Mobility performance with a pixelized vision system.
Abstract
A visual prosthesis, based on electrical stimulation of the visual cortex, has been suggested as a means for partially restoring functional vision in the blind. The prosthesis would create a pixelized visual sense consisting of punctate spots of light (phosphenes). The present study investigated the feasibility of achieving visually-guided mobility with such a visual sense. Psychophysical experiments were conducted on normally sighted human subjects, who were required to walk through a maze which included a series of obstacles, while their visual input was restricted to information from a pixelized vision simulator. Walking speed and number of body contacts with obstacles and walls were measured as a function of pixel number, pixel spacing, object minification, and field of view. The results indicate that a 25 x 25 array of pixels distributed within the foveal visual area could provide useful visually guided mobility in environments not requiring a high degree of pattern recognition.
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It has been estimated that we need at least 625 electrodes implanted in visual areas for reading (although at lower speeds) and navigating through complex visual environments.
“It has been estimated that we need at least 625 electrodes implanted in visual areas for reading (although at lower speeds) and navigating through complex visual environments (Cha et al., 1992).”
From Toward a personalized closed-loop stimulation of the visual cortex: Advances and challenges (2022) · cites this paper as Cha et al., 1992
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- Authors
- Cha, K., Horch, K. W., & Normann, R. A.
- Affiliations
- University of Utah (US)
- Corresponding author
- Horch, Kenneth W.
- Venue
- Vision Research
- Publisher
- Elsevier BV
- Published
- 1992-07
- Volume
- 32
- Issue
- 7
- Pages
- 1367-1372
- ISSN
- 0042-6989 (ISSN-L)
- OpenAlex
- W2026137948
- Cited by
- 226
- References
- 34
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 5 · 2023: 6 · 2022: 11 · 2021: 4 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 10 · 2016: 6 · 2015: 11 · 2014: 16 · 2013: 13 · 2012: 11
- FWCI
- 0.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Vision Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Keywords
- visual prosthesis, phosphenes, blind rehabilitation, field of view, pixel spacing, maze navigation, walking speed, obstacle avoidance
- MeSH terms
- Blindness, Electric Stimulation, Humans, Locomotion, Phosphenes, Vision, Ocular, Visual Cortex, Prostheses and Implants
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