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Tröger J, Hoischen C, Perner B, Monajembashi S, Barbotin A, Löschberger A, Eggeling C, Kessels MM, Qualmann B, Hemmerich P. Comparison of Multiscale Imaging Methods for Brain Research. Cells 2020; 9:E1377. [PMID: 32492970 PMCID: PMC7349602 DOI: 10.3390/cells9061377] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 12/11/2022] Open
Abstract
A major challenge in neuroscience is how to study structural alterations in the brain. Even small changes in synaptic composition could have severe outcomes for body functions. Many neuropathological diseases are attributable to disorganization of particular synaptic proteins. Yet, to detect and comprehensively describe and evaluate such often rather subtle deviations from the normal physiological status in a detailed and quantitative manner is very challenging. Here, we have compared side-by-side several commercially available light microscopes for their suitability in visualizing synaptic components in larger parts of the brain at low resolution, at extended resolution as well as at super-resolution. Microscopic technologies included stereo, widefield, deconvolution, confocal, and super-resolution set-ups. We also analyzed the impact of adaptive optics, a motorized objective correction collar and CUDA graphics card technology on imaging quality and acquisition speed. Our observations evaluate a basic set of techniques, which allow for multi-color brain imaging from centimeter to nanometer scales. The comparative multi-modal strategy we established can be used as a guide for researchers to select the most appropriate light microscopy method in addressing specific questions in brain research, and we also give insights into recent developments such as optical aberration corrections.
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Affiliation(s)
- Jessica Tröger
- Institute of Biochemistry I, Jena University Hospital—Friedrich Schiller University Jena, Nonnenplan 2-4, 07743 Jena, Germany;
| | - Christian Hoischen
- Core Facility Imaging, Leibniz Institute on Aging – Fritz Lipmann Institute (FLI), Beutenbergstraße 11, 07745 Jena, Germany; (C.H.); (B.P.); (S.M.)
| | - Birgit Perner
- Core Facility Imaging, Leibniz Institute on Aging – Fritz Lipmann Institute (FLI), Beutenbergstraße 11, 07745 Jena, Germany; (C.H.); (B.P.); (S.M.)
- Molecular Genetics Lab, Leibniz Institute on Aging—Fritz Lipmann Institute (FLI), Beutenbergstraße 11, 07745 Jena, Germany
| | - Shamci Monajembashi
- Core Facility Imaging, Leibniz Institute on Aging – Fritz Lipmann Institute (FLI), Beutenbergstraße 11, 07745 Jena, Germany; (C.H.); (B.P.); (S.M.)
| | - Aurélien Barbotin
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX13PJ, UK;
| | - Anna Löschberger
- Advanced Development Light Microscopy, Carl Zeiss Microscopy GmbH, Carl-Zeiss-Promenade 10, 07745 Jena, Germany;
| | - Christian Eggeling
- MRC Human Immunology Unit & Wolfson Imaging Center Oxford, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX39DS, UK;
- Dep. Biophysical Imaging, Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, and Institute for Applied Optics and Biophysics, Faculty of Physics and Astronomy, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - Michael M. Kessels
- Institute of Biochemistry I, Jena University Hospital—Friedrich Schiller University Jena, Nonnenplan 2-4, 07743 Jena, Germany;
| | - Britta Qualmann
- Institute of Biochemistry I, Jena University Hospital—Friedrich Schiller University Jena, Nonnenplan 2-4, 07743 Jena, Germany;
| | - Peter Hemmerich
- Core Facility Imaging, Leibniz Institute on Aging – Fritz Lipmann Institute (FLI), Beutenbergstraße 11, 07745 Jena, Germany; (C.H.); (B.P.); (S.M.)
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52
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Persic D, Thomas ME, Pelekanos V, Ryugo DK, Takesian AE, Krumbholz K, Pyott SJ. Regulation of auditory plasticity during critical periods and following hearing loss. Hear Res 2020; 397:107976. [PMID: 32591097 PMCID: PMC8546402 DOI: 10.1016/j.heares.2020.107976] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 03/15/2020] [Accepted: 04/14/2020] [Indexed: 02/07/2023]
Abstract
Sensory input has profound effects on neuronal organization and sensory maps in the brain. The mechanisms regulating plasticity of the auditory pathway have been revealed by examining the consequences of altered auditory input during both developmental critical periods—when plasticity facilitates the optimization of neural circuits in concert with the external environment—and in adulthood—when hearing loss is linked to the generation of tinnitus. In this review, we summarize research identifying the molecular, cellular, and circuit-level mechanisms regulating neuronal organization and tonotopic map plasticity during developmental critical periods and in adulthood. These mechanisms are shared in both the juvenile and adult brain and along the length of the auditory pathway, where they serve to regulate disinhibitory networks, synaptic structure and function, as well as structural barriers to plasticity. Regulation of plasticity also involves both neuromodulatory circuits, which link plasticity with learning and attention, as well as ascending and descending auditory circuits, which link the auditory cortex and lower structures. Further work identifying the interplay of molecular and cellular mechanisms associating hearing loss-induced plasticity with tinnitus will continue to advance our understanding of this disorder and lead to new approaches to its treatment. During CPs, brain plasticity is enhanced and sensitive to acoustic experience. Enhanced plasticity can be reinstated in the adult brain following hearing loss. Molecular, cellular, and circuit-level mechanisms regulate CP and adult plasticity. Plasticity resulting from hearing loss may contribute to the emergence of tinnitus. Modifying plasticity in the adult brain may offer new treatments for tinnitus.
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Affiliation(s)
- Dora Persic
- University of Groningen, University Medical Center Groningen, Groningen, Department of Otorhinolaryngology and Head/Neck Surgery, 9713, GZ, Groningen, the Netherlands
| | - Maryse E Thomas
- Eaton-Peabody Laboratories, Massachusetts Eye & Ear and Department of Otorhinolaryngology and Head/Neck Surgery, Harvard Medical School, Boston, MA, USA
| | - Vassilis Pelekanos
- Hearing Sciences, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, University Park, Nottingham, UK
| | - David K Ryugo
- Hearing Research, Garvan Institute of Medical Research, Sydney, NSW, 2010, Australia; School of Medical Sciences, UNSW Sydney, Sydney, NSW, 2052, Australia; Department of Otolaryngology, Head, Neck & Skull Base Surgery, St Vincent's Hospital, Sydney, NSW, 2010, Australia
| | - Anne E Takesian
- Eaton-Peabody Laboratories, Massachusetts Eye & Ear and Department of Otorhinolaryngology and Head/Neck Surgery, Harvard Medical School, Boston, MA, USA
| | - Katrin Krumbholz
- Hearing Sciences, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, University Park, Nottingham, UK
| | - Sonja J Pyott
- University of Groningen, University Medical Center Groningen, Groningen, Department of Otorhinolaryngology and Head/Neck Surgery, 9713, GZ, Groningen, the Netherlands.
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53
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Cheng Y, Zhang Y, Wang F, Jia G, Zhou J, Shan Y, Sun X, Yu L, Merzenich MM, Recanzone GH, Yang L, Zhou X. Reversal of Age-Related Changes in Cortical Sound-Azimuth Selectivity with Training. Cereb Cortex 2020; 30:1768-1778. [PMID: 31504260 DOI: 10.1093/cercor/bhz201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 07/11/2019] [Accepted: 08/08/2019] [Indexed: 02/03/2023] Open
Abstract
The compromised abilities to understand speech and localize sounds are two hallmark deficits in aged individuals. Earlier studies have shown that age-related deficits in cortical neural timing, which is clearly associated with speech perception, can be partially reversed with auditory training. However, whether training can reverse aged-related cortical changes in the domain of spatial processing has never been studied. In this study, we examined cortical spatial processing in ~21-month-old rats that were trained on a sound-azimuth discrimination task. We found that animals that experienced 1 month of training displayed sharper cortical sound-azimuth tuning when compared to the age-matched untrained controls. This training-induced remodeling in spatial tuning was paralleled by increases of cortical parvalbumin-labeled inhibitory interneurons. However, no measurable changes in cortical spatial processing were recorded in age-matched animals that were passively exposed to training sounds with no task demands. These results that demonstrate the effects of training on cortical spatial domain processing in the rodent model further support the notion that age-related changes in central neural process are, due to their plastic nature, reversible. Moreover, the results offer the encouraging possibility that behavioral training might be used to attenuate declines in auditory perception, which are commonly observed in older individuals.
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Affiliation(s)
- Yuan Cheng
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Institute of Brain and Cognitive Science, New York University Shanghai, Shanghai 200062, China
| | - Yifan Zhang
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Institute of Brain and Cognitive Science, New York University Shanghai, Shanghai 200062, China
| | - Fang Wang
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Institute of Brain and Cognitive Science, New York University Shanghai, Shanghai 200062, China
| | - Guoqiang Jia
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Institute of Brain and Cognitive Science, New York University Shanghai, Shanghai 200062, China
| | - Jie Zhou
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Institute of Brain and Cognitive Science, New York University Shanghai, Shanghai 200062, China
| | - Ye Shan
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China
| | - Xinde Sun
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China
| | - Liping Yu
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China
| | | | - Gregg H Recanzone
- Center for Neuroscience and Department of Neurobiology, Physiology and Behavior, University of California at Davis, CA 95616, USA
| | - Lianfang Yang
- Department of Physical Education, Zhejiang University of Finance & Economics, Hangzhou 310018, China
| | - Xiaoming Zhou
- Key Laboratory of Brain Functional Genomics of Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, School of Life Sciences, East China Normal University, Shanghai 200062, China.,New York University-East China Normal University Institute of Brain and Cognitive Science, New York University Shanghai, Shanghai 200062, China
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54
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Ibrahim BA, Llano DA. Aging and Central Auditory Disinhibition: Is It a Reflection of Homeostatic Downregulation or Metabolic Vulnerability? Brain Sci 2019; 9:brainsci9120351. [PMID: 31805729 PMCID: PMC6955996 DOI: 10.3390/brainsci9120351] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 11/25/2019] [Accepted: 11/30/2019] [Indexed: 01/08/2023] Open
Abstract
Aging-related changes have been identified at virtually every level of the central auditory system. One of the most common findings across these nuclei is a loss of synaptic inhibition with aging, which has been proposed to be at the heart of several aging-related changes in auditory cognition, including diminished speech perception in complex environments and the presence of tinnitus. Some authors have speculated that downregulation of synaptic inhibition is a consequence of peripheral deafferentation and therefore is a homeostatic mechanism to restore excitatory/inhibitory balance. As such, disinhibition would represent a form of maladaptive plasticity. However, clinical data suggest that deafferentation-related disinhibition tends to occur primarily in the aged brain. Therefore, aging-related disinhibition may, in part, be related to the high metabolic demands of inhibitory neurons relative to their excitatory counterparts. These findings suggest that both deafferentation-related maladaptive plastic changes and aging-related metabolic factors combine to produce changes in central auditory function. Here, we explore the arguments that downregulation of inhibition may be due to homeostatic responses to diminished afferent input vs. metabolic vulnerability of inhibitory neurons in the aged brain. Understanding the relative importance of these mechanisms will be critical for the development of treatments for the underlying causes of aging-related central disinhibition.
