Cited by 17Neuroscience and Neural EngineeringTactile and Sensory InteractionsVisual perception and processing mechanisms

Full gaze contingency provides better reading performance than head steering alone in a simulation of prosthetic vision

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Paraskevoudi, Nadia, Pezaris, John S.·2021·Scientific Reports

Abstract

The visual pathway is retinotopically organized and sensitive to gaze position, leading us to hypothesize that subjects using visual prostheses incorporating eye position would perform better on perceptual tasks than with devices that are merely head-steered. We had sighted subjects read sentences from the MNREAD corpus through a simulation of artificial vision under conditions of full gaze compensation, and head-steered viewing. With 2000 simulated phosphenes, subjects (n = 23) were immediately able to read under full gaze compensation and were assessed at an equivalent visual acuity of 1.0 logMAR, but were nearly unable to perform the task under head-steered viewing. At the largest font size tested, 1.4 logMAR, subjects read at 59 WPM (50% of normal speed) with 100% accuracy under the full-gaze condition, but at 0.7 WPM (under 1% of normal) with below 15% accuracy under head-steering. We conclude that gaze-compensated prostheses are likely to produce considerably better patient outcomes than those not incorporating eye movements.

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  • Some previous studies have used a model of cortical magnification or visuotopic mapping in their phosphene simulations.

    “Some previous studies have used a model of cortical magnification (Srivastava et al., 2009; Paraskevoudi and Pezaris, 2021) or visuotopic mapping (Wong et al., 2010; Li, 2013) in their phosphene simulations.”

    From Towards biologically plausible phosphene simulation for the differentiable optimization of visual cortical prostheses (2024) · cites this paper as Paraskevoudi and Pezaris, 2021

    The Discussion (‘Phosphene pattern, field extent, and theoretical acuity’; page not provided) says the simulated pattern incorporates tissue-magnification effects, which it notes occur in both the LGN and visual cortex. But Materials and methods (‘Phosphene pattern’; page not provided) specifies that this simulation models electrodes in the LGN, not a cortical-magnification model specifically. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Preliminary evidence suggests that gaze-contingent image processing can improve the functional and subjective quality of prosthetic vision.

    “While further research is required, there is some preliminary evidence that such a gaze-contingent image processing can improve the functional and subjective quality of prosthetic vision (Caspi et al., 2018; Paraskevoudi and Pezaris, 2021; Rassia and Pezaris, 2018; Titchener et al., 2018).”

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Authors
Paraskevoudi, N., & Pezaris, J. S.
Affiliations
  • Universitat de Barcelona (ES)
  • Harvard University (US)
Corresponding author
Pezaris, John S.
Venue
Scientific Reports
Published
2021-05-27
Volume
11
Issue
1
Pages
11121-11121
ISSN
2045-2322 (ISSN-L)
OpenAlex
W3164810191
Cited by
16
References
74
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 7 · 2022: 1
FWCI
1.27
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
William M. Wood Foundation
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords
retinal prosthesis, reading achievement, eye movements, visual acuity, MNREAD, low vision rehabilitation
MeSH terms
Adolescent, Adult, Female, Fixation, Ocular, Humans, Male, Reading, Vision, Ocular, Vision Tests, Visual Acuity, Visual Pathways, Young Adult, Visual Prosthesis

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