revealed by Different Stereo-Camera Configurations

Vienne¹,

Plantier²,

Neveu³

et al. 2016

i-Perception

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Vertical binocular disparity is a source of distance information allowing the portrayal of the layout and 3D metrics of the visual space. The role of vertical disparity in the perception of depth, size, curvature, or slant of surfaces was revealed in several previous studies using cue conflict paradigms. In this study, we varied the configuration of stereo-cameras to investigate how changes in the horizontal and vertical disparity fields, conflicting with the vergence cue, affect perceived distance and depth. In four experiments, observers judged the distance of a cylinder displayed in front of a large fronto-parallel surface. Experiment 1 revealed that the presence of a background surface decreases the uncertainty in judgments of distance, suggesting that observers use the relative horizontal disparity between the target and the background as a cue to distance. Two other experiments showed that manipulating the pattern of vertical disparity affected both distance and depth perception. When vertical disparity specified a nearer distance than vergence (convergent cameras), perceived distance and depth were underestimated as compared with the condition where vertical disparity was congruent with vergence cues (parallel cameras). When vertical disparity specified a further distance than vergence, namely an infinite distance, distance and depth were overestimated. The removal of the vertical distortion lessened the effect on perceived distance. Overall, the results suggest that the vertical disparity introduced by the specific camera configuration is mainly responsible for the effect. These findings outline the role of vertical disparity in distance and depth perception and support the use of parallel cameras for designing stereograms.

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“…The functional relationship between actual and estimated target distances was analyzed using a linear model (Ebenholtz 1981;Mon-Williams and Tresilian 1999;Priot et al 2010Priot et al , 2011. For each subject and each condition, the relationship between the pointing distance (dependent variable) and the actual (physical) target distance (independent variable) was fitted with a line, using a leastsquares criterion.…”

Section: Discussionmentioning

confidence: 99%

“…Changes in distance perception attributed to EMP have been reported after near (Ebenholtz and Wolfson 1975;Ebenholtz 1981) or far viewing (Ebenholtz and Wolfson 1975), after fixation through base-out (Owens and Leibowitz 1980;Ebenholtz 1981) or base-in prisms (Paap and Ebenholtz 1977), a telestereoscope (Fisher and Ciuffreda 1990;Priot et al 2010), or positive spherical lenses (Ebenholtz and Fisher 1982), all of which modify the fusional vergence demand. The sign (positive or negative) of the observed change in perceived distance was predicted by the sign of the change in fusional vergence demand.…”

Section: Introductionmentioning

confidence: 98%

How perceived egocentric distance varies with changes in tonic vergence

Priot

Neveu²,

Sillan

et al. 2012

Exp Brain Res

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According to the eye muscle potentiation (EMP) hypothesis, sustained vergence leads to changes in egocentric perceived distance. This perceptual effect has been attributed to a change in the resting or tonic state of vergence. The goal of the present study was to test the EMP hypothesis by quantifying the relationship between prism-induced changes in tonic vergence and corresponding changes in perceived distance and by measuring the dynamics of changes in perceived distance. During a 10-min exposure to 5-diopter base-out prisms that increased the vergence demand, thirteen right-handed subjects pointed to visual targets located within reaching space using their left hand, without visual feedback. Pre- and post-exposure tests assessed tonic vergence through phoria measurements and egocentric distance estimate through pointing to visual targets with each hand successively, without visual feedback. Similar distance aftereffects were observed for both hands, although only the left hand was used during exposure, indicating that these aftereffects are mediated by visual processes rather than by visuomotor interactions. The distance aftereffects were significantly correlated with prism-induced changes in phoria, demonstrating a relationship between perceived distance and the level of tonic vergence. Changes in perceived distance increased monotonically across trials during prism exposure and remained stable during the post-test, indicating a long time constant for these perceptual effects, consistent with current models of the vergence control system. Overall, these results support the hypothesis that vergence plays a role in reduced-cue distance perception. They further illustrate that variations in tonic vergence influence perceived distance by altering the sensed vergence effort.

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Adaptation of egocentric distance perception under telestereoscopic viewing within reaching space

Cited by 16 publications

References 56 publications

Partitioning the components of visuomotor adaptation to prism-altered distance

Partitioning the components of visuomotor adaptation to prism-altered distance

The Role of Vertical Disparity in Distance and Depth Perception as Revealed by Different Stereo-Camera Configurations

How perceived egocentric distance varies with changes in tonic vergence

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