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Affiliation(s)
- Baher A. Ibrahim
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;
| | - Daniel A. Llano
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Correspondence:
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55
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Jafari Z, Kolb BE, Mohajerani MH. Age-related hearing loss and tinnitus, dementia risk, and auditory amplification outcomes. Ageing Res Rev 2019; 56:100963. [PMID: 31557539 DOI: 10.1016/j.arr.2019.100963] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 08/20/2019] [Accepted: 09/18/2019] [Indexed: 01/07/2023]
Abstract
Age-related hearing loss (ARHL) or presbycusis, as the third leading cause of chronic disability in older adults, has been shown to be associated with predisposing cognitive impairment and dementia. Tinnitus is also a chronic auditory disorder demonstrating a growth rate with increasing age. Recent evidence stands for the link between bothersome tinnitus and impairments in various aspects of cognitive function. Both ARHL and age-related tinnitus affect mental health and contribute to developing anxiety, stress, and depression. The present review is a comprehensive multidisciplinary study on diverse interactions among ARHL, tinnitus, and cognitive decline in older adults. This review incorporates the latest evidence in prevalence and risk factors of ARHL and tinnitus, the neural substrates of tinnitus-related cognitive impairments, hypothesized mechanisms concerning the association between ARHL and increased risk of dementia, hearing amplification outcomes in cases with ARHL and cognitive decline, and preliminary findings on the link between ARHL and cognitive impairment in animal studies. Given extensive evidence that demonstrates advantages of using auditory amplification in the alleviation of hearing handicap, depression, and tinnitus, and the improvement of cognition, social communication, and quality of life, regular hearing screening programs for identification and management of midlife hearing loss and tinnitus is strongly recommended.
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56
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Quraishe S, Newman T, Anderson L. Auditory temporal acuity improves with age in the male mouse auditory thalamus: A role for perineuronal nets? J Neurosci Res 2019; 98:1780-1799. [PMID: 31562661 DOI: 10.1002/jnr.24537] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 09/13/2019] [Accepted: 09/15/2019] [Indexed: 11/09/2022]
Abstract
The ability to perceive and interpret environmental sound accurately is conserved across many species and is fundamental for understanding communication via vocalizations. Auditory acuity and temporally controlled neuronal firing underpin this ability. Deterioration in neuronal firing precision likely contributes to poorer hearing performance, yet the role of neural processing by key nuclei in the central auditory pathways is not fully understood. Here, we record from the auditory thalamus (medial geniculate body [MGB]) of young and middle-aged, normally hearing male CBA/Ca mice. We report changes in temporal processing of auditory stimuli, with neurons recorded from ventral and medial MGB subdivisions of older animals more likely to synchronize to rapid temporally varying stimuli. MGB subdivisions also showed increased probability of neuronal firing and shorter response latencies to clicks in older animals. Histological investigation of neuronal extracellular specializations, perineuronal nets (PNNs) and axonal coats, in the MGB identified greater organization of PNNs around MGB neurons and the presence of axonal coats within older animals. This supports the observation that neural responses recorded from ventral and medial MGB of older mice were more likely to synchronize to temporally varying stimuli presented at faster repetition rates than those recorded from young adult animals. These changes are observed in animals with normal hearing thresholds, confirming that neural processing differs between the MGB subdivisions and such processing is associated with age-related changes to PNNs. Understanding these age-related changes and how they occur have important implications for the design of effective therapeutic interventions to improve speech intelligibility into later life.
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Affiliation(s)
- Shmma Quraishe
- School of Biological Sciences, B85, University of Southampton, Southampton, UK
| | - Tracey Newman
- Clinical and Experimental Sciences, B85, University of Southampton, Southampton, UK
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Knipper M, Hofmeier B, Singer W, Wolpert S, Klose U, Rüttiger L. [Differentiating cochlear synaptopathies into different hearing disorders]. HNO 2019; 67:406-416. [PMID: 30963221 DOI: 10.1007/s00106-019-0660-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Due to demographic change and altered recreational behavior, a rapid increase in hearing deficits is expected in the next 20-30 years. Consequently, the risk of age-related loss of speech discrimination, tinnitus, hyperacusis, or-as recently shown-dementia, will also increase. There are increasing indications that the loss of specific hearing fibers in humans and animals is involved in various hearing disorders. This fiber loss can be caused by cochlear synaptopathy or deafferentation and does not necessarily lead to clinically measurable threshold changes. Animal experiments have shown that reduced auditory nerve activity due to acoustic trauma or aging can be centrally compensated by disproportionately elevated and faster auditory brainstem responses (ABR). The analysis of the suprathreshold amplitudes of auditory evoked brain stem potentials and their latency in combination with non-invasive imaging techniques such as magnetic resonance imaging can help to identify the central compensatory ability of subjects and to assign defined hearing deficits.
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Affiliation(s)
- M Knipper
- Universitätsklinik für Hals-Nasen-Ohren-Heilkunde, Plastische Operationen, Sektion Molekulare Hörphysiologie, Hörforschungszentrum Tübingen (THRC), Elfriede-Aulhorn-Straße 5, 72076, Tübingen, Deutschland.
| | - B Hofmeier
- Universitätsklinik für Hals-Nasen-Ohren-Heilkunde, Plastische Operationen, Sektion Molekulare Hörphysiologie, Hörforschungszentrum Tübingen (THRC), Elfriede-Aulhorn-Straße 5, 72076, Tübingen, Deutschland
| | - W Singer
- Universitätsklinik für Hals-Nasen-Ohren-Heilkunde, Plastische Operationen, Sektion Molekulare Hörphysiologie, Hörforschungszentrum Tübingen (THRC), Elfriede-Aulhorn-Straße 5, 72076, Tübingen, Deutschland
| | - S Wolpert
- Universitätsklinik für Hals-Nasen-Ohren-Heilkunde, Plastische Operationen, Sektion Molekulare Hörphysiologie, Hörforschungszentrum Tübingen (THRC), Elfriede-Aulhorn-Straße 5, 72076, Tübingen, Deutschland
| | - U Klose
- MR-Forschung, Abteilung für Diagnostische und Interventionelle Neuroradiologie, Universitätsklinikum Tübingen, Tübingen, Deutschland
| | - L Rüttiger
- Universitätsklinik für Hals-Nasen-Ohren-Heilkunde, Plastische Operationen, Sektion Molekulare Hörphysiologie, Hörforschungszentrum Tübingen (THRC), Elfriede-Aulhorn-Straße 5, 72076, Tübingen, Deutschland
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58
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Ren F, Luo J, Ma W, Xin Q, Xu L, Fan Z, Ai Y, Zhao B, Gao F, Wang H. Hearing Loss and Cognition Among Older Adults in a Han Chinese Cohort. Front Neurosci 2019; 13:632. [PMID: 31293371 PMCID: PMC6603159 DOI: 10.3389/fnins.2019.00632] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 05/31/2019] [Indexed: 11/13/2022] Open
Abstract
Presbycusis (PC) is associated with cognitive decline and incident dementia. Speech reception thresholds (SRT) are used to assess speech detection, which points toward a central component of PC. However, to the best of our knowledge, no previous study has reported the relationship between SRT and cognitive function in older adults in a Han Chinese cohort. Therefore, in this study, we investigate the association of hearing loss, indexed using pure tone average (PTA) and SRT, with cognitive function in a Han Chinese cohort using a standardized neurocognitive battery. Subjects (aged ≥60 years) with no history of psychiatric or neurological diseases were recruited. All subjects underwent a battery of neuropsychological and auditory tests. According to the PTA of the better ear, the subjects were further divided into PC and normal PTA (NP) groups. Regression analyses were performed to examine the relationship between cognitive function and hearing loss in the PC and NP groups and all subjects when controlling for age, sex, education level, diabetes, smoking, and hypertension. Cognitive function was significantly associated with PTA and SRT in all subjects. In all subjects, the correlations between non-verbal cognitive scores and SRT were stronger than those between non-verbal cognitive scores and PTA, whereas the correlations between verbal cognitive scores and PTA were stronger than those between verbal cognitive scores and SRT. Moreover, the correlations between PTA or SRT and cognitive function in the PC group were in principle stronger than those in the NP group. Our findings indicate that cognitive function is significantly associated with PTA and SRT in older adults in a Han Chinese cohort. Therefore, SRT could be an important auditory test for exploring cognitive decline in PC and could complement PTA.
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Affiliation(s)
- Fuxin Ren
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | - Jianfen Luo
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, China.,Shandong Provincial Key Laboratory of Otology, Jinan, China
| | - Wen Ma
- Department of Otolaryngology, Jinan Central Hospital, Shandong University, Jinan, China
| | - Qian Xin
- The Second Hospital of Shandong University, Jinan, China
| | - Lei Xu
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, China.,Shandong Provincial Key Laboratory of Otology, Jinan, China
| | - Zhaomin Fan
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, China.,Shandong Provincial Key Laboratory of Otology, Jinan, China
| | - Yu Ai
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, China.,Shandong Provincial Key Laboratory of Otology, Jinan, China
| | - Bin Zhao
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | - Fei Gao
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | - Haibo Wang
- Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, China.,Shandong Provincial Key Laboratory of Otology, Jinan, China
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Fischer N, Johnson Chacko L, Majerus A, Potrusil T, Riechelmann H, Schmutzhard J, Schrott-Fischer A, Glueckert R. Age-Dependent Calcium-Binding Protein Expression in the Spiral Ganglion and Hearing Performance of C57BL/6J and 129/SvJ Mice. ORL J Otorhinolaryngol Relat Spec 2019; 81:138-154. [PMID: 31170714 DOI: 10.1159/000499472] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 03/08/2019] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS Calcium-binding proteins in neurons buffer intracellular free Ca2+ ions, which interact with proteins controlling enzymatic and ion channel activity. The heterogeneous distribution of calretinin, calbindin, and parvalbumin influences calcium homeostasis, and calcium-related neuronal processes play an important role in neuronal aging and degeneration. This study evaluated age-related changes in calretinin, calbindin, and parvalbumin immune reactivity in spiral ganglion cells. METHODS A total of 16 C57BL/6J and 16 129/SvJ mice at different ages (2, 4, 7, and 12 months) were included in the study. Hearing thresholds were assessed using auditory brainstem response before inner ears were excised for further evaluation. Semiquantitative immunohistochemistry for the aforementioned calcium-binding proteins was performed at the cellular level. RESULTS The hearing thresholds of C57BL/6J and 129/SvJ mice increased significantly by 7 months of age. The average immune reactivity of calbin-din as well as the relative number of positive cells increased significantly with aging, but no significant alterations in calretinin or parvalbumin were observed. CONCLUSIONS Upregulation of calbindin could serve as a protection to compensate for functional deficits that occur with aging. Expression of both calretinin and parvalbumin seem to be stabilizing factors in murine inner ears up to the age of 12 months in C57BL/6J and 129/SvJ mice.
