https://scx1.b-cdn.net/csz/news/tmb/2023/a-better-map-of-the-li.jpg” data-src=”https://scx2.b-cdn.net/gfx/news/hires/2023/a-better-map-of-the-li.jpg” data-sub-html=”The simulation paradigm The simulation paradigm. (a) Retinotopic data of one subject from the Human Connectome Project. On the left are the lateral view and posterior view of the brain. On the right are the population receptive fields of V1 and V2 grayordinates. Each white dot on the brain and visual field represents the grayordinate and corresponding population receptive field. (b) Surgical planning by placing implants on the MRI scan of the subject’s visual cortex. On the top left is the Monash Vision Group Gennaris implant, and on the bottom left is the layout of electrodes. On the right is the placement of implants on V1 and V2. (c) Derived phosphene map using the dataset (top right). The image shows the rendered images after adjusting the phosphene size. (d) Image presentation. On the left is the control condition, in the middle is a naïve method (retinotopic condition) where the visual stimulus is placed at the center of the phosphene map. On the right is a clustering method (retinotopic + clustering condition) where the visual stimulus is placed at a region where the phosphenes are denser. Credit: Journal of Neural Engineering ( 2023 ). DOI: 10.1088/1741-2552/aceca2″> < div data-thumb ="https://scx1.b-cdn.net/csz/news/tmb/2023/a-better-map-of-the-li.jpg"data-src ="https://scx2.b-cdn.net/gfx/news/hires/2023/a-better-map-of-the-li.jpg"data-sub-html ="The simulation paradigm The simulation paradigm.(a )Retinotopic information of one topic from the Human Connectome Project. Left wing are the lateral view and posterior view of the brain. On the right are the population responsive fields of V1 and V2 grayordinates. Each white dot on the brain and visual field represents the grayordinate and corresponding population responsive field.(b) Surgical preparation by positioning implants on the MRI scan of the topic's visual cortex. On the leading left is the Monash Vision Group Gennaris implant, and on the bottom left is the design of electrodes. On the right is the positioning of implants on V1 and V2.(c)Derived phosphene map utilizing the dataset (leading right). The image reveals the rendered images after changing the phosphene size.(d)Image discussion. Left wing is the control condition, in the middle is a naïve approach (retinotopic condition)where the visual stimulus is positioned at the center of the phosphene map. On the right is a clustering technique(retinotopic +clustering condition)where the visual stimulus is put at an area where the phosphenes are denser. Credit: Journal of Neural Engineering(2023). DOI: 10.1088/ 1741-2552/ aceca2″>
The simulation paradigm The simulation paradigm. (a)Retinotopic information of one topic from the Human Connectome Project. Left wing are the lateral view and posterior view of the brain. On the right are the population responsive fields of V1 and V2 grayordinates. Each white dot on the brain and visual field represents the grayordinate and corresponding population responsive field.(b)Surgical preparation by positioning implants on the MRI scan of the topic’s visual cortex. On the leading left is the Monash Vision Group Gennaris implant, and on the bottom left is the design of electrodes. On the right is the positioning of implants on V1 and V2. (c) Derived phosphene map utilizing the dataset (leading right). The image reveals the rendered images after changing the phosphene size. (d) Image discussion. Left wing is the control condition, in the middle is a naïve technique (retinotopic condition) where the visual stimulus is positioned at the center of the phosphene map. On the right is a clustering technique (retinotopic + clustering condition) where the visual stimulus is positioned at an area where the phosphenes are denser. Credit: Journal of Neural Engineering (2023). DOI: 10.1088/ 1741-2552/ aceca2
Scientists at Monash University have actually recognized a brand-new method of mapping’phosphenes’– the visual understanding of the intense flashes we see when no light is getting in the eye– to enhance the result of surgical treatment for clients getting a cortical visual prosthesis (‘bionic eye’).
Cortical visual prostheses are gadgets implanted onto the brain with the goal of bring back sight by straight promoting the location accountable for vision, the visual cortex, bypassing damage to the retina of the eye or the optic nerve.
A common prosthesis includes a selection of great electrodes, each of which is developed to set off a phosphene. Offered the restricted variety of electrodes, comprehending how electrodes can best be positioned to produce beneficial viewed images ends up being crucial.
As part of this scientists from the Department of Electrical and Computer Systems Engineering at Monash University, led by Associate Professor Yan Tat Wong, are focusing on the perfect circulation of phosphenes.
“Phosphenes are most likely to be dispersed unevenly in a person’s visual field, and distinctions in the surface area of the brain likewise impact how cosmetic surgeons position implants, which together lead to a phosphene map distinct to each client,” Associate Professor Wong stated.
Released in theJournal of Neural Engineering“An unique simulation paradigm using MRI-derived phosphene maps for cortical prosthetic vision” p