Binocular retinal image differences influence eye-position signals for perceived visual direction

Sridhar, Deepika; Bedell, Harold E.

doi:10.1016/j.visres.2012.04.011

Cited by 3 publications

(4 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The likelihood of a saccade is higher for vergence eye movements that have greater amplitudes and velocities (Semmlow et al 1986;Wick and Bedell 1992). Previously, we tested whether the velocity of asymmetric vergence affects the weighting of eye-position information for perceived EVD, and found no systematic variation in pointing responses when the velocity of the vergence demand varied from 0.75 deg s -1 per eye to a step change (Sridhar and Bedell 2012). This result suggests that the presence or absence of unequal saccades during symmetric vergence in the current experiment should not have exerted a substantial influence on the measurements of perceived EVD.…”

Section: Subjectsupporting

confidence: 56%

“…Lehky (2011) attempted to account for the "image rivalry" that can occur between complex binocular images in higher cortical areas by demonstrating that neuron-to-neuron variations in the degree of ocular dominance permit an "unmixing" of binocular images into their separate monocular components. We showed that a change in the relative visibility of the images presented to the two eyes is accompanied by a change in the relative weighting of eye-position information (Sridhar and Bedell 2012).…”

Section: Subjectmentioning

confidence: 86%

See 1 more Smart Citation

Changes in Perceived Egocentric Direction during Symmetric Vergence

Sridhar

Bedell

2013

Perception

Self Cite

View full text Add to dashboard Cite

The Wells-Hering's laws of perceived egocentric visual direction (EVD) assume that information about eye position includes equal contributions from both eyes. An implication of this assumption is that only versional eye movements should lead to a change in perceived EVD. Previously, we showed that a differential weighting of eye-position information occurs in some individuals during asymmetric vergence. To extend this finding, we determined here whether a differential weighting of eye-position information occurs also during symmetric vergence eye movements. Open-loop pointing responses to a bright target were obtained in five subjects to estimate the contribution of each eye's position information to perceived EVD during symmetric vergence demands that ranged from 6 prism diopters base in to 18 prism diopters base out. In all five subjects, the slopes of the lines fit to the pointing responses were in the direction that was predicted from an unequal weighting of eye-position information. We conclude that symmetric vergence movements can result in a change in perceived visual direction, contrary to an assumption of the Wells-Hering's laws.

show abstract

Section: Subjectsupporting

confidence: 56%

Section: Subjectmentioning

confidence: 86%

Changes in Perceived Egocentric Direction during Symmetric Vergence

Sridhar

Bedell

2013

Perception

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is well-known that the eye position strongly affects the perception of visual egocentric information (Barbeito and Simpson, 1991 ; Sridhar and Bedell, 2011 , 2012 ). However, most previous studies did not monitor the eye position during experiments, thus the effect of eye position on visual egocentric judgment was ignored.…”

Section: Discussionmentioning

confidence: 99%

Leftward Deviation and Asymmetric Speed of Egocentric Judgment between Left and Right Visual Fields

Zhou

Wang

et al. 2017

Front. Neurosci.

View full text Add to dashboard Cite

The egocentric reference frame is essential for body orientation and spatial localization of external objects. Recent neuroimaging and lesion studies have revealed that the right hemisphere of humans may play a more dominant role in processing egocentric information than the left hemisphere. However, previous studies of egocentric discrimination mainly focused on assessing the accuracy of egocentric judgment, leaving its timing unexplored. In addition, most previous studies never monitored the subjects' eye position during the experiments, so the influence of eye position on egocentric judgment could not be excluded. In the present study, we systematically assessed the processing of egocentric information in healthy human subjects by measuring the location of their visual subjective straight ahead (SSA) and their manual reaction time (RT) during fixation (monitored by eye tracker). In an egocentric discrimination task, subjects were required to judge the position of a visual cue relative to the subjective mid-sagittal plane and respond as quickly as possible. We found that the SSA of all subjects deviated to the left side of the body mid-sagittal plane. In addition, all subjects but one showed the longest RT at the location closest to the SSA; and in population, the RTs in the left visual field (VF) were longer than that in the right VF. These results might be due to the right hemisphere's dominant role in processing egocentric information, and its more prominent representation of the ipsilateral VF than that of the left hemisphere.

show abstract

“…Historically, the visual direction of a binocular stimulus was known to be determined by three variables—retinal loci of the stimulus, binocular eye position, and the location of the visual egocenter (e.g., [1,2,3])—and there is ample evidence supporting this idea (see [4,5,6]). Differences in stimulus properties between the two eyes are also known to be variables that affect the visual direction of a binocular stimulus, such as blur [7], luminance [7,8,9,10], contrast [9,11,12], and binocular disparity [13]. In the present study, we show that the slant of a surface, either in front of or behind a binocular stimulus is a variable that affects binocular visual direction.…”

Section: Introductionmentioning

confidence: 99%

Slant of a Surface Shifts Binocular Visual Direction

Kusano

Shimono

2018

Vision

View full text Add to dashboard Cite

We demonstrate how the slant of a surface affects the relative visual direction between binocular stimuli. In two experiments, we measured the visual direction of a binocular stimulus at different distances in the mid-sagittal plane or in the transverse plane at eye level relative to the center of the stimulus field. Experiment 1 showed that when a binocular stimulus (a vertical bar) was presented in front of or behind a surface slanted along the vertical center of the surface, its visual direction shifted toward the surface. Experiment 2 showed that when a binocular stimulus (a horizontal bar) was presented in front of or behind a surface slanted along the horizontal center of the surface, its visual direction also shifted toward the surface. These results indicate that the slant of a surface should be listed among the variables that contribute to the binocular visual direction, as well as the retinal loci of the stimulus, binocular eye position, the location of the visual egocenter, and stimulus properties.

show abstract

Binocular retinal image differences influence eye-position signals for perceived visual direction

Cited by 3 publications

References 61 publications

Changes in Perceived Egocentric Direction during Symmetric Vergence

Changes in Perceived Egocentric Direction during Symmetric Vergence

Leftward Deviation and Asymmetric Speed of Egocentric Judgment between Left and Right Visual Fields

Slant of a Surface Shifts Binocular Visual Direction

Contact Info

Product

Resources

About