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Affiliation(s)
- Natalie Fischer
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria
| | - Lejo Johnson Chacko
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria
| | - Alexandra Majerus
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria
| | - Thomas Potrusil
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria
| | - Herbert Riechelmann
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria
| | - Joachim Schmutzhard
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria
| | | | - Rudolf Glueckert
- Department of Otorhinolaryngology, Medical University Innsbruck, Innsbruck, Austria.,Department of Otorhinolaryngology, Tirol Kliniken, University Clinics of Innsbruck, Innsbruck, Austria
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60
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Kommajosyula SP, Cai R, Bartlett E, Caspary DM. Top-down or bottom up: decreased stimulus salience increases responses to predictable stimuli of auditory thalamic neurons. J Physiol 2019; 597:2767-2784. [PMID: 30924931 DOI: 10.1113/jp277450] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 03/25/2019] [Indexed: 01/29/2023] Open
Abstract
KEY POINTS Temporal imprecision leads to deficits in the comprehension of signals in cluttered acoustic environments, and the elderly are shown to use cognitive resources to disambiguate these signals. To mimic ageing in young rats, we delivered sound signals that are temporally degraded, which led to temporally imprecise neural codes. Instead of adaptation to repeated stimuli, with degraded signals, there was a relative increase in firing rates, similar to that seen in aged rats. We interpret this increase with repetition as a repair mechanism for strengthening the internal representations of degraded signals by the higher-order structures. ABSTRACT To better understand speech in challenging environments, older adults increasingly use top-down cognitive and contextual resources. The medial geniculate body (MGB) integrates ascending inputs with descending predictions to dynamically gate auditory representations based on salience and context. A previous MGB single-unit study found an increased preference for predictable sinusoidal amplitude modulated (SAM) stimuli in aged rats relative to young rats. The results suggested that the age-degraded/jittered up-stream acoustic code may engender an increased preference for predictable/repeating acoustic signals, possibly reflecting increased use of top-down resources. In the present study, we recorded from units in young-adult MGB, comparing responses to standard SAM with those evoked by less salient SAM (degraded) stimuli. We hypothesized that degrading the SAM stimulus would simulate the degraded ascending acoustic code seen in the elderly, increasing the preference for predictable stimuli. Single units were recorded from clusters of advanceable tetrodes implanted above the MGB of young-adult awake rats. Less salient SAM significantly increased the preference for predictable stimuli, especially at higher modulation frequencies. Rather than adaptation, higher modulation frequencies elicited increased numbers of spikes with each successive trial/repeat of the less salient SAM. These findings are consistent with previous findings obtained in aged rats suggesting that less salient acoustic signals engage the additional use of top-down resources, as reflected by an increased preference for repeating stimuli that enhance the representation of complex environmental/communication sounds.
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Affiliation(s)
- Srinivasa P Kommajosyula
- Southern Illinois University School of Medicine, , Department of Pharmacology, Springfield, IL, USA
| | - Rui Cai
- Southern Illinois University School of Medicine, , Department of Pharmacology, Springfield, IL, USA
| | - Edward Bartlett
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA
| | - Donald M Caspary
- Southern Illinois University School of Medicine, , Department of Pharmacology, Springfield, IL, USA
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Morphological and neurochemical changes in GABAergic neurons of the aging human inferior colliculus. Hear Res 2019; 377:318-329. [PMID: 30878270 DOI: 10.1016/j.heares.2019.02.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 02/09/2019] [Accepted: 02/13/2019] [Indexed: 12/20/2022]
Abstract
It is well known that quality of hearing decreases with increasing age due to changes in the peripheral or central auditory pathway. Along with the decrease in the number of neurons the neurotransmitter profile is also affected in the various parts of the auditory system. Particularly, changes in the inhibitory neurons in the inferior colliculus (IC) are known to affect quality of hearing with aging. To date, there is no information about the status of the inhibitory neurotransmitter GABA in the human IC during aging. We have collected and processed inferior colliculi of persons aged 11-97 years at the time of death for morphometry and immunohistochemical expression of glutamic acid decarboxylase (GAD67) and parvalbumin. We used unbiased stereology to estimate the number of cresyl-violet and immunostained neurons. Quantitative real-time PCR was used to measure the relative expression of the GAD67 mRNA. We found that the number of total, GABAergic and PV-positive neurons significantly decreased with increasing age (p < 0.05). The proportion of GAD67-ir neurons to total number of neurons was also negatively associated with increasing age (p = 0.004), but there was no change observed in the proportion of PV-ir neurons relative to GABAergic neurons (p = 0.25). Further, the fold change in the levels of GAD67 mRNA was negatively correlated to age (p = 0.024). We conclude that the poorer quality of hearing with increasing age may be due to decreased expression of inhibitory neurotransmitters and the decline in the number of inhibitory neurons in the IC.
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Bouscaren N, Yildiz H, Dartois L, Vercambre MN, Boutron-Ruault MC. Decline in Instrumental Activities of Daily Living over 4-Year: The Association with Hearing, Visual and Dual Sensory Impairments among Non-Institutionalized Women. J Nutr Health Aging 2019; 23:687-693. [PMID: 31560024 DOI: 10.1007/s12603-019-1231-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OBJECTIVE Most older adults express the wish to live at home as long as possible, thus autonomy promoting measures are essential. Hearing and visual impairments are common among older people, and they have been consistently associated with functional disability. However, longitudinal data are scarce, notably regarding dual sensory impairments (both in hearing and vision). We aimed at assessing the relationship between hearing, visual, and dual sensory impairments, and subsequent decline in instrumental activities of daily living (IADL). DESIGN Longitudinal. SETTING the French E3N-elderly sub-cohort. PARTICIPANTS 4,010 community-dwelling older women born between 1925 and 1930, and free of IADL limitations in 2006. MEASUREMENTS Hearing and visual impairments were self-reported in 2006. IADLs were evaluated in 2006 and 2010. RESULTS After 4 years of follow-up, 588 women became limited in their IADLs. In logistic regression models adjusted for potential confounders, odds ratios [95% confidence interval] for developing IADL limitations were 1.18 [0.98; 1.41], 1.98 [1.26; 3.11], and 2.61 [1.50; 4.54] for hearing, visual, or both sensory impairments respectively, compared with no sensory impairment at baseline. CONCLUSION Results suggest that among autonomous older women, visual, and to a lesser extent, hearing impairment, have a short-term negative impact on their ability to perform daily activities, with some evidence of a multiplicative effect between sensory impairments. Appropriate evaluation and management of sensory impaired elderly, and more particularly those with dual impairments, may contribute to prevent disability in aging.
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Affiliation(s)
- N Bouscaren
- Marie-Christine Boutron-Ruault, Inserm U1018, Gustave Roussy, 114 rue Edouard Vaillant, Villejuif Cedex 94 805, France, +33 [142116466],
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Eckert MA, Vaden KI, Dubno JR. Age-Related Hearing Loss Associations With Changes in Brain Morphology. Trends Hear 2019; 23:2331216519857267. [PMID: 31213143 PMCID: PMC6585256 DOI: 10.1177/2331216519857267] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 03/12/2019] [Accepted: 05/09/2019] [Indexed: 12/21/2022] Open
Abstract
Age-related hearing loss has been associated with varied auditory cortex morphology in human neuroimaging studies. These findings have suggested that peripheral auditory system declines cause changes in brain morphology but could also be due to latent variables that affect the auditory periphery and brain. The current longitudinal study was designed to evaluate these explanations for pure-tone threshold and brain morphology associations. Thirty adults (mean age at Time 1 = 64.12 ± 10.32 years) were studied at two time points (average duration between visits = 2.62 ± 0.81 years). Small- to medium-effect size associations were observed between high-frequency pure-tone thresholds and auditory cortex gray matter volume at each time point. Although there were significant longitudinal changes in low- and high-frequency hearing measures and brain morphology, those longitudinal changes were not significantly correlated across participants. High-frequency hearing measures at Time 1 were significantly related to more lateral ventricle expansion, such that participants with higher measures exhibited larger increases in ventricle size. This ventricle effect was statistically independent of high-frequency hearing associations with auditory cortex morphology. Together, these results indicate that there are at least two mechanisms for associations between age-related hearing loss and brain morphology. Potential explanations for a direct hearing loss effect on brain morphology, as well as latent variables that likely affect both the inner ear and brain, are discussed.
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Affiliation(s)
- Mark A. Eckert
- Department of Otolaryngology—Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, USA
| | - Kenneth I. Vaden
- Department of Otolaryngology—Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, USA
| | - Judy R. Dubno
- Department of Otolaryngology—Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, USA
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Bialas P, Gronwald B, Roloff K, Kreutzer S, Gottschling S, Welsch K, Volk T. Pain in tones - Is it possible to hear the pain quality? A pilot trial. PATIENT EDUCATION AND COUNSELING 2019; 102:134-138. [PMID: 30131265 DOI: 10.1016/j.pec.2018.08.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 06/15/2018] [Accepted: 08/10/2018] [Indexed: 06/08/2023]
Abstract
OBJECTIVE The adequate treatment of chronic pain also calls for measuring its quality not only its intensity. For this reason, this pilot study investigated the non-verbal description of pain quality based on tones, distinguishing between nociceptive and neuropathic pain. METHODS A nociceptive and a neuropathic pain stimulus were applied to 80 chronic pain patients and 80 healthy subjects. Using a tone generator, all participants matched both pain stimuli to an appropriate tone (in Hz). The stimulus intensity was measured using the NRS-scale, and the PainDETECT questionnaire was completed. RESULTS Both groups matched a significantly higher tone to the neuropathic than to the nociceptive pain stimulus. Compared to healthy participants, chronic pain patients allocated higher tones to both pain stimuli. Higher values were also shown for the neuropathic pain stimulus, and chronic pain patients indicated an overall higher intensity of pain as healthy participants. CONCLUSIONS It is possible to differentiate pain stimuli non-verbally through tones, however, whether quality or intensity, was the key factor remains unknown. Future studies could investigate the influence of additional factors. PRACTICAL IMPLICATIONS A practical tool using tones should be developed to detect pain quality in patients - without verbal descriptions - quickly and more precisely.
