Using Electrical Stimulation Responses to Understand Cochlear Implant Status PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Using Electrical Stimulation Responses to Understand Cochlear Implant Status PDF full book. Access full book title Using Electrical Stimulation Responses to Understand Cochlear Implant Status by Simone De Rijk. Download full books in PDF and EPUB format.
Author: Simone De Rijk
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author: Simone De Rijk
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author: Joseph M. Miller
Publisher: Springer Science & Business Media
ISBN: 1461232562
Category : Medical
Languages : en
Pages : 416
Get Book Here
Book Description
This volume describes a new direction in technological and biomedical developments for profoundly deaf individuals. The first section covers topics of tissue characteristics, such as responses to electrical stimulation and computer modelling of cochlea currents. Perception of acoustic signals, responses and behavioral pattern as well as psychophysical aspects are treated in the second part. Part III is addressed to perspectives and challenges of encoding schemes. Reports on studies of acoustic and electrical encoding of temporal information, speech features with cochlear implants as well as psychophysical and speech perceptual studies will allow further strategies for cochlea implants.
Author: Matthew Charles Schoenecker
Publisher:
ISBN:
Category :
Languages : en
Pages : 186
Get Book Here
Book Description
Cochlear implants (CIs) are neural prostheses that currently provide acoustic sensation to more than 120,000 profoundly hearing-impaired people throughout the world. The majority of these CI users are able to understand speech without lip reading and to converse over the telephone. The most fortunate among them can even perform and appreciate music. Unfortunately, however, many CI recipients receive much less benefit from their devices. In order to examine the neuronal bases for these disparate outcomes, a recording system was developed to overcome specific technical limitations in previous studies that recorded neuronal responses to cochlear implant stimulation in animal models. This recording system was then used in two studies comparing responses to normal acoustic stimulation and electrical cochlear implant stimulation in guinea pigs and cats. The design of the recording system included a 32-channel recording amplifier and a software technique for removing stimulus artifacts from recordings of neural responses to high-rate electrical stimulation. Contemporary cochlear implants often deliver current pulse trains with carrier rates of 1000 pulses/s or higher. In neurophysiology studies, this electrical stimulation produces artifacts that are typically much larger than neuronal responses. Therefore, the recording system was specifically designed to record neuronal responses and cancel these electrical stimulus artifacts. When biphasic full-scale-input pulses (1.5-V) are applied directly to the amplifier inputs, each recording channel settles to 20 micro-volts in less than 80 microseconds. This fast recovery makes it likely that the recording electrode-electrolyte interface, not the recording electronics, will limit artifact settling times. Artifacts are blanked in software, allowing flexibility in the choice of blanking period and the possibility of recovering neural data occurring simultaneously with non-saturating artifacts. The system has been used in-vivo to record central neuronal responses to intracochlear electrical stimulation at rates up to 2000 pulses/s. Using this recording system, systematic and quantitative comparisons of inferior-colliculus responses to acoustic stimulation and electrical stimulation in two configurations (monopolar and bipolar) were carried in guinea pigs and cats. Previous cochlear implant studies using isolated electrical stimulus pulses in animal models have reported that monopolar stimulus configurations elicit broad extents of neuronal activation within the central auditory system--much broader than the activation patterns produced by bipolar electrode pairs or acoustic tones. However, psychophysical and speech reception studies that use sustained pulse trains do not show clear performance differences between monopolar and bipolar configurations. To evaluate whether monopolar intracochlear stimulation can produce selective excitation of the inferior colliculus, activation widths were determined along the tonotopic axis of the inferior colliculus for acoustic tones and 1000-pulse/s electrical pulse trains in guinea pigs and cats. Electrical pulse trains were presented using an array of 6-12 stimulating electrodes distributed longitudinally along a space-filling silicone carrier positioned in the scala tympani of the cochlea. The data indicated that for monopolar, bipolar, and acoustic stimuli, activation widths were significantly narrower for sustained responses than for the transient response to the stimulus onset. Furthermore, monopolar and bipolar stimuli elicited similar activation widths when compared at stimulus levels that produced similar peak spike rates. Surprisingly, monopolar and bipolar stimuli produced narrower sustained activation than 60 dB SPL acoustic tones when compared at stimulus levels that produced similar peak spike rates. Therefore, the conclusion from these experiments was that intracochlear electrical stimulation using monopolar pulse trains can produce activation patterns