Lendra Friesen

Lendra Friesen
University of Connecticut | UConn · Department of Speech, Language and Hearing Sciences

About

28
Publications
4,025
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1,798
Citations
Citations since 2017
1 Research Item
727 Citations
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2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120

Publications

Publications (28)
Article
Objectives: To determine whether preoperative steroids can improve hearing outcomes in cochlear implantation (CI). Methods: This is a randomized controlled trial involving 30 postlingual deaf CI patients. Subjects had preoperative thresholds of better than or equal to 80 dB at 125 and 250 Hz, and better than or equal to 90 dB at 500 and 1,000 Hz...
Article
Cortical auditory evoked potentials (CAEP) are used to evaluate cochlear implant (CI) patient auditory pathways, but the CI device produces an electrical artifact, which obscures the relevant information in the neural response. Currently there are multiple methods, which attempt to recover the neural response from the contaminated CAEP, but there i...
Article
Objectives/HypothesisTo investigate whether a contralateral routing of signal (CROS) microphone combined with a unilateral cochlear implant (CI) results in hearing improvement after a prolonged trial period.Study DesignA prospective experimental trial was undertaken on a group of 10 postlingually deafened adults who are experienced CI users.Methods...
Article
When patients with cochlear implants (CI) undergo cortical auditory evoked potential (CAEP) tests to evaluate their hearing, a large electrical artifact introduced by the CI obscures the relevant information in the signal. Several methods have been developed for the purpose of removing the CI artifact; however, there is no gold standard (i.e., pati...
Article
Ménière's disease (MD) that results in bilateral severe to profound sensorineural hearing loss is a rare indication for cochlear implantation; only a few studies exist documenting performance in these patients. The primary objective was to compare the difference in preoperative to 12-month postoperative speech perception scores among subjects with...
Article
Hearing preservation (HP) in the context of cochlear implantation (CI) is indicative of an atraumatic insertion, which could potentially offer a clinical advantage to performance, whether such preservation was intended for the application of electoacoustic stimulation (EAS). Our goal was to determine the degree of HP after the implantation of a ful...
Article
The purpose of the study was to investigate the potential clinical advantages of incorporating a contralateral routing of signals (CROS) microphone in unilateral cochlear implant (CI) users. A prospective study was undertaken on a group of 21 postlingually deafened adults who were all implanted with the same multichannel CI system. Performance with...
Article
To investigate the effects of unilateral multi-channel cochlear implant surgery on health-related quality of life and to determine if there is an age-related impact of cochlear implantation on these effects. Prospective study. Tertiary health-care center. The Short Form-36 survey (SF-36) was administered to determine the health-related quality of l...
Article
The primary purpose of this study was to evaluate a group of postlingually deafened adults, whose aided speech recognition exceeded commonly accepted candidacy criteria for implantation. The study aimed to define performance and qualitative outcomes of cochlear implants in these individuals compared with their optimally fitted hearing aid(s). Retro...
Article
To investigate telephone use in cochlear implant patients and to determine factors most likely to influence telephone use. Surveys were mailed to 504 cochlear implant patients treated at Sunnybrook Health Sciences Hospital. Two hundred four patients returned surveys (49%), 87% were classified as telephone users. No differences were found in age, pr...
Article
Cochlear implantation is now the standard of care in patients with significant sensorineural hearing loss. It is well known that patients with severe hearing loss also experience disabling tinnitus. The purpose of this study was to assess the effects of cochlear implants on the perception of tinnitus using the Tinnitus Handicap Inventory (THI). Pro...
Article
Cochlear implants (CIs) allow many profoundly deaf individuals to regain speech understanding. However, the ability to understand speech does not necessarily guarantee music enjoyment. Enabling a CI user to recover the ability to perceive and enjoy the complexity of music remains a challenge determined by many factors. (1) To construct a novel, att...
Article