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Affiliation(s)
- Patric Bialas
- Department of Anesthesiology, Intensive Care Medicine and Pain Medicine, Germany.
| | - Benjamin Gronwald
- Centre of Palliative Care and Pediatric Pain, Saarland University Medical Center, Kirrbergerstrasse 1, 66421 Homburg/Saar, Germany
| | - Kati Roloff
- Center of Emergency Medicine, Klinik Hirslanden, Witellikerstrasse 40, 8032, Zürich, Switzerland
| | - Svenja Kreutzer
- Department of Anesthesiology, Intensive Care Medicine and Pain Medicine, Germany
| | - Sven Gottschling
- Centre of Palliative Care and Pediatric Pain, Saarland University Medical Center, Kirrbergerstrasse 1, 66421 Homburg/Saar, Germany
| | - Katja Welsch
- Centre of Palliative Care and Pediatric Pain, Saarland University Medical Center, Kirrbergerstrasse 1, 66421 Homburg/Saar, Germany
| | - Thomas Volk
- Department of Anesthesiology, Intensive Care Medicine and Pain Medicine, Germany
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65
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Hao W, Wang Q, Li L, Qiao Y, Gao Z, Ni D, Shang Y. Effects of Phase-Locking Deficits on Speech Recognition in Older Adults With Presbycusis. Front Aging Neurosci 2018; 10:397. [PMID: 30574084 PMCID: PMC6291518 DOI: 10.3389/fnagi.2018.00397] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 11/19/2018] [Indexed: 12/05/2022] Open
Abstract
Objective: People with presbycusis (PC) often report difficulties in speech recognition, especially under noisy listening conditions. Investigating the PC-related changes in central representations of envelope signals and temporal fine structure (TFS) signals of speech sounds is critical for understanding the mechanism underlying the PC-related deficit in speech recognition. Frequency-following responses (FFRs) to speech stimulation can be used to examine the subcortical encoding of both envelope and TFS speech signals. This study compared FFRs to speech signals between listeners with PC and those with clinically normal hearing (NH) under either quiet or noise-masking conditions. Methods: FFRs to a 170-ms speech syllable /da/ were recorded under either a quiet or noise-masking (with a signal-to-noise ratio (SNR) of 8 dB) condition in 14 older adults with PC and 13 age-matched adults with NH. The envelope (FFRENV) and TFS (FFRTFS) components of FFRs were analyzed separately by adding and subtracting the alternative polarity responses, respectively. Speech recognition in noise was evaluated in each participant. Results: In the quiet condition, compared with the NH group, the PC group exhibited smaller F0 and H3 amplitudes and decreased stimulus-response (S-R) correlation for FFRENV but not for FFRTFS. Both the H2 and H3 amplitudes and the S-R correlation of FFRENV significantly decreased in the noise condition compared with the quiet condition in the NH group but not in the PC group. Moreover, the degree of hearing loss was correlated with noise-induced changes in FFRTFS morphology. Furthermore, the speech-in-noise (SIN) threshold was negatively correlated with the noise-induced change in H2 (for FFRENV) and the S-R correlation for FFRENV in the quiet condition. Conclusion: Audibility affects the subcortical encoding of both envelope and TFS in PC patients. The impaired ability to adjust the balance between the envelope and TFS in the noise condition may be part of the mechanism underlying PC-related deficits in speech recognition in noise. FFRs can predict SIN perception performance.
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Affiliation(s)
- Wenyang Hao
- Department of Otorhinolaryngology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Qian Wang
- Epilepsy Center, Department of Clinical Psychology, Sanbo Brain Hospital, Capital Medical University, Beijing, China
| | - Liang Li
- School of Psychological and Cognitive Sciences and Beijing Key Laboratory of Behavior and Mental Health, Speech and Hearing Research Center, Key Laboratory on Machine Perception (Ministry of Education), Peking University, Beijing, China
| | - Yufei Qiao
- Department of Otorhinolaryngology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Zhiqiang Gao
- Department of Otorhinolaryngology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Daofeng Ni
- Department of Otorhinolaryngology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yingying Shang
- Department of Otorhinolaryngology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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66
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Gillingham SM, Vallesi A, Pichora-Fuller MK, Alain C. Older Adults With Hearing Loss Have Reductions in Visual, Motor and Attentional Functioning. Front Aging Neurosci 2018; 10:351. [PMID: 30459591 PMCID: PMC6232266 DOI: 10.3389/fnagi.2018.00351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 10/16/2018] [Indexed: 01/05/2023] Open
Abstract
Evidence from epidemiological, laboratory and clinical research suggests a link between age-related auditory declines and domain-general cognitive declines. Nevertheless, few studies have experimentally compared measures of non-auditory cognitive functions in younger normal hearing adults (YN), older adults with typical hearing thresholds for their age (ONHA) and older adults with clinically significant threshold hearing loss (OHL). The current study investigated the differences between these groups on measures of attentional response selection and execution to visual stimuli. A visual reaction time (RT) paradigm involving four tasks with differing and hierarchical attentional demands was administered. RTs on trials with differing foreperiods (FPs; pre-stimulus waiting times) were analyzed to assess context-related slowing, error commission and related cognitive control and strategic and automatic neural preparatory processes. The OHL group demonstrated a general slowing that was most apparent on the simplest tasks. Although the number of errors was similar when comparing all three groups, the OHL group exhibited less control over recovery from an error compared to the younger and ONHA groups. Unlike the YN and ONHA groups, the OHL group also showed difficulties with both strategic and automatic response preparation, although automatic preparation was more affected across all tasks. This pattern of results suggests that in older adults with hearing loss there is an underlying difficulty in automatic temporal processing that can affect higher order cognitive functions, although there may not be a completely generalized decline in cognitive functioning that is associated with hearing loss.
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Affiliation(s)
- Susan M Gillingham
- Baycrest Health Sciences, Rotman Research Institute (RRI), Toronto, ON, Canada.,Department of Psychology, University of Toronto, Toronto, ON, Canada
| | - Antonino Vallesi
- Padova Neuroscience Center & Department of Neuroscience, University of Padova, Padova, Italy.,San Camillo Hospital IRCCS, Venice, Italy
| | - M Kathleen Pichora-Fuller
- Baycrest Health Sciences, Rotman Research Institute (RRI), Toronto, ON, Canada.,Department of Psychology, University of Toronto, Toronto, ON, Canada
| | - Claude Alain
- Baycrest Health Sciences, Rotman Research Institute (RRI), Toronto, ON, Canada.,Department of Psychology, University of Toronto, Toronto, ON, Canada.,Institute of Medical Sciences, University of Toronto, Toronto, ON, Canada.,Faculty of Music, University of Toronto, Toronto, ON, Canada
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67
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Ren F, Ma W, Li M, Sun H, Xin Q, Zong W, Chen W, Wang G, Gao F, Zhao B. Gray Matter Atrophy Is Associated With Cognitive Impairment in Patients With Presbycusis: A Comprehensive Morphometric Study. Front Neurosci 2018; 12:744. [PMID: 30405333 PMCID: PMC6205975 DOI: 10.3389/fnins.2018.00744] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 09/27/2018] [Indexed: 02/05/2023] Open
Abstract
Presbycusis (PC) is characterized by bilateral sensorineural hearing loss at high frequencies and speech-perception difficulties in noisy environments and has a strikingly detrimental impact on cognitive function. As the neural consequences of PC may involve the whole brain, we hypothesized that patients with PC would show structural alterations not only in the auditory cortex but also in the cortexes involved in cognitive function. The purpose of this study was to use surface-based morphometry (SBM) analysis to elucidate whole-brain structural differences between patients with PC and age-matched normal hearing controls. Three-dimensional T1-weighted MR images of 26 patients with mild PC and 26 age-, sex- and education-matched healthy controls (HCs) were acquired. All participants underwent a battery of neuropsychological tests. Our results revealed gray matter atrophy in several auditory cortical areas, nodes of the default mode network (DMN), including the bilateral precuneus and inferior parietal lobule, the right posterior cingulate cortex (PCC), and the right insula of patients with PC compared to that in the HCs. Our findings also revealed that hearing loss was associated with reduced gray matter volume in the right primary auditory cortex of patients with PC. Moreover, structural alterations in the nodes of the DMN were associated with cognitive impairments in PC patients. Additionally, this study provides evidence that a thicker right insula is associated with better speech perception in patients with PC. Based on these findings, we argue that the onset of PC seems to trigger its own cascade of conditions, including a need for increased cognitive resources during speech comprehension, which might lead to auditory and cognition-related cortical reorganization.
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Affiliation(s)
- Fuxin Ren
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | - Wen Ma
- Department of Otolaryngology, Jinan Central Hospital, Shandong University, Jinan, China
| | - Muwei Li
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States
| | - Huaiqiang Sun
- Huaxi MR Research Center, Department of Radiology, West China Hospital of Sichuan University, Chengdu, China
| | - Qian Xin
- Central Laboratory, The Second Hospital of Shandong University, Jinan, China
| | - Wei Zong
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | | | - Guangbin Wang
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | - Fei Gao
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
| | - Bin Zhao
- Shandong Medical Imaging Research Institute, Shandong University, Jinan, China
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68
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Ozmeral EJ, Eddins AC, Eddins DA. How Do Age and Hearing Loss Impact Spectral Envelope Perception? JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2018; 61:2376-2385. [PMID: 30178062 PMCID: PMC6195040 DOI: 10.1044/2018_jslhr-h-18-0056] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 05/09/2018] [Accepted: 05/16/2018] [Indexed: 06/01/2023]
Abstract
Purpose The goal was to evaluate the potential effects of increasing hearing loss and advancing age on spectral envelope perception. Method Spectral modulation detection was measured as a function of spectral modulation frequency from 0.5 to 8.0 cycles/octave. The spectral modulation task involved discrimination of a noise carrier (3 octaves wide from 400 to 3200 Hz) with a flat spectral envelope from a noise having a sinusoidal spectral envelope across a logarithmic audio frequency scale. Spectral modulation transfer functions (SMTFs; modulation threshold vs. modulation frequency) were computed and compared 4 listener groups: young normal hearing, older normal hearing, older with mild hearing loss, and older with moderate hearing loss. Estimates of the internal spectral contrast were obtained by computing excitation patterns. Results SMTFs for young listeners with normal hearing were bandpass with a minimum modulation detection threshold at 2 cycles/octave, and older listeners with normal hearing were remarkably similar to those of the young listeners. SMTFs for older listeners with mild and moderate hearing loss had a low-pass rather than a bandpass shape. Excitation patterns revealed that limited spectral resolution dictated modulation detection thresholds at high but not low spectral modulation frequencies. Even when factoring out (presumed) differences in frequency resolution among groups, the spectral envelope perception was worse for the group with moderate hearing loss than the other 3 groups. Conclusions The spectral envelope perception as measured by spectral modulation detection thresholds is compromised by hearing loss at higher spectral modulation frequencies, consistent with predictions of reduced spectral resolution known to accompany sensorineural hearing loss. Spectral envelope perception is not negatively impacted by advancing age at any spectral modulation frequency between 0.5 and 8.0 cycles/octave.
