"Visual Prostheses"
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State-of-the-Art Review Section Editors: Grant T. Liu, MD Randy H. Kardon, MD, PhD Update on Retinal Prosthetic Research: The Boston Retinal Implant Project Joseph F. Rizzo III, MD Abstract: The field of retinal prosthetic research, now more pathway in the retina, optic nerve, lateral geniculate body, than 20 years old, has produced many high-quality technical and the primary or higher visual cortical regions. Each options that have the potential to restore vision to patients approach has advantages and disadvantages. There is no with acquired disease of the outer retina. Five companies have performed Phase I clinical trials demonstrating that clear benefit to one approach or the other. blind patients can reliably report basic elements of visual The first attempt to build a visual prosthesis dates back to percepts induced by electrical stimulation. However, at the 1970s (1). In the late 1980s, 2 research groups, one present patients and observers generally do not consider based at the Massachusetts Eye and Ear Infirmary/Harvard the results to be useful enough in the performance of tasks Medical School and the Massachusetts Institute of Tech- of daily living to justify the risks of surgery and chronic implantation or the costs. Having developed a wireless nology and the other at the North Carolina State University device implanted in the subretinal space, the Boston Ret- and the Duke University, simultaneously began to in- inal Implant Project has focused its efforts on developing vestigate the development of a retinal prosthesis. The former scalable technologies to create a hermetic device that can consortium now includes the Boston Veterans Adminis- deliver individually controlled pulses of electrical stimula- tration Hospital as an integral partner. -
Subliminal Afterimages Via Ocular Delayed Luminescence: Transsaccade Stability of the Visual Perception and Color Illusion
ACTIVITAS NERVOSA SUPERIOR Activitas Nervosa Superior 2012, 54, No. 1-2 REVIEW ARTICLE SUBLIMINAL AFTERIMAGES VIA OCULAR DELAYED LUMINESCENCE: TRANSSACCADE STABILITY OF THE VISUAL PERCEPTION AND COLOR ILLUSION István Bókkon1,2 & Ram L.P. Vimal2 1Doctoral School of Pharmaceutical and Pharmacological Sciences, Semmelweis University, Budapest, Hungary 2Vision Research Institute, Lowell, MA, USA Abstract Here, we suggest the existence and possible roles of evanescent nonconscious afterimages in visual saccades and color illusions during normal vision. These suggested functions of subliminal afterimages are based on our previous papers (i) (Bókkon, Vimal et al. 2011, J. Photochem. Photobiol. B) related to visible light induced ocular delayed bioluminescence as a possible origin of negative afterimage and (ii) Wang, Bókkon et al. (Brain Res. 2011)’s experiments that proved the existence of spontaneous and visible light induced delayed ultraweak photon emission from in vitro freshly isolated rat’s whole eye, lens, vitreous humor and retina. We also argue about the existence of rich detailed, subliminal visual short-term memory across saccades in early retinotopic areas. We conclude that if we want to understand the complex visual processes, mere electrical processes are hardly enough for explanations; for that we have to consider the natural photobiophysical processes as elaborated in this article. Key words: Saccades Nonconscious afterimages Ocular delayed bioluminescence Color illusion 1. INTRODUCTION Previously, we presented a common photobiophysical basis for various visual related phenomena such as discrete retinal noise, retinal phosphenes, as well as negative afterimages. These new concepts have been supported by experiments (Wang, Bókkon et al., 2011). They performed the first experimental proof of spontaneous ultraweak biophoton emission and visible light induced delayed ultraweak photon emission from in vitro freshly isolated rat’s whole eye, lens, vitreous humor, and retina. -
Retinal Prostheses: Progress Toward the Next Generation Implants