Cochlear implantation has revolutionized the management of those who suffer from severe-to-profound hearing loss because many patients now achieve excellent speech understanding with objective testing. Nevertheless, speech understanding in noisy conditions and music appreciation remain significant challenges to cochlear implant (CI) users. Music ap...
Article
Background/objective: Only a small number of patients with Meniere Disease (MD) go on to have bilateral severe-profound sensorineural hearing loss. These patients may benefit from cochlear implantation (CI) but only a few small studies have been published describing outcomes. Our goal was to describe our experience with 21 such patients. Methods: C...
Article
Full-text available
When cortical auditory evoked potentials (CAEPs) are recorded in individuals with a cochlear implant (CI), electrical artifact can make the CAEP difficult or impossible to measure. Since increasing the interstimulus interval (ISI) increases the amplitude of physiological responses without changing the artifact, subtracting CAEPs recorded with a sho...
Article
Full-text available
(1) To determine if consonant-vowel-consonant (CVC) syllables [Hillenbrand J, Getty L, Clark M, Wheeler K. Acoustic characteristics of American English vowels. J Acoust Soc Am 1995;97:3099-3111] could be used to evoke cortical far field response patterns in humans, (2) to characterize the effects of cochlear implant-simulated channel number on the...
Article
The objectives of this study were to determine: 1) whether the acoustic change complex (ACC) could be reliably recorded in cochlear implant listeners and, 2) whether different speech sounds evoke distinct ACC patterns. Eight adults wearing the Nucleus-24 cochlear implant (CI) were tested using naturally produced speech tokens /si/ and /i/. Stimuli...
Article
To determine if (1) evoked potentials elicited by amplified speech sounds (/si/ and /[symbol: see text]/) can be recorded reliably in individuals, (2) amplification alters neural response patterns, and (3) different amplified speech sounds evoke different neural patterns. Cortical evoked potentials were recorded in sound field from seven normal-hea...
Article
Phoneme and speech recognition were measured as a function of stimulation pulse rate in 12 listeners with three types of cochlear implants. Identification of consonants and vowels and recognition of words and sentences were measured in 5 Clarion C1 subjects fit with continuous interleaved sampling (CIS) processors having 4 or 8 electrodes, 4 Nucleu...
Chapter
Full-text available
Cochlear implants, besides restoring hearing sensation to otherwise deaf individuals, provide an excellent tool with which to investigate how the human central nervous system (CNS) processes complex patterns of sensory information. Throughout the lifetime of normal-hearing persons, the auditory CNS has been continually trained to extract meaningful...
Article
Full-text available
To determine if naturally produced speech stimuli evoke distinct neural response patterns that can be reliably recorded in individuals. Auditory cortical evoked potentials were obtained from seven normal-hearing young adults in response to four naturally produced speech tokens (/bi/, /pi/, /[U0283]i/, and /si/). Stimuli were tokens from the standar...
Article
Full-text available
Speech recognition was measured as a function of spectral resolution (number of spectral channels) and speech-to-noise ratio in normal-hearing (NH) and cochlear-implant (CI) listeners. Vowel, consonant, word, and sentence recognition were measured in five normal-hearing listeners, ten listeners with the Nucleus-22 cochlear implant, and nine listene...
Article
Full-text available
Speech recognition performance was measured as a function of electrode in two experiments with the Nucleus-22 cochlear implant using 4-electrode SPEAK speech processors. In experiment 1, the four stimulated electrode pairs were shifted in 0.75-mm steps over 3 mm in the apical-basal direction. In experiment 2, the four electrodes were closely spaced...
Article
Full-text available
Phoneme recognition performance in patients implanted with the Nucleus 22 cochlear implant is affected by the frequency-to-electrode assignment. Multiple electrodes in modern cochlear implants are intended to deliver frequency-specific information to different tonotopic locations along the cochlea. However, the relation between the electrode locati...
Article
Thesis (Ph. D.)--University of Washington, 2007. The purpose of this study was to examine the effect of cochlear implant (CI) channel number on the neural representation of acoustic changes contained in speech. Eleven normal hearing monolingual English speaking adults were tested. Unprocessed naturally spoken syllables, containing medial vowels, as...

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