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Affiliation(s)
- Erol J. Ozmeral
- Department of Communication Sciences & Disorders, University of South Florida, Tampa
| | - Ann C. Eddins
- Department of Communication Sciences & Disorders, University of South Florida, Tampa
| | - David A. Eddins
- Department of Communication Sciences & Disorders, University of South Florida, Tampa
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69
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Recanzone G. The effects of aging on auditory cortical function. Hear Res 2018; 366:99-105. [PMID: 29853323 PMCID: PMC6103827 DOI: 10.1016/j.heares.2018.05.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 05/12/2018] [Accepted: 05/17/2018] [Indexed: 01/28/2023]
Abstract
Age-related hearing loss is a prominent deficit, afflicting approximately half of the geriatric population. In many cases, the person may have no deficits in detecting sounds, but nonetheless suffers from a reduced ability to understand speech, particularly in a noisy environment. While rodent models have shown that there are a variety of age-related changes throughout the auditory neuraxis, far fewer studies have investigated the effects at the cortical level. Here I review recent evidence from a non-human primate model of age-related hearing loss at the level of the core (primary auditory cortex, A1) and belt (caudolateral field, CL) in young and aged animals with normal detection thresholds. The findings are that there is an increase in both the spontaneous and driven activity, an increase in spatial tuning, and a reduction in the temporal fidelity of the response in aged animals. These results are consistent with an age-related imbalance of excitation and inhibition in the auditory cortex. These spatial and temporal processing deficits could underlie the major complaint of geriatrics, that it is difficult to understand speech in noise.
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Affiliation(s)
- Gregg Recanzone
- Center for Neuroscience and Department of Neurobiology, Physiology and Behavior, University of California at Davis, One Shields Avenue, Davis, CA 95616, USA.
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71
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Yang Q, Sun G, Yin H, Li H, Cao Z, Wang J, Zhou M, Wang H, Li J. PINK1 Protects Auditory Hair Cells and Spiral Ganglion Neurons from Cisplatin-induced Ototoxicity via Inducing Autophagy and Inhibiting JNK Signaling Pathway. Free Radic Biol Med 2018; 120:342-355. [PMID: 29458150 DOI: 10.1016/j.freeradbiomed.2018.02.025] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 01/25/2018] [Accepted: 02/15/2018] [Indexed: 12/23/2022]
Abstract
Phosphatase and tensin homologue (PTEN)-induced putative kinase 1 (PINK1) gene encodes a serine/threonine kinase, which acts as a molecular sensor of mitochondrial health necessary for mitochondrial quality control. The present study was designed to examine whether PINK1 expressed in C57BL/6 murine cochlea and HEI-OC1 cells and, if so, to investigate the possible mechanisms underlying the action of PINK1 in cisplatin-induced death of sensory hair cells (HCs) and spiral ganglion neurons (SGNs) in vitro. The expression pattern of PINK1, formation of parkin particles, and autophagy were determined by immunofluorescent staining. The expressions of PINK1, LC3B, cleaved-caspase 3 and p-JNK were measured by Western blotting. The levels of reactive oxygen species (ROS) were evaluated by DCFH-DA and Mito-Sox Red staining. The mitochondrial membrane potential was detected by Tetramethylrhodamine methyl ester perchlorate (TMRM) and Rhodamine 123. Cell viability and apoptosis were examined by CCK8 assay, TUNEL staining and Annexin V Apoptosis Detection Kit, respectively. We found that PINK1 was widely expressed in the cytoplasm in HCs, SGNs, stria vascularis of C57BL/6 cochlea and HEI-OC1 cells and, notably, the expression level in cochlear HCs and SGNs of postnatal day 4 (P4) mice was higher than that in adult mice. Moreover, treatment with 30 μM cisplatin elicited the formation of ROS, which, in turn, led to PINK1 activation, parkin recruitment, autophagy formation and JNK pathway relevant to apoptosis in HEI-OC1 cells, HCs, and SGNs. Meanwhile, co-treatment with ROS scavenger N-acetyl-L-cysteine (NAC) or H2O2 consumer catalase-polyethylene glycol (PEG-catalase) inhibited parkin recruitment, alleviated autophagy formation, and mitigated JNK pathway related apoptosis. In addition, PINK1 silencing resulted in a lower level of autophagy, but, a higher mortality in HEI-OC1 cells treated with cisplatin. Taken together, data from this work reveal that PINK1 possesses the protective effect via induction of autophagy and resistance of apoptosis under cisplatin stimulus in sensory HCs and SGNs, implying that PINK1 might serve as an important regulator of cisplatin-elicited ototoxicity.
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Affiliation(s)
- Qianqian Yang
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Department of Pathology and Pathophysiology, School of Medicine, Shandong University, Jinan, China
| | - Gaoying Sun
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratory of Otology, Jinan, China
| | - Haiyan Yin
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Department of Pathology and Pathophysiology, School of Medicine, Shandong University, Jinan, China
| | - Hongrui Li
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Zhixin Cao
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Jinghan Wang
- Otorhinolaryngology Department of Affiliated Eye and ENT Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China
| | - Meijuan Zhou
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratory of Otology, Jinan, China
| | - Haibo Wang
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Shandong Provincial Key Laboratory of Otology, Jinan, China.
| | - Jianfeng Li
- Otolaryngology-Head and Neck Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China; Department of Pathology and Pathophysiology, School of Medicine, Shandong University, Jinan, China; Shandong Provincial Key Laboratory of Otology, Jinan, China.
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72
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Association between speech and high-frequency hearing loss and depression, anxiety and stress in older adults. Maturitas 2018; 110:86-91. [DOI: 10.1016/j.maturitas.2018.02.002] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/25/2018] [Accepted: 02/01/2018] [Indexed: 11/22/2022]
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Chen YC, Chen H, Jiang L, Bo F, Xu JJ, Mao CN, Salvi R, Yin X, Lu G, Gu JP. Presbycusis Disrupts Spontaneous Activity Revealed by Resting-State Functional MRI. Front Behav Neurosci 2018; 12:44. [PMID: 29593512 PMCID: PMC5859072 DOI: 10.3389/fnbeh.2018.00044] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 02/26/2018] [Indexed: 12/03/2022] Open
Abstract
Purpose: Presbycusis, age-related hearing loss, is believed to involve neural changes in the central nervous system, which is associated with an increased risk of cognitive impairment. The goal of this study was to determine if presbycusis disrupted spontaneous neural activity in specific brain areas involved in auditory processing, attention and cognitive function using resting-state functional magnetic resonance imaging (fMRI) approach. Methods: Hearing and resting-state fMRI measurements were obtained from 22 presbycusis patients and 23 age-, sex- and education-matched healthy controls. To identify changes in spontaneous neural activity associated with age-related hearing loss, we compared the amplitude of low-frequency fluctuations (ALFF) and regional homogeneity (ReHo) of fMRI signals in presbycusis patients vs. controls and then determined if these changes were linked to clinical measures of presbycusis. Results: Compared with healthy controls, presbycusis patients manifested decreased spontaneous activity mainly in the superior temporal gyrus (STG), parahippocampal gyrus (PHG), precuneus and inferior parietal lobule (IPL) as well as increased neural activity in the middle frontal gyrus (MFG), cuneus and postcentral gyrus (PoCG). A significant negative correlation was observed between ALFF/ReHo activity in the STG and average hearing thresholds in presbycusis patients. Increased ALFF/ReHo activity in the MFG was positively correlated with impaired Trail-Making Test B (TMT-B) scores, indicative of impaired cognitive function involving the frontal lobe. Conclusions: Presbycusis patients have disrupted spontaneous neural activity reflected by ALFF and ReHo measurements in several brain regions; these changes are associated with specific cognitive performance and speech/language processing. These findings mainly emphasize the crucial role of aberrant resting-state ALFF/ReHo patterns in presbycusis patients and will lead to a better understanding of the neuropathological mechanisms underlying presbycusis.
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Affiliation(s)
- Yu-Chen Chen
- Department of Medical Imaging, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, China.,Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Huiyou Chen
- Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Liang Jiang
- Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Fan Bo
- Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Jin-Jing Xu
- Department of Otolaryngology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Cun-Nan Mao
- Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, State University of New York, Buffalo, NY, United States
| | - Xindao Yin
- Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Guangming Lu
- Department of Medical Imaging, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Jian-Ping Gu
- Department of Radiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
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74
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Jayakody DMP, Friedland PL, Martins RN, Sohrabi HR. Impact of Aging on the Auditory System and Related Cognitive Functions: A Narrative Review. Front Neurosci 2018; 12:125. [PMID: 29556173 PMCID: PMC5844959 DOI: 10.3389/fnins.2018.00125] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 02/15/2018] [Indexed: 12/15/2022] Open
Abstract
Age-related hearing loss (ARHL), presbycusis, is a chronic health condition that affects approximately one-third of the world's population. The peripheral and central hearing alterations associated with age-related hearing loss have a profound impact on perception of verbal and non-verbal auditory stimuli. The high prevalence of hearing loss in the older adults corresponds to the increased frequency of dementia in this population. Therefore, researchers have focused their attention on age-related central effects that occur independent of the peripheral hearing loss as well as central effects of peripheral hearing loss and its association with cognitive decline and dementia. Here we review the current evidence for the age-related changes of the peripheral and central auditory system and the relationship between hearing loss and pathological cognitive decline and dementia. Furthermore, there is a paucity of evidence on the relationship between ARHL and established biomarkers of Alzheimer's disease, as the most common cause of dementia. Such studies are critical to be able to consider any causal relationship between dementia and ARHL. While this narrative review will examine the pathophysiological alterations in both the peripheral and central auditory system and its clinical implications, the question remains unanswered whether hearing loss causes cognitive impairment or vice versa.
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Affiliation(s)
- Dona M P Jayakody
- Clinical Research, Ear Science Institute Australia, Subiaco, WA, Australia.,School of Surgery, University of Western Australia, Perth, WA, Australia
| | - Peter L Friedland
- Clinical Research, Ear Science Institute Australia, Subiaco, WA, Australia.,School of Surgery, University of Western Australia, Perth, WA, Australia.,School of Medicine, University of Notre Dame Australia, Fremantle, WA, Australia
| | - Ralph N Martins
- Biomedical Sciences, Macquarie University, Sydney, NSW, Australia.,School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
| | - Hamid R Sohrabi
- Biomedical Sciences, Macquarie University, Sydney, NSW, Australia.,School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
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75
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Henschke JU, Ohl FW, Budinger E. Crossmodal Connections of Primary Sensory Cortices Largely Vanish During Normal Aging. Front Aging Neurosci 2018; 10:52. [PMID: 29551970 PMCID: PMC5840148 DOI: 10.3389/fnagi.2018.00052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 02/15/2018] [Indexed: 11/22/2022] Open
Abstract
During aging, human response times (RTs) to unisensory and crossmodal stimuli decrease. However, the elderly benefit more from crossmodal stimulus representations than younger people. The underlying short-latency multisensory integration process is mediated by direct crossmodal connections at the level of primary sensory cortices. We investigate the age-related changes of these connections using a rodent model (Mongolian gerbil), retrograde tracer injections into the primary auditory (A1), somatosensory (S1), and visual cortex (V1), and immunohistochemistry for markers of apoptosis (Caspase-3), axonal plasticity (Growth associated protein 43, GAP 43), and a calcium-binding protein (Parvalbumin, PV). In adult animals, primary sensory cortices receive a substantial number of direct thalamic inputs from nuclei of their matched, but also from nuclei of non-matched sensory modalities. There are also direct intracortical connections among primary sensory cortices and connections with secondary sensory cortices of other modalities. In very old animals, the crossmodal connections strongly decrease in number or vanish entirely. This is likely due to a retraction of the projection neuron axonal branches rather than ongoing programmed cell death. The loss of crossmodal connections is also accompanied by changes in anatomical correlates of inhibition and excitation in the sensory thalamus and cortex. Together, the loss and restructuring of crossmodal connections during aging suggest a shift of multisensory processing from primary cortices towards other sensory brain areas in elderly individuals.