that are at least as selective as bipolar or acoustic stimulation, if stimulus intensities are appropriately matched. The second study compared responses to acoustic and monopolar electrical stimuli that were sinusoidally amplitude modulated (SAM), in order to better model the complex signals delivered by CI processors. For both normal hearing listeners and cochlear implant users, SAM signals produce psychophysical interactions that can extend across large differences in carrier frequency or large intracochlear electrode separations. However, the neural correlates of these phenomena are not well understood. This study was designed to determine whether SAM stimuli elicit activation across a broader extent of the frequency axis of the inferior colliculus than unmodulated steady-state stimuli, and whether this activation is strongly phase locked to the SAM stimulus envelope. To address these questions neuronal activity in the inferior colliculus of guinea pigs, normal cats and chronically deafened cats was recorded in response to acoustic and electrical stimulation. Quantitative analysis of recordings indicated that the extent of inferior colliculus activation was up to 70% broader for SAM stimuli than for unmodulated steady-state stimuli in normal cats and guinea pigs and 160% broader in chronically deafened cats. This activity was also phase-locked to the SAM envelope across a broad extent of the frequency axis of the inferior colliculus. These results suggest that a number of cross-carrier frequency interactions for SAM stimuli could occur at the level of the inferior colliculus. They also show that direct comparisons of responses to acoustic and electrical SAM stimuli can reveal attributes of neural processing that underlie specific psychophysical findings in CI recipients--and thereby can provide a powerful basis for guiding development of new processing strategies for future cochlear implants.
Author: Paul W. Flint
Publisher: Saunders
ISBN: 9781455746965
Category : Face
Languages : en
Pages : 0
Get Book Here
Book Description
2015 BMA Medical Book Awards Highly Commended in Surgical Specialties Category! Now in its 6th edition, Cummings Otolaryngology remains the world's most detailed and trusted source for superb guidance on all facets of head and neck surgery. Completely updated with the latest minimally invasive procedures, new clinical photographs, line drawings, and new surgical videos, this latest edition equips you to implement all the newest discoveries, techniques, and technologies that are shaping patient outcomes. Be certain with expert, dependable, accurate answers for every stage of your career from the most comprehensive, multi-disciplinary text in the field! Overcome virtually any clinical challenge with detailed, expert coverage of every area of head and neck surgery, authored by hundreds of leading luminaries in the field. Experience clinical scenarios with vivid clarity through a heavily illustrated, full-color format which includes approximately 3,200 images and over 40 high quality procedural videos. Get truly diverse perspectives and worldwide best practices from a multi-disciplinary team of contributors and editors comprised of the world's leading experts. Glean all essential, up-to-date, need-to-know information. All chapters have been meticulously updated; several extensively revised with new images, references, and content. Stay at the forefront of your field with the most updated information on minimally-invasive surgical approaches to the entire skull base, vestibular implants and vestibular management involving intratympanic and physical therapy-based approaches, radiosurgical treatment of posterior fossa and skull base neoplasms, and intraoperative monitoring of cranial nerve and CNS function. Apply the latest treatment options in pediatric care with new chapters on pediatric sleep disorders, pediatric infectious disease, and evaluation and management of the infant airway. Find what you need faster through a streamlined format, reorganized chapters, and a color design that expedites reference. Manage many of the most common disorders with treatment options derived from their genetic basis. Assess real-world effectiveness and costs associated with emergent technologies and surgical approaches introduced to OHNS over the past 10 years. Incorporate recent findings about endoscopic, microscopic, laser, surgically-implantable, radiosurgical, neurophysiological monitoring, MR- and CT-imaging, and other timely topics that now define contemporary operative OHNS. Take it with you anywhere! With Expert Consult, you'll have access the full text, video clips, and more online, and as an eBook - at no additional cost!
Author: John K. Niparko
Publisher: Lippincott Williams & Wilkins
ISBN: 9780781777490
Category : Medical
Languages : en
Pages : 372
Get Book Here
Book Description
Thoroughly updated for its Second Edition, this book provides an in-depth discussion on prosthetic restoration of hearing via implantation. The text succinctly discusses the scientific principles behind cochlear implants, examines the latest technology, and offers practical advice on how to assess candidates, how to implant the devices, and what rehabilitation is most effective. The authors thoroughly examine the outcomes of cochlear implantation, the impact on the patient's quality of life, the benefits in relation to the costs, and the implications of cochlear implants for language and speech acquisition and childhood education.