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Frontiers - Publisher Connector MINI REVIEW published: 20 August 2015 doi: 10.3389/fnins.2015.00290 Retinal prostheses: progress toward the next generation implants Diego Ghezzi* Medtronic Chair in Neuroengineering, Center for Neuroprosthetics, Interfaculty Institute of Bioengineering, School of Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland In the last decade, various clinical trials proved the capability of visual prostheses, in particular retinal implants, to restore a useful form of vision. These encouraging results promoted the emerging of several strategies for neuronal stimulation aiming at the restoration of sight. Besides the traditional approach based on electrical stimulation through metal electrodes in the different areas of the visual path (e.g., the visual cortex, the lateral geniculate nucleus, the optic nerve, and the retina), novel concepts for neuronal stimulation have been mostly exploited as building blocks of the next generation of retinal implants. This review is focused on critically discussing recent major advancements in Edited by: the field of retinal stimulation with particular attention to the findings in the application Michele Giugliano, of novel concepts and materials. Last, the major challenges in the field and their clinical University of Antwerp, Belgium implications will be outlined. Reviewed by: Guillermo Peris Fajarnes, Keywords: vision, retinal prosthesis, photovoltaic stimulation, thermal stimulation, ultrasonic stimulation University of Valencia, Spain Karl Farrow, Neuro-Electronics Research Flanders, Introduction Belgium *Correspondence: Low vision and blindness can result when any step of the visual pathway (the cornea, the lens, Diego Ghezzi, the retina, the optic nerve, the thalamus, and the visual cortex) is altered or sustains damage. -
Visual Perception in Migraine: a Narrative Review
vision Review Visual Perception in Migraine: A Narrative Review Nouchine Hadjikhani 1,2,* and Maurice Vincent 3 1 Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA 2 Gillberg Neuropsychiatry Centre, Sahlgrenska Academy, University of Gothenburg, 41119 Gothenburg, Sweden 3 Eli Lilly and Company, Indianapolis, IN 46285, USA; [email protected] * Correspondence: [email protected]; Tel.: +1-617-724-5625 Abstract: Migraine, the most frequent neurological ailment, affects visual processing during and between attacks. Most visual disturbances associated with migraine can be explained by increased neural hyperexcitability, as suggested by clinical, physiological and neuroimaging evidence. Here, we review how simple (e.g., patterns, color) visual functions can be affected in patients with migraine, describe the different complex manifestations of the so-called Alice in Wonderland Syndrome, and discuss how visual stimuli can trigger migraine attacks. We also reinforce the importance of a thorough, proactive examination of visual function in people with migraine. Keywords: migraine aura; vision; Alice in Wonderland Syndrome 1. Introduction Vision consumes a substantial portion of brain processing in humans. Migraine, the most frequent neurological ailment, affects vision more than any other cerebral function, both during and between attacks. Visual experiences in patients with migraine vary vastly in nature, extent and intensity, suggesting that migraine affects the central nervous system (CNS) anatomically and functionally in many different ways, thereby disrupting Citation: Hadjikhani, N.; Vincent, M. several components of visual processing. Migraine visual symptoms are simple (positive or Visual Perception in Migraine: A Narrative Review. Vision 2021, 5, 20. negative), or complex, which involve larger and more elaborate vision disturbances, such https://doi.org/10.3390/vision5020020 as the perception of fortification spectra and other illusions [1]. -
Phosphene Perception Is Due to the Ultra-Weak Photon Emission Produced in Various Parts of the Visual System: Glutamate in the Focus
Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2016 Phosphene perception is due to the ultra-weak photon emission produced in various parts of the visual system: glutamate in the focus Császár, Noémi ; Scholkmann, Felix ; Salari, Vahid ; Szőke, Henrik ; Bókkon, István Abstract: Phosphenes are experienced sensations of light, when there is no light causing them. The physiological processes underlying this phenomenon are still not well understood. Previously, we proposed a novel biopsychophysical approach concerning the cause of phosphenes based on the assumption that cellular endogenous ultra-weak photon emission (UPE) is the biophysical cause leading to the sensation of phosphenes. Briefly summarized, the visual sensation of light (phosphenes) is likely to