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Affiliation(s)
- Julia U Henschke
- Department Systems Physiology of Learning, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Department Genetics, Leibniz Institute for Neurobiology, Magdeburg, Germany.,German Center for Neurodegenerative Diseases within the Helmholtz Association, Magdeburg, Germany.,Institute of Cognitive Neurology and Dementia Research (IKND), Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
| | - Frank W Ohl
- Department Systems Physiology of Learning, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany.,Institute of Biology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Eike Budinger
- Department Systems Physiology of Learning, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
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76
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Lagrois MÉ, Peretz I, Zendel BR. Neurophysiological and Behavioral Differences between Older and Younger Adults When Processing Violations of Tonal Structure in Music. Front Neurosci 2018; 12:54. [PMID: 29487498 PMCID: PMC5816823 DOI: 10.3389/fnins.2018.00054] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 01/23/2018] [Indexed: 11/18/2022] Open
Abstract
Aging is associated with decline in both cognitive and auditory abilities. However, evidence suggests that music perception is relatively spared, despite relying on auditory and cognitive abilities that tend to decline with age. It is therefore likely that older adults engage compensatory mechanisms which should be evident in the underlying functional neurophysiology related to processing music. In other words, the perception of musical structure would be similar or enhanced in older compared to younger adults, while the underlying functional neurophysiology would be different. The present study aimed to compare the electrophysiological brain responses of younger and older adults to melodic incongruities during a passive and active listening task. Older and younger adults had a similar ability to detect an out-of-tune incongruity (i.e., non-chromatic), while the amplitudes of the ERAN and P600 were reduced in older adults compared to younger adults. On the other hand, out-of-key incongruities (i.e., non-diatonic), were better detected by older adults compared to younger adults, while the ERAN and P600 were comparable between the two age groups. This pattern of results indicates that perception of tonal structure is preserved in older adults, despite age-related neurophysiological changes in how melodic violations are processed.
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Affiliation(s)
- Marie-Élaine Lagrois
- International Laboratory for Brain, Music, and Sound Research, Montréal, QC, Canada.,Département de Psychologie, Université de Montréal, Montréal, QC, Canada
| | - Isabelle Peretz
- International Laboratory for Brain, Music, and Sound Research, Montréal, QC, Canada.,Département de Psychologie, Université de Montréal, Montréal, QC, Canada
| | - Benjamin Rich Zendel
- International Laboratory for Brain, Music, and Sound Research, Montréal, QC, Canada.,Faculty of Medicine, Memorial University of Newfoundland, St. John's, NL, Canada
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77
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Balogová Z, Popelář J, Chiumenti F, Chumak T, Burianová JS, Rybalko N, Syka J. Age-Related Differences in Hearing Function and Cochlear Morphology between Male and Female Fischer 344 Rats. Front Aging Neurosci 2018; 9:428. [PMID: 29354051 PMCID: PMC5758597 DOI: 10.3389/fnagi.2017.00428] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 12/13/2017] [Indexed: 12/04/2022] Open
Abstract
Fischer 344 (F344) rats represent a strain that is frequently used as a model for fast aging. In this study, we systematically compare the hearing function during aging in male and female F344 rats, by recording auditory brainstem responses (ABRs) and distortion product otoacoustic emissions (DPOAEs). In addition to this, the functional parameters are correlated with the cochlear histology. The parameters of the hearing function were not different in the young (3-month-old) male and female F344 rats; the gender differences occurred only in adult and aged animals. In 8–24-month-old males, the ABR thresholds were higher and the ABR amplitudes were smaller than those measured in females of the same age. There were no gender differences in the neural adaptation tested by recording ABRs, elicited by a series of clicks with varying inter-click interval (ICI). Amplitudes of DPOAEs in both the males and females decreased with age, but in the males, the decrease of DPOAE amplitudes was faster. In males older than 20 months, the DPOAEs were practically absent, whereas in 20–24-month-old females, the DPOAEs were still measurable. There were no gender differences in the number of surviving outer hair cells (OHC) and the number of inner hair cell ribbon synapses in aged animals. The main difference was found in the stria vascularis (SV). Whereas the SV was well preserved in females up to the age of 24 months, in most of the age-matched males the SV was evidently deteriorated. The results demonstrate more pronounced age-related changes in the cochlear morphology, hearing thresholds, ABR amplitudes and DPOAE amplitudes in F344 males compared with females.
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Affiliation(s)
- Zuzana Balogová
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czechia
| | - Jiří Popelář
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czechia
| | | | - Tetyana Chumak
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czechia
| | | | - Natalia Rybalko
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czechia
| | - Josef Syka
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czechia
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78
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Rodríguez-de la Rosa L, Lassaletta L, Calvino M, Murillo-Cuesta S, Varela-Nieto I. The Role of Insulin-Like Growth Factor 1 in the Progression of Age-Related Hearing Loss. Front Aging Neurosci 2017; 9:411. [PMID: 29311900 PMCID: PMC5733003 DOI: 10.3389/fnagi.2017.00411] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 11/27/2017] [Indexed: 12/21/2022] Open
Abstract
Aging is associated with impairment of sensorial functions and with the onset of neurodegenerative diseases. As pari passu circulating insulin-like growth factor 1 (IGF-1) bioavailability progressively decreases, we see a direct correlation with sensory impairment and cognitive performance in older humans. Age-related sensory loss is typically caused by the irreversible death of highly differentiated neurons and sensory receptor cells. Among sensory deficits, age-related hearing loss (ARHL), also named presbycusis, affects one third of the population over 65 years of age and is a major factor in the progression of cognitive problems in the elderly. The genetic and molecular bases of ARHL are largely unknown and only a few genes related to susceptibility to oxidative stress, excitotoxicity, and cell death have been identified. IGF-1 is known to be a neuroprotective agent that maintains cellular metabolism, activates growth, proliferation and differentiation, and limits cell death. Inborn IGF-1 deficiency leads to profound sensorineural hearing loss both in humans and mice. IGF-1 haploinsufficiency has also been shown to correlate with ARHL. There is not much information available on the effect of IGF-1 deficiency on other human sensory systems, but experimental models show a long-term impact on the retina. A secondary action of IGF-1 is the control of oxidative stress and inflammation, thus helping to resolve damage situations, acute or made chronic by aging. Here we will review the primary actions of IGF-1 in the auditory system and the underlying molecular mechanisms.
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Affiliation(s)
- Lourdes Rodríguez-de la Rosa
- “Alberto Sols” Biomedical Research Institute CSIC-UAM, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
| | - Luis Lassaletta
- “Alberto Sols” Biomedical Research Institute CSIC-UAM, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
- Otorhinolaryngology Department, Hospital La Paz, Madrid, Spain
| | - Miryam Calvino
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
- Otorhinolaryngology Department, Hospital La Paz, Madrid, Spain
| | - Silvia Murillo-Cuesta
- “Alberto Sols” Biomedical Research Institute CSIC-UAM, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
| | - Isabel Varela-Nieto
- “Alberto Sols” Biomedical Research Institute CSIC-UAM, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid, Spain
- Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain
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79
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Profant O, Roth J, Bureš Z, Balogová Z, Lišková I, Betka J, Syka J. Auditory dysfunction in patients with Huntington’s disease. Clin Neurophysiol 2017; 128:1946-1953. [DOI: 10.1016/j.clinph.2017.07.403] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 07/13/2017] [Accepted: 07/18/2017] [Indexed: 10/19/2022]
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80
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Fortunato S, Forli F, Guglielmi V, De Corso E, Paludetti G, Berrettini S, Fetoni AR. A review of new insights on the association between hearing loss and cognitive decline in ageing. ACTA OTORHINOLARYNGOLOGICA ITALICA 2017; 36:155-66. [PMID: 27214827 PMCID: PMC4977003 DOI: 10.14639/0392-100x-993] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 03/27/2016] [Indexed: 11/23/2022]
Abstract
Age-related hearing loss (ARHL) has a multifactorial pathogenesis and it is an inevitable hearing impairment associated with reduction of communicative skills related to ageing. Increasing evidence has linked ARHL to more rapid progression of cognitive decline and incidental dementia. Many aspects of daily living of elderly people have been associated to hearing abilities, showing that hearing loss (HL) affects the quality of life, social relationships, motor skills, psychological aspects and function and morphology in specific brain areas. Epidemiological and clinical studies confirm the assumption of a relationship between these conditions. However, the mechanisms are still unclear and are reviewed herein. Long-term hearing deprivation of auditory inputs can impact cognitive performance by decreasing the quality of communication leading to social isolation and depression and facilitate dementia. On the contrary, the limited cognitive skills may reduce the cognitive resources available for auditory perception, increasing the effects of HL. In addition, hearing loss and cognitive decline may reflect a 'common cause' on the auditory pathway and brain. In fact, some pathogenetic factors are recongised in common microvascular disease factors such as diabetes, atherosclerosis and hypertension. Interdisciplinary efforts to investigate and address HL in the context of brain and cognitive ageing are needed. Surprisingly, few studies have been adressed on the effectiveness of hearing aids in changing the natural history of cognitive decline. Effective interventions with hearing aids or cochlear implant may improve social and emotional function, communication, cognitive function and positively impact quality of life. The aim of this review is to overview new insights on this challenging topic and provide new ideas for future research.
