The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform
Kara M. Haupt - One of the best experts on this subject based on the ideXlab platform.
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Audiological Correlates of Speech Understanding Deficits in Elderly Listeners with Mild-to-Moderate Hearing Loss. III. Factor Representation
Ear and hearing, 1997Co-Authors: Pierre L. Divenyi, Kara M. HauptAbstract:Objective: The objective of the study was to determine the major factors that underlie auditory/audiological performance measures in an elderly population, with particular emphasis on finding those factors responsible for speech understanding under specific conditions of interference. Design: Audiological status and auditory performance of a group of elderly (60- to 81-yr-old) and normal-hearing young (18- to 30-yr-old) individuals was determined through a test battery. When present, the hearing loss of elderly subjects was symmetrical in the two ears and, at most, moderate. The battery included tests of speech intelligibility on the word and sentence levels, with and without the presence of interfering speech. In addition to pure-tone and speech reception Thresholds, Perception of spectrally or temporally distorted speech as well as auditory resolution of frequency, time, and space were tested. Two tests received special consideration: the Speech Perception In Noise Test and the Modified Rhyme Reverberation Test. Taking the overall results as well as various subsets of the results, principal component analyses were conducted to identify major factors underlying auditory performance.
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Audiological correlates of speech understanding deficits in elderly listeners with mild-to-moderate hearing loss. II. Correlation analysis.
Ear and hearing, 1997Co-Authors: Pierre L. Divenyi, Kara M. HauptAbstract:Objective: The study was conducted to determine the relationship between measures of auditory performance in elderly individuals. Specifically, its goal was to uncover a set of measures correlated with the set of measures of speech understanding under specific conditions of interference to gain a better understanding of decline of the cocktail party effect in aging. Design: Audiological status and auditory performance of a group of elderly (60- to 81-yr-old) individuals were determined through a test battery. When present, the hearing loss of elderly subjects was symmetrical in the two ears and, at most, moderate. The battery included tests of speech intelligibility on the word and sentence levels, with and without the presence of interfering speech. In addition to pure-tone and speech reception Thresholds, Perception of spectrally or temporally distorted speech and auditory resolution of frequency, time, and space were tested. Two tests received special consideration: the Speech Perception In Noise Test and the Modified Rhyme Reverberation Test. Results: Results indicated that, despite the nearly normal hearing levels that characterized much of the subject group, auditory sensitivity measures showed persistent correlation to all other measures, with the exception of auditory resolution regarding frequency, time, and space. As a set, sensitivity measures accounted for more than 85% of the variance. When auditory sensitivity was controlled for, other factors underlying speech processing in the presence of interfering stimuli were uncovered, factors most likely related to the ability to perceptually segregate one speech signal from another. Conclusions: The findings suggest that, to determine the relationship between audiological/auditory test results of an elderly population, it is important to remove the effects of hearing loss through appropriate statistical methods.
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Audiological Correlates of Speech Understanding Deficits in Elderly Listeners with Mild-to-moderate Hearing Loss. I. Age and Lateral Asymmetry Effects
Ear and hearing, 1997Co-Authors: Pierre L. Divenyi, Kara M. HauptAbstract:Objective The study was conducted to answer two questions: 1) Which auditory measures detect impairments attributable to age rather than hearing loss? 2) Among the elderly, is there a lateral asymmetry of performance? Design Audiological status and auditory performance of a group of elderly (60 to 81 yr old) and normal-hearing young (18 to 30 yr old) individuals were determined through a test battery. When present, the hearing loss of elderly subjects was symmetrical in the two ears and, at most, moderate. The battery included tests of speech intelligibility on the word and sentence levels, with and without the presence of interfering speech. In addition to pure-tone and speech reception Thresholds, Perception of spectrally or temporally distorted speech and auditory resolution of frequency, time, and space were tested. Two tests received special consideration: the Speech Perception In Noise Test and the Modified Rhyme Reverberation Test. Results Results indicated that 1) hearing loss was a major factor differentiating auditory performance of elderly and young individuals, and 2) genuine age-related deficits were found in measures assessing auditory resolution and the ability to utilize spatial, temporal, and/or linguistic context information to perceptually separate a speech target from surrounding speech noise. Furthermore, the elderly group exhibited a right-ear advantage, caused by left-ear deficits, in tests measuring central auditory processing and a slight left-ear advantage in tests measuring peripheral auditory resolution. Conclusions The findings suggest that, after controlling for the effect of hearing loss, there are a number of test measures in which performance of elderly and young listeners differs. Regarding lateral asymmetry, a disproportionate decline in auditory processing in the left ear of elderly individuals has been demonstrated. The major clinical conclusion is that, when testing an elderly group's performance regarding any given auditory function, the influence of pure-tone threshold elevations, no matter how mild, cannot be disregarded.
