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Stahl AN, Mondul JA, Alek KA, Hackett TA, Ramachandran R. Audiologic characterization using clinical physiological measures: Normative data from macaque monkeys. Hear Res 2022; 424:108568. [PMID: 35896044 PMCID: PMC9529828 DOI: 10.1016/j.heares.2022.108568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 06/28/2022] [Accepted: 07/08/2022] [Indexed: 12/16/2022]
Abstract
Clinical auditory physiological measures (e.g., auditory brainstem responses, ABRs, and distortion product otoacoustic emissions, DPOAEs) provide diagnostic specificity for differentially diagnosing overt hearing impairments, but they remain limited in their ability to detect specific sites of lesion and subtle levels of cochlear damage. Studies in animal models may hold the key to improve differential diagnosis due to the ability to induce tightly controlled and histologically verifiable subclinical cochlear pathologies. Here, we present a normative set of traditional and clinically novel physiological measures using ABRs and DPOAEs measured in a large cohort of male macaque monkeys. Given the high similarities between macaque and human auditory anatomy, physiology, and susceptibility to hearing damage, this normative data set will serve as a crucial baseline to investigate novel physiological measures to improve diagnostics. DPOAE amplitudes were robust at f2 = 1.22, L1/L2 = 65/55, increased with frequency up to 10 kHz, and exhibited high test re-test reliability. DPOAE thresholds were lowest from 2-10 kHz and highest < 2 kHz. ABRs with a standard clinical electrode montage (vertex-to-mastoid, VM) produced Waves I-IV with a less frequently observed Wave-I, and lower thresholds. ABRs with a vertex-to-tympanic membrane (VT) electrode montage produced a more robust Wave-I, but absent Waves II-IV and higher thresholds. Further study with the VM montage revealed amplitudes that increased with stimulus level and were largest in response to click stimuli, with Wave-II showing the largest ABR amplitude, followed by -IV and -I, with high inter- and intra-subject variability. ABR wave latencies decreased with stimulus level and frequency. When stimulus presentation rate increased or stimuli were presented in close temporal proximity, ABR amplitude decreased, and latency increased. These findings expand upon existing literature of normative clinical physiological data in nonhuman primates and lay the groundwork for future studies investigating the effects of noise-induced pathologies in macaques.
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Affiliation(s)
- Amy N Stahl
- Vanderbilt Neuroscience Graduate Program, Vanderbilt University, Nashville, TN 37212; Vanderbilt Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN 37212.
| | - Jane A Mondul
- Vanderbilt Neuroscience Graduate Program, Vanderbilt University, Nashville, TN 37212; Vanderbilt Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN 37212.
| | - Katy A Alek
- Vanderbilt Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN 37212.
| | - Troy A Hackett
- Vanderbilt Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN 37212.
| | - Ramnarayan Ramachandran
- Vanderbilt Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN 37212.
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Jha RH, Piker EG, Romero D. Effects of Age and Middle Ear on the Frequency Tuning of the cVEMP and oVEMP. J Am Acad Audiol 2022; 33:259-269. [PMID: 36343649 DOI: 10.1055/s-0042-1747910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Upward shift in the air conducted (AC) frequency tuning of vestibular evoked myogenic potentials (VEMPs) as an effect of aging is hypothesized to be due to the microstructural stiffening changes in the inner ear. However, with an AC stimulus, it may be possible that the shift in the frequency tuning of VEMPs as an effect of aging may also be due to contributions from the middle ear. PURPOSE The main aim of this study was to examine the effects of age on the frequency tuning of the cervical VEMP (cVEMP) and ocular VEMP (oVEMP) and determine the role of middle ear transmission characteristics in shaping these effects. RESEARCH DESIGN Standard group comparison. STUDY SAMPLE One-hundred seven participants divided in three groups: young adult, middle-age, and older adults with "normal" middle ear and negative history of neurological or vestibular complaints. DATA COLLECTION AND ANALYSES Middle ear measures included static admittance and middle ear resonant frequency. cVEMP and oVEMPs were elicited with AC tone bursts at 500, 750, and 1,000 Hz. RESULTS No significant effect of age was observed on any of the middle ear measures. There was a significant effect of age on the amplitude of the cVEMP, but this effect was frequency specific. The age-related reduction in cVEMP corrected amplitude was only observed when the eliciting stimulus was 500 or 750 Hz, with no significant effect observed with a 1,000 Hz stimulus. For the oVEMP, the effects of age were apparent at all stimulus frequencies. We also observed a general upward shift in the frequency tuning of both the cVEMP and oVEMP for middle-age and older adults, with 750 and 1,000 Hz yielding higher response rates and larger amplitudes among middle-aged and older adults. Measurements of middle ear did not significantly contribute to the observed findings. CONCLUSIONS The upward shift in frequency tuning of VEMPs among middle age and older adults could be due to the changes in the vestibular system and not from the middle ear. These results support the use of different frequency stimuli (i.e., 750 or 1,000 Hz) to elicit a VEMP if a response is absent using a 500 Hz stimulus, especially in patients over the age of 40.