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Affiliation(s)
- S Fortunato
- Otolaryngology Audiology and Phoniatric Unit, University of Pisa, Pisa, Italy
| | - F Forli
- Otolaryngology Audiology and Phoniatric Unit, University of Pisa, Pisa, Italy
| | - V Guglielmi
- Department of Neuroscience, Institute of Neurology, Catholic University of the Sacred Heart, Rome, Italy
| | - E De Corso
- Department of Head and Neck Surgery - Otorhinolaryngology, Catholic University of the Sacred Heart, Rome, Italy
| | - G Paludetti
- Department of Head and Neck Surgery - Otorhinolaryngology, Catholic University of the Sacred Heart, Rome, Italy
| | - S Berrettini
- Otolaryngology Audiology and Phoniatric Unit, University of Pisa, Pisa, Italy
| | - A R Fetoni
- Department of Head and Neck Surgery - Otorhinolaryngology, Catholic University of the Sacred Heart, Rome, Italy
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81
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Rozycka A, Liguz-Lecznar M. The space where aging acts: focus on the GABAergic synapse. Aging Cell 2017; 16:634-643. [PMID: 28497576 PMCID: PMC5506442 DOI: 10.1111/acel.12605] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/02/2017] [Indexed: 12/19/2022] Open
Abstract
As it was established that aging is not associated with massive neuronal loss, as was believed in the mid‐20th Century, scientific interest has addressed the influence of aging on particular neuronal subpopulations and their synaptic contacts, which constitute the substrate for neural plasticity. Inhibitory neurons represent the most complex and diverse group of neurons, showing distinct molecular and physiological characteristics and possessing a compelling ability to control the physiology of neural circuits. This review focuses on the aging of GABAergic neurons and synapses. Understanding how aging affects synapses of particular neuronal subpopulations may help explain the heterogeneity of aging‐related effects. We reviewed the literature concerning the effects of aging on the numbers of GABAergic neurons and synapses as well as aging‐related alterations in their presynaptic and postsynaptic components. Finally, we discussed the influence of those changes on the plasticity of the GABAergic system, highlighting our results concerning aging in mouse somatosensory cortex and linking them to plasticity impairments and brain disorders. We posit that aging‐induced impairments of the GABAergic system lead to an inhibitory/excitatory imbalance, thereby decreasing neuron's ability to respond with plastic changes to environmental and cellular challenges, leaving the brain more vulnerable to cognitive decline and damage by synaptopathic diseases.
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Affiliation(s)
- Aleksandra Rozycka
- Department of Molecular and Cellular Neurobiology; Nencki Institute of Experimental Biology; Polish Academy of Sciences; 3 Pasteur Street Warsaw 02-093 Poland
| | - Monika Liguz-Lecznar
- Department of Molecular and Cellular Neurobiology; Nencki Institute of Experimental Biology; Polish Academy of Sciences; 3 Pasteur Street Warsaw 02-093 Poland
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82
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Sottile SY, Ling L, Cox BC, Caspary DM. Impact of ageing on postsynaptic neuronal nicotinic neurotransmission in auditory thalamus. J Physiol 2017; 595:5375-5385. [PMID: 28585699 PMCID: PMC5538226 DOI: 10.1113/jp274467] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 05/24/2017] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Neuronal nicotinic acetylcholine receptors (nAChRs) play a fundamental role in the attentional circuitry throughout the mammalian CNS. In the present study, we report a novel finding that ageing negatively impacts nAChR efficacy in auditory thalamus, and this is probably the result of a loss of nAChR density (Bmax ) and changes in the subunit composition of nAChRs. Our data support the hypothesis that age-related maladaptive changes involving nAChRs within thalamocortical circuits partially underpin the difficulty that elderly adults experience with respect to attending to speech and other salient acoustic signals. ABSTRACT The flow of auditory information through the medial geniculate body (MGB) is regulated, in part, by cholinergic projections from the pontomesencephalic tegmentum. The functional significance of these projections is not fully established, although they have been strongly implicated in the allocation of auditory attention. Using in vitro slice recordings, we have analysed postsynaptic function and pharmacology of neuronal nicotinic ACh receptors (nAChRs) in young adult and the aged rat MGB. We find that ACh produces significant excitatory postsynaptic actions on young MGB neurons, probably mediated by β2-containing heteromeric nAChRs. Radioligand binding studies show a significant age-related loss of heteromeric nAChR receptor number, which supports patch clamp data showing an age-related loss in ACh efficacy in evoking postsynaptic responses. Use of the β2-selective nAChR antagonist, dihydro-β-erythroidine, suggests that loss of cholinergic efficacy may also be the result of an age-related subunit switch from high affinity β2-containing nAChRs to low affinity β4-containing nAChRs, in addition to the loss of total nAChR number. This age-related nAChR dysfunction may partially underpin the attentional deficits that contribute to the loss of speech understanding in the elderly.
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Affiliation(s)
| | | | - Brandon C. Cox
- Department of Pharmacology
- Department of Surgery, Division of OtolaryngologySouthern Illinois University School of MedicineSpringfieldILUSA
| | - Donald M. Caspary
- Department of Pharmacology
- Department of Surgery, Division of OtolaryngologySouthern Illinois University School of MedicineSpringfieldILUSA
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83
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Godfrey DA, Chen K, O'Toole TR, Mustapha AI. Amino acid and acetylcholine chemistry in the central auditory system of young, middle-aged and old rats. Hear Res 2017; 350:173-188. [DOI: 10.1016/j.heares.2017.05.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 04/24/2017] [Accepted: 05/03/2017] [Indexed: 02/04/2023]
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84
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Moreno-Gómez FN, Véliz G, Rojas M, Martínez C, Olmedo R, Panussis F, Dagnino-Subiabre A, Delgado C, Delano PH. Music Training and Education Slow the Deterioration of Music Perception Produced by Presbycusis in the Elderly. Front Aging Neurosci 2017; 9:149. [PMID: 28579956 PMCID: PMC5437118 DOI: 10.3389/fnagi.2017.00149] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 05/02/2017] [Indexed: 12/13/2022] Open
Abstract
The perception of music depends on the normal function of the peripheral and central auditory system. Aged subjects without hearing loss have altered music perception, including pitch and temporal features. Presbycusis or age-related hearing loss is a frequent condition in elderly people, produced by neurodegenerative processes that affect the cochlear receptor cells and brain circuits involved in auditory perception. Clinically, presbycusis patients have bilateral high-frequency hearing loss and deteriorated speech intelligibility. Music impairments in presbycusis subjects can be attributed to the normal aging processes and to presbycusis neuropathological changes. However, whether presbycusis further impairs music perception remains controversial. Here, we developed a computerized version of the Montreal battery of evaluation of amusia (MBEA) and assessed music perception in 175 Chilean adults aged between 18 and 90 years without hearing complaints and in symptomatic presbycusis patients. We give normative data for MBEA performance in a Latin-American population, showing age and educational effects. In addition, we found that symptomatic presbycusis was the most relevant factor determining global MBEA accuracy in aged subjects. Moreover, we show that melodic impairments in presbycusis individuals were diminished by music training, while the performance in temporal tasks were affected by the educational level and music training. We conclude that music training and education are important factors as they can slow the deterioration of music perception produced by age-related hearing loss.
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Affiliation(s)
- Felipe N. Moreno-Gómez
- Laboratorio de Neurobiología de la Audición, Programa de Fisiología y Biofísica, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de ChileSantiago, Chile
- Auditory and Cognition Center, AUCOSantiago, Chile
- Departamento de Biología y Química, Facultad de Ciencias Básicas, Universidad Católica del MauleTalca, Chile
| | - Guillermo Véliz
- Laboratorio de Neurobiología de la Audición, Programa de Fisiología y Biofísica, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de ChileSantiago, Chile
- Departamento de Otorrinolaringología, Hospital Clínico de la Universidad de ChileSantiago, Chile
| | - Marcos Rojas
- Laboratorio de Neurobiología de la Audición, Programa de Fisiología y Biofísica, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de ChileSantiago, Chile
- Departamento de Otorrinolaringología, Hospital Clínico de la Universidad de ChileSantiago, Chile
| | - Cristián Martínez
- Departamento de Otorrinolaringología, Hospital Clínico de la Universidad de ChileSantiago, Chile
| | - Rubén Olmedo
- Departamento de Otorrinolaringología, Hospital Clínico de la Universidad de ChileSantiago, Chile
| | - Felipe Panussis
- Departamento de Otorrinolaringología, Hospital Clínico de la Universidad de ChileSantiago, Chile
| | - Alexies Dagnino-Subiabre
- Auditory and Cognition Center, AUCOSantiago, Chile
- Laboratorio de Neurobiología del Stress, Centro de Neurobiología y Plasticidad Cerebral (CNPC), Instituto de Fisiología, Facultad de Ciencias, Universidad de ValparaísoValparaíso, Chile
| | - Carolina Delgado
- Auditory and Cognition Center, AUCOSantiago, Chile
- Departamento Neurología y Neurocirugía, Hospital Clínico de la Universidad de ChileSantiago, Chile
| | - Paul H. Delano
- Laboratorio de Neurobiología de la Audición, Programa de Fisiología y Biofísica, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de ChileSantiago, Chile
- Auditory and Cognition Center, AUCOSantiago, Chile
- Departamento de Otorrinolaringología, Hospital Clínico de la Universidad de ChileSantiago, Chile
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85
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Xia MY, Zhao XY, Huang QL, Sun HY, Sun C, Yuan J, He C, Sun Y, Huang X, Kong W, Kong WJ. Activation of Wnt/β-catenin signaling by lithium chloride attenuates d-galactose-induced neurodegeneration in the auditory cortex of a rat model of aging. FEBS Open Bio 2017; 7:759-776. [PMID: 28593132 PMCID: PMC5458451 DOI: 10.1002/2211-5463.12220] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/27/2017] [Accepted: 03/06/2017] [Indexed: 01/09/2023] Open
Abstract
Degeneration of the central auditory system, which is characterized by reduced understanding of speech and source localization of sounds, is an important cause of age‐related hearing loss (presbycusis). Accumulating evidence has demonstrated that Wnt/β‐catenin signaling plays an essential role in the development of the auditory system but its potential role in presbycusis remains unclear. In this study, we used a rat model of aging, created by chronic systemic exposure to d‐galactose (d‐gal), and explored changes in Wnt/β‐catenin signaling in the auditory cortex. A decrease in Wnt/β‐catenin signaling in the auditory cortex was found in both naturally aging and d‐gal‐mimetic aging rats, as indicated by increased GSK3β activity and decreased β‐catenin activity. Moreover, lithium chloride (Licl), an activator of Wnt signaling pathway, was administered long term to 15‐month‐old d‐gal‐treated rats. Activation of Wnt/β‐catenin signaling by Licl attenuated d‐gal‐induced auditory cortex apoptosis and neurodegeneration. Bmi1, a transcription factor implicated in antiaging and resistance to apoptosis, can be modulated by β‐catenin activity. Here, we showed that the expression of Bmi1 was reduced and the expression of its downstream genes, p16INK4a, p19Arf, and p53 were increased in the auditory cortex both of naturally aging and d‐gal‐mimetic aging rats. In addition, Licl significantly increased Bmi1 expression and reduced p16INK4a, p19Arf, and p53 expression. Our results indicated that decreased Wnt/β‐catenin signaling might participate in the pathogenesis of central presbycusis through modulating the expression of Bmi1. Wnt/β‐catenin signaling might be used as a potential therapeutic target against presbycusis.