Pierre L. Divenyi - One of the best experts on this subject based on the ideXlab platform.
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Audiological Correlates of Speech Understanding Deficits in Elderly Listeners with Mild-to-Moderate Hearing Loss. III. Factor Representation
Ear and hearing, 1997Co-Authors: Pierre L. Divenyi, Kara M. HauptAbstract:Objective: The objective of the study was to determine the major factors that underlie auditory/audiological performance measures in an elderly population, with particular emphasis on finding those factors responsible for speech understanding under specific conditions of interference. Design: Audiological status and auditory performance of a group of elderly (60- to 81-yr-old) and normal-hearing young (18- to 30-yr-old) individuals was determined through a test battery. When present, the hearing loss of elderly subjects was symmetrical in the two ears and, at most, moderate. The battery included tests of speech intelligibility on the word and sentence levels, with and without the presence of interfering speech. In addition to pure-tone and speech reception Thresholds, Perception of spectrally or temporally distorted speech as well as auditory resolution of frequency, time, and space were tested. Two tests received special consideration: the Speech Perception In Noise Test and the Modified Rhyme Reverberation Test. Taking the overall results as well as various subsets of the results, principal component analyses were conducted to identify major factors underlying auditory performance.
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Audiological correlates of speech understanding deficits in elderly listeners with mild-to-moderate hearing loss. II. Correlation analysis.
Ear and hearing, 1997Co-Authors: Pierre L. Divenyi, Kara M. HauptAbstract:Objective: The study was conducted to determine the relationship between measures of auditory performance in elderly individuals. Specifically, its goal was to uncover a set of measures correlated with the set of measures of speech understanding under specific conditions of interference to gain a better understanding of decline of the cocktail party effect in aging. Design: Audiological status and auditory performance of a group of elderly (60- to 81-yr-old) individuals were determined through a test battery. When present, the hearing loss of elderly subjects was symmetrical in the two ears and, at most, moderate. The battery included tests of speech intelligibility on the word and sentence levels, with and without the presence of interfering speech. In addition to pure-tone and speech reception Thresholds, Perception of spectrally or temporally distorted speech and auditory resolution of frequency, time, and space were tested. Two tests received special consideration: the Speech Perception In Noise Test and the Modified Rhyme Reverberation Test. Results: Results indicated that, despite the nearly normal hearing levels that characterized much of the subject group, auditory sensitivity measures showed persistent correlation to all other measures, with the exception of auditory resolution regarding frequency, time, and space. As a set, sensitivity measures accounted for more than 85% of the variance. When auditory sensitivity was controlled for, other factors underlying speech processing in the presence of interfering stimuli were uncovered, factors most likely related to the ability to perceptually segregate one speech signal from another. Conclusions: The findings suggest that, to determine the relationship between audiological/auditory test results of an elderly population, it is important to remove the effects of hearing loss through appropriate statistical methods.
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Audiological Correlates of Speech Understanding Deficits in Elderly Listeners with Mild-to-moderate Hearing Loss. I. Age and Lateral Asymmetry Effects
Ear and hearing, 1997Co-Authors: Pierre L. Divenyi, Kara M. HauptAbstract:Objective The study was conducted to answer two questions: 1) Which auditory measures detect impairments attributable to age rather than hearing loss? 2) Among the elderly, is there a lateral asymmetry of performance? Design Audiological status and auditory performance of a group of elderly (60 to 81 yr old) and normal-hearing young (18 to 30 yr old) individuals were determined through a test battery. When present, the hearing loss of elderly subjects was symmetrical in the two ears and, at most, moderate. The battery included tests of speech intelligibility on the word and sentence levels, with and without the presence of interfering speech. In addition to pure-tone and speech reception Thresholds, Perception of spectrally or temporally distorted speech and auditory resolution of frequency, time, and space were tested. Two tests received special consideration: the Speech Perception In Noise Test and the Modified Rhyme Reverberation Test. Results Results indicated that 1) hearing loss was a major factor differentiating auditory performance of elderly and young individuals, and 2) genuine age-related deficits were found in measures assessing auditory resolution and the ability to utilize spatial, temporal, and/or linguistic context information to perceptually separate a speech target from surrounding speech noise. Furthermore, the elderly group exhibited a right-ear advantage, caused by left-ear deficits, in tests measuring central auditory processing and a slight left-ear advantage in tests measuring peripheral auditory resolution. Conclusions The findings suggest that, after controlling for the effect of hearing loss, there are a number of test measures in which performance of elderly and young listeners differs. Regarding lateral asymmetry, a disproportionate decline in auditory processing in the left ear of elderly individuals has been demonstrated. The major clinical conclusion is that, when testing an elderly group's performance regarding any given auditory function, the influence of pure-tone threshold elevations, no matter how mild, cannot be disregarded.