be duetothe inherent perception of UPE of cells in the visual system. If the intensity of spontaneous or induced photon emission of cells in the visual system exceeds a distinct threshold, it is hypothesized that it can become a conscious light sensation. Discussing several new and previous experiments, we point out that the UPE theory of phosphenes should be really considered as a scientifically appropriate and provable mechanism to explain the physiological basis of phosphenes. In the present paper, we also present our idea that some experiments may support that the cortical phosphene lights are due to the glutamate-related excess UPE in the occipital cortex. DOI: https://doi.org/10.1515/revneuro-2015-0039 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-126012 Journal Article Published Version Originally published at: Császár, Noémi; Scholkmann, Felix; Salari, Vahid; Szőke, Henrik; Bókkon, István (2016). -
Cochlear Implant for the Deaf
Introduction to Neural Prosthesis Sung June Kim Neural Prosthetic Engineering 1 Neural Prosthesis • A device that connects directly with the nervous system to replace or supplement sensory or motor function. • A device that improves the quality of life of a neurologically impaired individual so much that he/she is willing to put up with the surgery, gadgetry, etc. Neural Prosthetic Engineering 2 Successful Areas of Neural Prosthesis • (Bionic Ear) • Hearing: Cochlear Implant • Vision: Retinal Implant • Parkinson’s Disease: DBS (Deep Brain Stimulation) Neural Prosthetic Engineering 3 Why these three? • Success in Cochlear Implant • The other two were inspired by its (the CI’s) success. • The Cochlear and Retinal implants are sensory prosthetics, using electrical stimulation of neurons. • The DBS deals with motion disability yet uses CI like neuronal stimulation. Neural Prosthetic Engineering 4 Why was CI so successful? • Spatially isolated space was available for the electrode array. The electrode array was still electrically connected to the target neurons. • Timely development of the transistor based microelectronics technologies that made the electronics small (wearable, implantable) but powerful. http://www.cochlearamericas.com/ Neural Prosthetic Engineering 5 What are needed in NP? (1) • External unit is needed if there is a signal to process. • Speech is the signal to process in Cochlear Implant • Image is the signal to process in Retinal Implant • There is no external signal to process in DBS. External Unit Neural Prosthetic Engineering 6 Speech Processor, An example of External Unit 7 www. bionicear.com, www.medel.com, www.cochlear.com Neural Prosthetic Engineering What are needed in NP? (2) • Internal Unit (Implantable Unit) • This unit generates electrical signals, and apply them to the array of electrodes that stimulate target neurons. -
THE 11TH WORLD CONGRESS on the Relationship Between Neurobiology and Nano-Electronics Focusing on Artificial Vision
THE 11TH WORLD CONGRESS On the Relationship Between Neurobiology and Nano-Electronics Focusing on Artificial Vision November 10-12, 2019 The Henry, An Autograph Collection Hotel DEPARTMENT OF OPHTHALMOLOGY Detroit Institute of Ophthalmology Thank you to Friends of Vision for your support of the Bartimaeus Dinner The Eye and The Chip 2 DEPARTMENT OF OPHTHALMOLOGY Detroit Institute of Ophthalmology TABLE OF CONTENTS WELCOME LETTER—PAUL A. EDWARDS. M.D. ....................................................... WELCOME LETTER—PHILIP C. HESSBURG, M.D. ..................................................... DETROIT INSTITUTE OF OPHTHALMOLOGY ......................................................... ORGANIZING COMMITTEE/ACCREDITATION STATEMENT ............................................... CONGRESS 3-DAY SCHEDULE ................................................................... PLATFORM SPEAKER LIST ...................................................................... SPEAKER ABSTRACTS .......................................................................... POSTER PRESENTERS’ LIST ..................................................................... POSTER ABSTRACTS ........................................................................... BARTIMAEUS AWARD—PREVIOUS RECIPIENTS ...................................................... SUPPORTING SPONSORS . Audio-Visual Services Provided by Dynasty Media Network http://dynastymedianetwork.com/ The Eye and The Chip Welcome On behalf of the Henry Ford Health System and the Department of Ophthalmology, -
