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Angelica Godinez, Alyson Kishi, Mariela Hernandez, Preeti Verghese, Dennis Levi; Stereoacuity predicts total movement time in a fronto-parallel prehension task. Journal of Vision 2018;18(10):60. doi: 10.1167/18.10.60.
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Spatial and binocular vision play an important role in visuomotor control and execution (Melmoth & Grant, 2006). However, people who are stereo-blind or -anomalous exhibit deficits in spatial vision, which consequently impacts the way they interact with objects in the environment (Grant, Melmoth, Morgan, & Finlay, 2007). Although the role of binocular vision on hand-eye coordination has been a topic of research interest (Melmoth & Grant, 2006; Grant et al., 2007; Melmoth et al., 2009), and observational results suggest that the total movement time increases with the amount of disparity sensitivity loss (Melmoth et al., 2009), the direct relationship between stereopsis and prehension in a stereo-anomalous population has not been quantified. Thus, the aim of this study was to quantify the relationship between stereoacuity and motor movement using a prehension task with a fronto-parallel view (Verghese, Tyson, Ghahghaei, & Fletcher, 2016) to most accurately test the influence of binocular vision. We tested 15 observers with varying binocular alignment (7 normal, 2 anisometropic, 2 strabismic, 4 mixed) and stereoacuity (31 to >1500 arc secs) on a peg-placement prehension task. Each observer completed a total of 16 trials for each viewing condition (DE, NDE, and binocular). Stereoacuity measures were taken from the Asteroid software, which is a 4-AFC Dynamic Random Dot stimulus with a Bayesian staircase, presented on the FlightDeck tablet. 3D tracking of the wrist, thumb and grasping finger was captured at 240 Hz with the Polhemus Liberty 240/16 motion tracker. Our preliminary results indicate that stereoacuity is positively correlated with the total movement time on the task (r = 0.46, p < 0.05). Consistent with previous studies, our results show that there is an advantage of binocular viewing compared to dominant eye viewing. We conclude that stereoacuity is an important factor in everyday hand-eye coordination
Meeting abstract presented at VSS 2018
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