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Affiliation(s)
- Raghav Hira Jha
- Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia
| | - Erin G Piker
- Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia
| | - Daniel Romero
- Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia
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Ibáñez-Contreras A, Poblano A, Arteaga-Silva M, Hernández-Godínez B, Hernández-Arciga U, Toledo R, Königsberg M. Visual, auditive and somatosensory pathways alterations in geriatric rhesus monkeys (Macaca mulatta). J Med Primatol 2016; 45:92-102. [PMID: 26956694 DOI: 10.1111/jmp.12211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/01/2016] [Indexed: 11/29/2022]
Abstract
BACKGROUND Synapses loss during aging is associated to neurophysiologic alterations that impair organism's health span, thus making the study and prevention of sensory decline relevant for healthy aging and welfare. Therefore the aim of this study was to obtain normative data related to the electrophysiological responses of the different neurosensory components in the visual, auditory and somatosensory pathways in healthy geriatric rhesus monkeys in captivity. METHODS Twenty-four rhesus monkeys were divided in two groups: (i) Geriatric monkeys, 20-30 years of age, and (ii) Young monkeys, 7 years of age. Evoked potentials were obtained from the visual, auditory and somatosensory pathways. RESULTS Regardless the sensory pathways evaluated, a significant delay in nerve conduction was observed in the geriatric group in comparison to the young group. CONCLUSIONS Evoked potentials allowed identifying changes generated during aging in rhesus monkeys and normative data for this species were obtained.
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Affiliation(s)
- A Ibáñez-Contreras
- Posgrado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico.,Centro de Investigación, Proyecto CAMINA A.C., Unidad de Primates No Humanos, Ciudad de México, Mexico.,Laboratorio de Primatología, Applied Research in Experimental Biomedicine S.A. de C.V. (APREXBIO), Ciudad de México, Mexico.,Biología Integral para Vertebrados (BIOINVERT®), Unidad de Experimentación Animal, Estado de México, Mexico.,Laboratorio de Bioenergética y envejecimiento celular, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico
| | - A Poblano
- Laboratorio de Neurofisiología Cognoscitiva, Instituto Nacional de Rehabilitación, Ciudad de México, Mexico
| | - M Arteaga-Silva
- Departamento Biología de la Reproducción, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico
| | - B Hernández-Godínez
- Posgrado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico.,Centro de Investigación, Proyecto CAMINA A.C., Unidad de Primates No Humanos, Ciudad de México, Mexico.,Laboratorio de Primatología, Applied Research in Experimental Biomedicine S.A. de C.V. (APREXBIO), Ciudad de México, Mexico.,Biología Integral para Vertebrados (BIOINVERT®), Unidad de Experimentación Animal, Estado de México, Mexico.,Centro Nacional de Investigación en Instrumentación e Imagenología Médica (CI3M), Universidad Autónoma Metropolitana-Unidad Iztapalapa (UAM-I), Ciudad de México, Mexico
| | - U Hernández-Arciga
- Laboratorio de Bioenergética y envejecimiento celular, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico
| | - R Toledo
- Laboratorio de Bioenergética y envejecimiento celular, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico
| | - M Königsberg
- Laboratorio de Bioenergética y envejecimiento celular, Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Ciudad de México, Mexico
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Ng CW, Navarro X, Engle JR, Recanzone GH. Age-related changes of auditory brainstem responses in nonhuman primates. J Neurophysiol 2015; 114:455-67. [PMID: 25972589 DOI: 10.1152/jn.00663.2014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 05/06/2015] [Indexed: 01/05/2023] Open
Abstract
Nonhuman primates, compared with humans and rodents, have historically been far less used for studies of age-related hearing loss, primarily because of their long life span and high cost of maintenance. Strong similarities in genetics, anatomy, and neurophysiology of the auditory nervous system between humans and monkeys, however, could provide fruitful opportunities to enhance our understanding of hearing loss. The present study used a common, noninvasive technique for testing hearing sensitivity in humans, the auditory brainstem response (ABR), to assess the hearing of 48 rhesus macaques from 6 to 35 yr of age to clicks and tone stimuli between 0.5 and 16.0 kHz. Old monkeys, particularly those above 21.5 yr of age, had missing ABR waveforms at high frequencies. Regression analyses revealed that ABR threshold increased as a function of age at peaks II and IV simultaneously. In the suprathreshold hearing condition (70 dB peak sound pressure level), ABR-based audiograms similarly varied as a function of age such that old monkeys had smaller peak amplitudes and delayed latencies at low, middle, and high frequencies. Peripheral hearing differences remained a major influence associated with age-related changes in audiometric functions of old monkeys at a comparable sensation level across animals. The present findings suggest that hearing loss occurs in old monkeys across a wide range of frequencies and that these deficits increase in severity with age. Parallel to prior studies in monkeys, we found weak effects of sex on hearing, and future investigations are necessary to clarify its role in age-related hearing loss.