Intracortical Microstimulation Modulates Cortical Induced Responses
7774 • The Journal of Neuroscience, September 5, 2018 • 38(36):7774–7786 Systems/Circuits Intracortical Microstimulation Modulates Cortical Induced Responses Mathias Benjamin Voigt,1,2 XPrasandhya Astagiri Yusuf,1,2,3 and XAndrej Kral1,2 1Institute of AudioNeuroTechnology and Department of Experimental Otology, Hannover Medical School, 30625 Hannover, Germany, 2Cluster of Excellence “Hearing4all”, 30625 Hannover, Germany, and 3Department of Medical Physics/Medical Technology Cluster IMERI, Faculty of Medicine Universitas Indonesia, 10430 Jakarta, Indonesia Recentadvancesincorticalprostheticsreliedonintracorticalmicrostimulation(ICMS)toactivatethecorticalneuralnetworkandconvey information to the brain. Here we show that activity elicited by low-current ICMS modulates induced cortical responses to a sensory stimulus in the primary auditory cortex (A1). A1 processes sensory stimuli in a stereotyped manner, encompassing two types of activity: evoked activity (phase-locked to the stimulus) and induced activity (non-phase-locked to the stimulus). Time-frequency analyses of extracellular potentials recorded from all layers and the surface of the auditory cortex of anesthetized guinea pigs of both sexes showed that ICMS during the processing of a transient acoustic stimulus differentially affected the evoked and induced response. Specifically, ICMS enhanced the long-latency-induced component, mimicking physiological gain increasing top-down feedback processes. Further- more, the phase of the local field potential at the time of stimulation was -
Challenges in the Design of Large-Scale, High-Density, Wireless Stimulation and Recording Interface
Challenges in the Design of Large-Scale, High-Density, Wireless Stimulation and Recording Interface Po-Min Wang, Stanislav Culaclii, Kyung Jin Seo, Yushan Wang, Hui Fang, Yi-Kai Lo, and Wentai Liu 1 Introduction Neural stimulation and recording have been widely applied to fundamental research to better understand the nervous systems as well as to the clinical therapy of a variety of diseases. Well-known examples include monitoring and manipulating neural activities in the brain to map the brain function [1–3], spinal cord implant to restore the motor function after spinal cord injury [4–6], gastrointestinal (GI) implant to monitor and treat GI motility disorders [7–9], and retinal prostheses to regain eyesight in the blind [10–12]. These applications require continuous techno- logical advancement in designs of stimulation and recording electronics, electrodes, and the interconnections between the electronics and the electrodes. Despite technological advances to date, there are still challenges to overcome in applications requiring large-scale, high-density, wireless stimulation and recording. Concretely, the study of the brain function through monitoring and manipulating neural activities in freely moving and behaving subjects requires decoding the com- plex brain dynamics by mapping brain activity with both large-scale and high spa- tial resolution. This decoding demands a large-scale, high-density electrode array with small electrode size, which imposes significant challenges in electrode array fabrication as well as its interconnect with electronics. In addition, the capability to record high channel number implies the need for wireless electronics with high P.-M. Wang · S. Culaclii · Y. Wang · W. Liu (*) Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA e-mail: [email protected] K. -
Upper Extremity Rehabilitation
Stroke Rehabilitation Clinician Handbook 2020 4. Hemiplegic Upper Extremity Rehabilitation Robert Teasell MD, Norhayati Hussein MD, Magdalena Mirkowski MSc, MScOT, Danielle Vanderlaan RRT, Marcus Saikaley HBSc, Mitchell Longval BSc, Jerome Iruthayarajah MSc Table of Contents 4.3.16 Repetitive Transcranial Magnetic 4.1 Recovery for Upper Extremity ............ 2 Stimulation (rTMS) ....................................... 33 4.1.1 Brunnstrom Stages of Motor Recovery 2 4.3.17 Transcranial Direct Current Stimulation 4.1.2 Typical Recovery and Predictors ........... 2 (tDCS) ........................................................... 35 4.1.3 Recovery of Upper Extremity: Fixed 4.3.18 Telerehabilitation ............................. 