Author: Ruth Y. Litovsky
Publisher: Springer Nature
ISBN: 3030571009
Category : Medical
Languages : en
Pages : 425
Get Book Here
Book Description
The field of Binaural Hearing involves studies of auditory perception, physiology, and modeling, including normal and abnormal aspects of the system. Binaural processes involved in both sound localization and speech unmasking have gained a broader interest and have received growing attention in the published literature. The field has undergone some significant changes. There is now a much richer understanding of the many aspects that comprising binaural processing, its role in development, and in success and limitations of hearing-aid and cochlear-implant users. The goal of this volume is to provide an up-to-date reference on the developments and novel ideas in the field of binaural hearing. The primary readership for the volume is expected to be academic specialists in the diverse fields that connect with psychoacoustics, neuroscience, engineering, psychology, audiology, and cochlear implants. This volume will serve as an important resource by way of introduction to the field, in particular for graduate students, postdoctoral scholars, the faculty who train them and clinicians.
Author: Chris de Souza
Publisher: Plural Publishing
ISBN: 1635502276
Category : Medical
Languages : en
Pages : 305
Get Book Here
Book Description
Implantable Hearing Devices is written for ear, nose, and throat surgeons in training who must know about implantable hearing devices as they advance in otologic surgery. It is also a resource for otologic surgeons desiring to know more about the devices available. The technology is evolving rapidly along with the criteria for candidacy, and this text covers the entire spectrum of implantable hearing devices that are available, including but not limited to cochlear implants. Complex issues are presented in an easy to understand format by a host of internationally well-respected authors. Many practitioners have to refer to multiple resources for answers to their questions because the discipline is changing so rapidly. Implantable Hearing Devices is a clear, concise, but comprehensive book that offers answers to the universal problems that otologic surgeons face. Disclaimer: Please note that ancillary content (such as documents, audio, and video, etc.) may not be included as published in the original print version of this book.
Author: Nina Kraus
Publisher: Springer
ISBN: 331947944X
Category : Medical
Languages : en
Pages : 306
Get Book Here
Book Description
This volume will cover a variety of topics, including child language development; hearing loss; listening in noise; statistical learning; poverty; auditory processing disorder; cochlear neuropathy; attention; and aging. It will appeal broadly to auditory scientists—and in fact, any scientist interested in the biology of human communication and learning. The range of the book highlights the interdisciplinary series of questions that are pursued using the auditory frequency-following response and will accordingly attract a wide and diverse readership, while remaining a lasting resource for the field.
Author: Institute of Medicine
Publisher: National Academies Press
ISBN: 0309176689
Category : Medical
Languages : en
Pages : 254
Get Book Here
Book Description
Evidence suggests that medical innovation is becoming increasingly dependent on interdisciplinary research and on the crossing of institutional boundaries. This volume focuses on the conditions governing the supply of new medical technologies and suggest that the boundaries between disciplines, institutions, and the private and public sectors have been redrawn and reshaped. Individual essays explore the nature, organization, and management of interdisciplinary R&D in medicine; the introduction into clinical practice of the laser, endoscopic innovations, cochlear implantation, cardiovascular imaging technologies, and synthetic insulin; the division of innovating labor in biotechnology; the government- industry-university interface; perspectives on industrial R&D management; and the growing intertwining of the public and proprietary in medical technology.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309092965
Category : Social Science
Languages : en
Pages : 321
Get Book Here
Book Description
Millions of Americans experience some degree of hearing loss. The Social Security Administration (SSA) operates programs that provide cash disability benefits to people with permanent impairments like hearing loss, if they can show that their impairments meet stringent SSA criteria and their earnings are below an SSA threshold. The National Research Council convened an expert committee at the request of the SSA to study the issues related to disability determination for people with hearing loss. This volume is the product of that study. Hearing Loss: Determining Eligibility for Social Security Benefits reviews current knowledge about hearing loss and its measurement and treatment, and provides an evaluation of the strengths and weaknesses of the current processes and criteria. It recommends changes to strengthen the disability determination process and ensure its reliability and fairness. The book addresses criteria for selection of pure tone and speech tests, guidelines for test administration, testing of hearing in noise, special issues related to testing children, and the difficulty of predicting work capacity from clinical hearing test results. It should be useful to audiologists, otolaryngologists, disability advocates, and others who are concerned with people who have hearing loss.