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Affiliation(s)
- Chi-Wing Ng
- Center for Neuroscience, University of California, Davis, California
| | - Xochi Navarro
- Center for Neuroscience, University of California, Davis, California
| | - James R Engle
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, Arizona
| | - Gregg H Recanzone
- Center for Neuroscience, University of California, Davis, California; Department of Neurobiology, Physiology and Behavior, University of California, Davis, California
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Sanz-Fernández R, Sánchez-Rodriguez C, Granizo JJ, Durio-Calero E, Martín-Sanz E. Utility of auditory steady-state and brainstem responses in age-related hearing loss in rats. Acta Otolaryngol 2015; 135:35-41. [PMID: 25373888 DOI: 10.3109/00016489.2014.953203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONCLUSIONS The results support the idea that auditory steady-state response (ASSR) is a more accurate test for studying age-related hearing loss (ARHL) in Sprague-Dawley rats. Differences in the rat middle ear may explain the variations of the click properties, with a displacement of the energy toward the 8 and 10 kHz frequencies compared with humans. OBJECTIVES The purpose of this study was to evaluate ARHL in older and younger Sprague-Dawley rats using auditory clicks and tone burst with auditory brainstem response (ABR), in addition to ASSR. METHODS This was a prospective cohort study with 50 animals divided into 5 groups based on their age in months. A total of 100 registers were elicited from each one of the 3 auditory measurements systems in an electrically shielded, double-walled, sound-treated cabin. Nine frequencies, from 0.5 to 16 kHz were analyzed with the auditory steady-state response and compared with the results elicited by the clicks and tone-burst ABR. RESULTS Comparisons between the different frequencies showed lower thresholds in those frequencies below 2 kHz, independently of their age in months. The ARHL was detected by each one of the three auditory measurement systems, but with lower thresholds with the ASSR test. Finally, auditory clicks showed better correlations with 8 and 10 kHz elicited by ASSR, which was different to what was expected, based on human studies.
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Durand-Rivera A, Gonzalez-Pina R, Hernandez-Godinez B, Ibanez-Contreras A, Bueno-Nava A, Alfaro-Rodriguez A. Piracetam-induced changes on the brainstem auditory response in anesthetized juvenile rhesus monkeys (Macaca mulatta). Report of two clinical cases. J Med Primatol 2012; 41:336-9. [PMID: 22882117 DOI: 10.1111/j.1600-0684.2012.00561.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/11/2012] [Indexed: 11/29/2022]
Abstract
BACKGROUND We describe two clinical cases and examine the effects of piracetam on the brainstem auditory response in infantile female rhesus monkeys (Macaca mulatta). RESULTS We found that the interwave intervals show a greater reduction in a 3-year-old rhesus monkey compared to a 1-year-old rhesus monkey. DISCUSSION In this report, we discuss the significance of these observations.
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Affiliation(s)
- A Durand-Rivera
- Depto. de Neurorrehabilitacion-Laboratorio de Neuroproteccion, Instituto Nacional de Rehabilitacion, Mexico D.F, Mexico
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Fowler CG, Chiasson KB, Leslie TH, Thomas D, Beasley TM, Kemnitz JW, Weindruch R. Auditory function in rhesus monkeys: effects of aging and caloric restriction in the Wisconsin monkeys five years later. Hear Res 2010; 261:75-81. [PMID: 20079820 PMCID: PMC2855903 DOI: 10.1016/j.heares.2010.01.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2009] [Revised: 12/21/2009] [Accepted: 01/11/2010] [Indexed: 01/23/2023]
Abstract
Caloric restriction (CR) slows aging in many species and protects some animals from age-related hearing loss (ARHL), but the effect on humans is not yet known. Because rhesus monkeys are long-lived primates that are phylogenically closer to humans than other research animals are, they provide a better model for studying the effects of CR in aging and ARHL. Subjects were from the pool of 55 rhesus monkeys aged 15-28 years who had been in the Wisconsin study on CR and aging for 8-13.5 years. Distortion product otoacoustic emissions (DPOAE) with f2 frequencies from 2211 to 8837 Hz and auditory brainstem response (ABR) thresholds from clicks and 8, 16, and 32 kHz tone bursts were obtained. DPOAE levels declined linearly at approximately 1 dB/year, but that rate doubled for the highest frequencies in the oldest monkeys. There were no interactions for diet condition or sex. ABR thresholds to clicks and tone bursts showed increases with aging. Borderline significance was shown for diet in the thresholds at 8 kHz stimuli, with monkeys on caloric restriction having lower thresholds. Because the rhesus monkeys have a maximum longevity of 40 years, the full benefits of CR may not yet be realized.