Thomas L. Yearwood - One of the best experts on this subject based on the ideXlab platform.
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Pulse Width Programming in Spinal Cord Stimulation: A Clinical Study
Pain Physician, 2010Co-Authors: Thomas L. YearwoodAbstract:Background: With advances in spinal cord stimulation (SCS) technology, particularly rechargeable implantable, patients are now being offered a wider range of parameters to treat their pain. In particular, pulse width (PW) programming ranges of rechargeable implantable pulse generators now match that of radiofrequency systems (with programmability up to 1000µs). The intent of the present study was to investigate the effects of varying PW in SCS. Objective: To understand the effects of PW programming in spinal cord stimulation (SCS). Design: Single-center, prospective, randomized, single-blind evaluation of the technical and clinical outcomes of PW programming. Setting: Acute, outpatient follow-up. Methods: Subjects using fully-implanted SCS for > 3 months to treat chronic intractable low back and/or leg pain. Programming of a wide range (50-1000μs) of programmed PW settings using each patient’s otherwise unchanged ‘walk-in’ program. Outcome Measures: Paresthesia Thresholds (Perception, maximum comfortable, discomfort), paresthesia coverage and patient choice of tested programs. Results: We found strength-duration parameters of chronaxie and rheobase to be 295 (242 – 326) μs and 2.5 (1.3 – 3.3) mA, respectively. The median PW of all patients’ ‘walk-out’ programs was 400μs, approximately 48% higher than median chronaxie (P = 0.01), suggesting that chronaxie may not relate to patient-preferred stimulation settings. We found that 7/19 patients selected new PW programs, which significantly increased their paresthesia-pain overlap by 56% on average (P = 0.047). We estimated that 10/19 patients appeared to have greater paresthesia coverage, and 8/19 patients appeared to display a ‘caudal shift’ of paresthesia coverage with increased PW. Limitations: Small number of patients. Conclusions: Variable PW programming in SCS appears to have clinical value, demonstrated by some patients improving their paresthesia-pain overlap, as well as the ability to increase and even ‘steer’ paresthesia coverage. Key words: Spinal cord stimulation, pulse width, paresthesia, dermatome, implantable pulse generator, neurostimulation, chronic pain, neuropathic, dorsal column, dorsal root, chronaxie.
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Pulse width programming in spinal cord stimulation: a clinical study.
Pain physician, 2010Co-Authors: Thomas L. Yearwood, Bradley Lawrence Hershey, Kerry Bradley, Dongchul LeeAbstract:BACKGROUND With advances in spinal cord stimulation (SCS) technology, particularly rechargeable implantable, patients are now being offered a wider range of parameters to treat their pain. In particular, pulse width (PW) programming ranges of rechargeable implantable pulse generators now match that of radiofrequency systems (with programmability up to 1000 microseconds. The intent of the present study was to investigate the effects of varying PW in SCS. OBJECTIVE To understand the effects of PW programming in spinal cord stimulation (SCS). DESIGN Single-center, prospective, randomized, single-blind evaluation of the technical and clinical outcomes of PW programming. SETTING Acute, outpatient follow-up. METHODS Subjects using fully-implanted SCS for > 3 months to treat chronic intractable low back and/or leg pain. Programming of a wide range (50-1000 microseconds) of programmed PW settings using each patient's otherwise unchanged 'walk-in' program. OUTCOME MEASURES Paresthesia Thresholds (Perception, maximum comfortable, discomfort), paresthesia coverage and patient choice of tested programs. RESULTS We found strength-duration parameters of chronaxie and rheobase to be 295 (242 - 326) microseconds and 2.5 (1.3 - 3.3) mA, respectively. The median PW of all patients' 'walk-out' programs was 400 microseconds, approximately 48% higher than median chronaxie (p = 0.01), suggesting that chronaxie may not relate to patient-preferred stimulation settings. We found that 7/19 patients selected new PW programs, which significantly increased their paresthesia-pain overlap by 56% on average (p = 0.047). We estimated that 10/19 patients appeared to have greater paresthesia coverage, and 8/19 patients appeared to display a 'caudal shift' of paresthesia coverage with increased PW. LIMITATIONS Small number of patients. CONCLUSIONS Variable PW programming in SCS appears to have clinical value, demonstrated by some patients improving their paresthesia-pain overlap, as well as the ability to increase and even 'steer' paresthesia coverage.