36 Proportion ...................................................... 3 4.3.19 Orthosis in Hemiparetic Upper 4.2 Evaluation of Upper Extremity ........... 4 Extremity...................................................... 37 4.3.20 Robotics in Rehabilitation of Upper 4.2.1 Upper Extremity Asessement and Extremity Post-Stroke .................................. 38 Outcome Measures ........................................ 4 4.3.21 Virtual Reality ................................... 41 4.2.2 Motor Function ..................................... 5 4.3.22 Antidepressants and Upper Extremity 4.2.3 Dexterity................................................ 7 Function ....................................................... 42 4.2.4 ADLs ...................................................... 7 4.3.23 Peptides ........................................... -
Electronic Approaches to Restoration of Sight
Home Search Collections Journals About Contact us My IOPscience Electronic approaches to restoration of sight This content has been downloaded from IOPscience. Please scroll down to see the full text. 2016 Rep. Prog. Phys. 79 096701 (http://iopscience.iop.org/0034-4885/79/9/096701) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 171.64.108.170 This content was downloaded on 09/08/2016 at 17:30 Please note that terms and conditions apply. IOP Reports on Progress in Physics Reports on Progress in Physics Rep. Prog. Phys. Rep. Prog. Phys. 79 (2016) 096701 (29pp) doi:10.1088/0034-4885/79/9/096701 79 Review 2016 Electronic approaches to restoration of sight © 2016 IOP Publishing Ltd G A Goetz1,2 and D V Palanker1,3 RPPHAG 1 Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA 2 Neurosurgery, Stanford University, Stanford, CA 94305, USA 096701 3 Ophthalmology, Stanford University, Stanford, CA 94305, USA E-mail: [email protected] and [email protected] G A Goetz and D V Palanker Received 11 November 2014, revised 11 April 2016 Accepted for publication 23 May 2016 Electronic approaches to restoration of sight Published 9 August 2016 Abstract Printed in the UK Retinal prostheses are a promising means for restoring sight to patients blinded by the gradual atrophy of photoreceptors due to retinal degeneration. They are designed to reintroduce ROP information into the visual system by electrically stimulating surviving neurons in the retina. This review outlines the concepts and technologies behind two major approaches to retinal prosthetics: epiretinal and subretinal. -
Cortical Responses to Vagus Nerve Stimulation Are Modulated by Brain State in Nonhuman Primates Irene Rembado1, Weiguo Song2, David K
Cerebral Cortex, 2021;00: 1–19 https://doi.org/10.1093/cercor/bhab158 Original Article ORIGINAL ARTICLE Downloaded from https://academic.oup.com/cercor/advance-article/doi/10.1093/cercor/bhab158/6306501 by guest on 06 July 2021 Cortical Responses to Vagus Nerve Stimulation Are Modulated by Brain State in Nonhuman Primates Irene Rembado1, Weiguo Song2, David K. Su3, Ariel Levari4, Larry E. Shupe4, Steve Perlmutter4, Eberhard Fetz4 and Stavros Zanos2 1MindScope Program, Allen Institute, 615 Westlake Ave N., Seattle, WA 98103, USA, 2Institute of Bioelectronic Medicine, Feinstein Institutes for Medical Research, Manhasset NY 11030, USA, 3Providence Regional Medical Center Cranial Joint and Spine Clinic, Everett, WA 98201, USA and 4Department of Physiology & Biophysics, University of Washington, Seattle, WA 98195, USA Address correspondence to Irene Rembado, MindScope Program at the Allen Institute, 615 Westlake Ave N., Seattle, WA 98103, USA. Email: [email protected]; Stavros Zanos, Institute of Bioelectronic Medicine, Feinstein Institutes for Medical Research, 350 Community Drive, Manhasset NY 11030, USA. Email: [email protected] Abstract Vagus nerve stimulation (VNS) has been tested as therapy for several brain disorders and as a means to modulate cortical excitability and brain plasticity. Cortical effects of VNS, manifesting as vagal-evoked potentials (VEPs), are thought to arise from activation of ascending cholinergic and noradrenergic systems. However, it is unknown whether those effects are modulated by brain state at the time of stimulation. In 2 freely behaving macaque monkeys, we delivered short trains of 5 pulses to the left cervical vagus nerve at different frequencies (5-300 Hz) while recording local field potentials (LFPs) from sites in contralateral prefrontal, sensorimotor and parietal cortical areas.