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Affiliation(s)
- Cynthia G Fowler
- Department of Communicative Disorders, University of Wisconsin-Madison, 1975 Willow Drive, Madison, WI 53706, USA.
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Fowler CG, Chiasson KB, Hart DB, Beasley TM, Kemnitz J, Weindruch R. Tympanometry in rhesus monkeys: effects of aging and caloric restriction. Int J Audiol 2008; 47:209-14. [PMID: 18389417 DOI: 10.1080/14992020701851882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Caloric restriction is the only known method of increasing lifespan in laboratory animals. The present study was conducted as part of a larger investigation into the effect of caloric restriction on longevity of rhesus monkeys as a model for human aging. This study focused on the effects of caloric restriction and aging on measures of middle-ear function measured with tympanometry. Peak compensated static acoustic admittance (peak Y(tm)) tended to be reduced with aging. For tympanometric width (TW), the effect of age was significant with TW increasing with age. Males had a trend of narrower TW than females. A significant age by sex interaction indicated that TW for males stays relatively constant, whereas TW for females increases with age. The equivalent ear canal volume (V(ea)) was significantly larger in male monkeys than in female monkeys, and marginally larger for the control monkeys than for the caloric restricted monkeys. These results parallel many findings in middle-ear function in aging humans. Longitudinal studies are planned.
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Affiliation(s)
- Cynthia G Fowler
- Department of Communicative Disorders, University of Wisconsin-Madison, WI 53706, USA.
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Torre P, Mattison JA, Fowler CG, Lane MA, Roth GS, Ingram DK. Assessment of auditory function in rhesus monkeys (Macaca mulatta): effects of age and calorie restriction. Neurobiol Aging 2004; 25:945-54. [PMID: 15212848 DOI: 10.1016/j.neurobiolaging.2003.09.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2003] [Revised: 09/04/2003] [Accepted: 09/16/2003] [Indexed: 10/26/2022]
Abstract
Age-related alterations in auditory function were evaluated in adult male rhesus monkeys (Macaca mulatta) involved in a long-term study evaluating the effects of caloric restriction (CR) on aging. We assessed 26 monkeys in a control group fed a low fat, high fiber diet at approximately ad libitum levels and 24 monkeys in a CR group that were fed the same diet reduced in amount by 30% compared to age- and weight-matched controls. The following measures of auditory function were obtained while monkeys were maintained under anesthesia: (1) distortion product otoacoustic emissions (DPOAEs); (2) auditory brainstem responses (ABRs); and (3) middle latency responses (MLRs). All DPOAE measures and peak II amplitude significantly decreased with age, while peak IV latency and ABR threshold significantly increased with age. We found no significant effects of CR on any auditory parameters examined.
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Affiliation(s)
- Peter Torre
- Department of Population Health Services, University of Wisconsin-Madison, WI, USA.
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Lasky RE, Luck ML, Torre P, Laughlin N. The effects of early lead exposure on auditory function in rhesus monkeys. Neurotoxicol Teratol 2001; 23:639-49. [PMID: 11792532 DOI: 10.1016/s0892-0362(01)00175-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Thirty-one female rhesus monkeys were randomly assigned to three lead exposure conditions (none, birth to 1 year, and birth to 2 years). Blood lead levels were maintained at 35-40 microg/dl beginning shortly after birth and continuing for 1 or 2 years postnatally. Auditory function was assessed in these monkeys at least 1 year after exposure to lead. The outcome measures included tympanometry to assess middle ear function, otoacoustic emissions (OAEs) to assess cochlear function, and auditory brainstem-evoked responses (ABRs) to assess the auditory nerve and brainstem pathways. There were no significant differences among the three experimental groups for any of the tympanometric variables measured suggesting no effect of lead exposure on middle ear function. Suprathreshold and threshold distortion product OAEs (DPOAEs) were comparable among the three groups. Finally, the auditory-evoked response at levels from the auditory nerve to the cerebral cortex did not significantly differ as a function of lead exposure. The lead exposure in this study had little effect on auditory function.
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Affiliation(s)
- R E Lasky
- Center for Clinical Research and Evidence-Based Medicine, University of Texas-Houston Medical School, 6431 Fannin Street, MSB 2.106, Houston, TX 77030-1503, USA.
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