Dongchul Lee - One of the best experts on this subject based on the ideXlab platform.
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Pulse width programming in spinal cord stimulation: a clinical study.
Pain physician, 2010Co-Authors: Thomas L. Yearwood, Bradley Lawrence Hershey, Kerry Bradley, Dongchul LeeAbstract:BACKGROUND With advances in spinal cord stimulation (SCS) technology, particularly rechargeable implantable, patients are now being offered a wider range of parameters to treat their pain. In particular, pulse width (PW) programming ranges of rechargeable implantable pulse generators now match that of radiofrequency systems (with programmability up to 1000 microseconds. The intent of the present study was to investigate the effects of varying PW in SCS. OBJECTIVE To understand the effects of PW programming in spinal cord stimulation (SCS). DESIGN Single-center, prospective, randomized, single-blind evaluation of the technical and clinical outcomes of PW programming. SETTING Acute, outpatient follow-up. METHODS Subjects using fully-implanted SCS for > 3 months to treat chronic intractable low back and/or leg pain. Programming of a wide range (50-1000 microseconds) of programmed PW settings using each patient's otherwise unchanged 'walk-in' program. OUTCOME MEASURES Paresthesia Thresholds (Perception, maximum comfortable, discomfort), paresthesia coverage and patient choice of tested programs. RESULTS We found strength-duration parameters of chronaxie and rheobase to be 295 (242 - 326) microseconds and 2.5 (1.3 - 3.3) mA, respectively. The median PW of all patients' 'walk-out' programs was 400 microseconds, approximately 48% higher than median chronaxie (p = 0.01), suggesting that chronaxie may not relate to patient-preferred stimulation settings. We found that 7/19 patients selected new PW programs, which significantly increased their paresthesia-pain overlap by 56% on average (p = 0.047). We estimated that 10/19 patients appeared to have greater paresthesia coverage, and 8/19 patients appeared to display a 'caudal shift' of paresthesia coverage with increased PW. LIMITATIONS Small number of patients. CONCLUSIONS Variable PW programming in SCS appears to have clinical value, demonstrated by some patients improving their paresthesia-pain overlap, as well as the ability to increase and even 'steer' paresthesia coverage.
Kerry Bradley - One of the best experts on this subject based on the ideXlab platform.
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Pulse width programming in spinal cord stimulation: a clinical study.
Pain physician, 2010Co-Authors: Thomas L. Yearwood, Bradley Lawrence Hershey, Kerry Bradley, Dongchul LeeAbstract:BACKGROUND With advances in spinal cord stimulation (SCS) technology, particularly rechargeable implantable, patients are now being offered a wider range of parameters to treat their pain. In particular, pulse width (PW) programming ranges of rechargeable implantable pulse generators now match that of radiofrequency systems (with programmability up to 1000 microseconds. The intent of the present study was to investigate the effects of varying PW in SCS. OBJECTIVE To understand the effects of PW programming in spinal cord stimulation (SCS). DESIGN Single-center, prospective, randomized, single-blind evaluation of the technical and clinical outcomes of PW programming. SETTING Acute, outpatient follow-up. METHODS Subjects using fully-implanted SCS for > 3 months to treat chronic intractable low back and/or leg pain. Programming of a wide range (50-1000 microseconds) of programmed PW settings using each patient's otherwise unchanged 'walk-in' program. OUTCOME MEASURES Paresthesia Thresholds (Perception, maximum comfortable, discomfort), paresthesia coverage and patient choice of tested programs. RESULTS We found strength-duration parameters of chronaxie and rheobase to be 295 (242 - 326) microseconds and 2.5 (1.3 - 3.3) mA, respectively. The median PW of all patients' 'walk-out' programs was 400 microseconds, approximately 48% higher than median chronaxie (p = 0.01), suggesting that chronaxie may not relate to patient-preferred stimulation settings. We found that 7/19 patients selected new PW programs, which significantly increased their paresthesia-pain overlap by 56% on average (p = 0.047). We estimated that 10/19 patients appeared to have greater paresthesia coverage, and 8/19 patients appeared to display a 'caudal shift' of paresthesia coverage with increased PW. LIMITATIONS Small number of patients. CONCLUSIONS Variable PW programming in SCS appears to have clinical value, demonstrated by some patients improving their paresthesia-pain overlap, as well as the ability to increase and even 'steer' paresthesia coverage.