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Affiliation(s)
- Ming-Yu Xia
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xue-Yan Zhao
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qi-Lin Huang
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hai-Ying Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chen Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jie Yuan
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chang He
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiang Huang
- Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wen Kong
- Department of Endocrinology, Union Hospital Tongji, Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei-Jia Kong
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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86
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Phenome-wide association study for CYP2A6 alleles: rs113288603 is associated with hearing loss symptoms in elderly smokers. Sci Rep 2017; 7:1034. [PMID: 28432340 PMCID: PMC5430682 DOI: 10.1038/s41598-017-01098-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 03/24/2017] [Indexed: 01/08/2023] Open
Abstract
To identify novel phenotypic associations related to Cytochrome P450 Family 2 Subfamily A Member 6 (CYP2A6), we investigated the human phenome in a total of 11,271 individuals. Initially, we conducted a phenome-wide association study in 3,401 nicotine-exposed elderly subjects considering 358 phenotypic traits. We identified a significant association between CYP2A6 rs113288603 and hearing loss symptoms (p = 5.75 × 10−5). No association was observed in a sample of 3,245 nicotine-unexposed individuals from the same discovery cohort, consistent with the conclusion that the finding is related to CYP2A6 involvement in nicotine metabolism. Consistent results were obtained (p < 0.1) in an independent sample of 2,077 nicotine-exposed elderly subjects, and similarly, no significance was observed in the nicotine-unexposed sample (n = 2,548) of the replication cohort. Additional supporting evidence for this association was provided by gene expression data: rs113288603 is associated with increased CYP2A6 expression in cerebellar hemispheres (p = 7.8 × 10−4). There is a well-known correlation between smoking and age-related hearing loss. Cigarette smoking is associated with structural changes in the brain and CYP2A6 mediates these changes. In this context, the regulatory role of rs113288603 in cerebellum appears to be consistent with the known involvement of this brain region in auditory function.
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87
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Zhang Y, Huang X, Zhao XY, Hu YJ, Sun HY, Kong WJ. Role of the Ubiquitin C-Terminal Hydrolase L1-Modulated Ubiquitin Proteasome System in Auditory Cortex Senescence. ORL J Otorhinolaryngol Relat Spec 2017; 79:153-163. [PMID: 28407635 DOI: 10.1159/000468944] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 03/06/2017] [Indexed: 12/23/2022]
Abstract
BACKGROUND/AIMS According to recent studies, central auditory impairments are closely related to neurodegenerative diseases. However, the mechanism of central presbycusis remains unclear. Ubiquitin C-terminal hydrolase L1 (UCHL1) is important in maintaining proteasomal activity; however, the detailed mechanism has not yet been fully elucidated. This study aims to investigate the molecular alterations involved in UCHL1 regulation during auditory cortex aging. METHODS D-Galactose (D-gal) induces oxidative stress and senescence in the auditory cortex, as reported in our previous studies. Primary auditory cortex cells were treated with D-gal for 72 h or 5 days. The proteins related to the ubiquitin proteasome system (UPS) and proteasomal activities were evaluated. UCHL1 was overexpressed, and the effects of UCHL1 on the UPS and proteasomal activity were analyzed. RESULTS Proteasomal activity was elevated at 72 h and decreased at 5 days in D-gal-treated primary auditory cortex cells. We also found that overexpression of UCHL1 increased the UPS-related proteins UBE1, PSMA7, ubiquitinated proteins, and monoubiquitin, and proteasomal activity. CONCLUSION The results suggest that UCHL1 may modify the aging process in the auditory cortex by regulating UPS- related proteins.
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Affiliation(s)
- Ya Zhang
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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88
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Strain GM, McGee KA. Distortion product otoacoustic emissions in young adult and geriatric cats. Vet J 2017; 221:34-37. [PMID: 28283078 DOI: 10.1016/j.tvjl.2017.01.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 01/25/2017] [Accepted: 01/30/2017] [Indexed: 12/25/2022]
Abstract
Recordings of distortion product otoacoustic emissions (DPOAEs) were taken from 15 geriatric cats (mean age ± standard deviation, SD, 13.6 ± 2.7 years; range 10.2-19.4 years) and 12 young adult control cats (mean ± SD 4.6 ± 0.5 years; range 3.4-5 years) to identify frequency-specific age-related changes in cochlear responses. Recordings were performed for primary frequencies from 2 to 12 kHz in 2 kHz increments. Cats were considered to be geriatric > 11.9 ± 1.9 years of age. Brainstem auditory evoked response (BAER) recordings were also made for subjective comparison with DPOAE responses. No differences in DPOAE response amplitudes were observed at any tested frequency in geriatric cats compared to control cats, reflecting an apparent absence of loss of cochlear outer hair cells along the length of the cochlea. No linear regression relationships were found for DPOAE response amplitude versus age in geriatric cats, despite the progressive nature of age-related hearing loss in other species. The absence of reductions in response at any of the tested frequencies in cats within the age span where cats are considered to be geriatric indicates that age-related hearing loss, if it does develop in cats, begins later in the life span of cats than in dogs or human beings.
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Affiliation(s)
- George M Strain
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Kain A McGee
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
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89
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Rigters SC, Bos D, Metselaar M, Roshchupkin GV, Baatenburg de Jong RJ, Ikram MA, Vernooij MW, Goedegebure A. Hearing Impairment Is Associated with Smaller Brain Volume in Aging. Front Aging Neurosci 2017; 9:2. [PMID: 28163683 PMCID: PMC5247429 DOI: 10.3389/fnagi.2017.00002] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 01/04/2017] [Indexed: 01/09/2023] Open
Abstract
Although recent studies show that age-related hearing impairment is associated with cerebral changes, data from a population perspective are still lacking. Therefore, we studied the relation between hearing impairment and brain volume in a large elderly cohort. From the population-based Rotterdam Study, 2,908 participants (mean age 65 years, 56% female) underwent a pure-tone audiogram to quantify hearing impairment. By performing MR imaging of the brain we quantified global and regional brain tissue volumes (total brain volume, gray matter volume, white matter (WM) volume, and lobe-specific volumes). We used multiple linear regression models, adjusting for age, sex, head size, time between hearing test and MR imaging, and relevant cognitive and cardiovascular covariates. Furthermore, we performed voxel-based morphometry to explore sub-regional differences. We found that a higher pure-tone threshold was associated with a smaller total brain volume [difference in standardized brain volume per decibel increase in hearing threshold in the age-sex adjusted model: -0.003 (95% confidence interval -0.004; -0.001)]. Specifically, WM volume was associated. Both associations were more pronounced in the lower frequencies. All associations were consistently present in all brain lobes in the lower frequencies and in most lobes in the higher frequencies, and were independent of cognitive function and cardiovascular risk factors. In voxel-based analyses we found associations of hearing impairment with smaller white volumes and some smaller and larger gray volumes, yet these were statistically non-significant. Our findings demonstrate that hearing impairment in elderly is related to smaller total brain volume, independent of cognition and cardiovascular risk factors. This mainly seems to be driven by smaller WM volume, throughout the brain.
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Affiliation(s)
- Stephanie C Rigters
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
| | - Daniel Bos
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands
| | - Mick Metselaar
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
| | | | - Robert J Baatenburg de Jong
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
| | - M Arfan Ikram
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Neurology, Erasmus University Medical CenterRotterdam, Netherlands
| | - Meike W Vernooij
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands
| | - André Goedegebure
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
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90
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Brewton DH, Kokash J, Jimenez O, Pena ER, Razak KA. Age-Related Deterioration of Perineuronal Nets in the Primary Auditory Cortex of Mice. Front Aging Neurosci 2016; 8:270. [PMID: 27877127 PMCID: PMC5099154 DOI: 10.3389/fnagi.2016.00270] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Accepted: 10/25/2016] [Indexed: 01/27/2023] Open
Abstract
Age-related changes in inhibitory neurotransmission in sensory cortex may underlie deficits in sensory function. Perineuronal nets (PNNs) are extracellular matrix components that ensheath some inhibitory neurons, particularly parvalbumin positive (PV+) interneurons. PNNs may protect PV+ cells from oxidative stress and help establish their rapid spiking properties. Although PNN expression has been well characterized during development, possible changes in aging sensory cortex have not been investigated. Here we tested the hypothesis that PNN+, PV+ and PV/PNN co-localized cell densities decline with age in the primary auditory cortex (A1). This hypothesis was tested using immunohistochemistry in two strains of mice (C57BL/6 and CBA/CaJ) with different susceptibility to age-related hearing loss and at three different age ranges (1–3, 6–8 and 14–24 months old). We report that PNN+ and PV/PNN co-localized cell densities decline significantly with age in A1 in both mouse strains. In the PNN+ cells that remain in the old group, the intensity of PNN staining is reduced in the C57 strain, but not the CBA strain. PV+ cell density also declines only in the C57, but not the CBA, mouse suggesting a potential exacerbation of age-effects by hearing loss in the PV/PNN system. Taken together, these data suggest that PNN deterioration may be a key component of altered inhibition in the aging sensory cortex, that may lead to altered synaptic function, susceptibility to oxidative stress and processing deficits.
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Affiliation(s)
- Dustin H Brewton
- Graduate Neuroscience Program, University of California Riverside, CA, USA
| | - Jamiela Kokash
- Department of Psychology, University of California Riverside, CA, USA
| | - Oliva Jimenez
- Department of Psychology, University of California Riverside, CA, USA
| | - Eloy R Pena
- Department of Psychology, University of California Riverside, CA, USA
| | - Khaleel A Razak
- Graduate Neuroscience Program, University of CaliforniaRiverside, CA, USA; Department of Psychology, University of CaliforniaRiverside, CA, USA
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91
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Distortion product otoacoustic emissions in geriatric dogs. Vet J 2016; 216:101-6. [DOI: 10.1016/j.tvjl.2016.07.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 05/30/2016] [Accepted: 07/17/2016] [Indexed: 01/22/2023]
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92
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Möhrle D, Ni K, Varakina K, Bing D, Lee SC, Zimmermann U, Knipper M, Rüttiger L. Loss of auditory sensitivity from inner hair cell synaptopathy can be centrally compensated in the young but not old brain. Neurobiol Aging 2016; 44:173-184. [DOI: 10.1016/j.neurobiolaging.2016.05.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 04/28/2016] [Accepted: 05/01/2016] [Indexed: 11/30/2022]
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93
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Cardin V. Effects of Aging and Adult-Onset Hearing Loss on Cortical Auditory Regions. Front Neurosci 2016; 10:199. [PMID: 27242405 PMCID: PMC4862970 DOI: 10.3389/fnins.2016.00199] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 04/22/2016] [Indexed: 11/13/2022] Open
Abstract
Hearing loss is a common feature in human aging. It has been argued that dysfunctions in central processing are important contributing factors to hearing loss during older age. Aging also has well documented consequences for neural structure and function, but it is not clear how these effects interact with those that arise as a consequence of hearing loss. This paper reviews the effects of aging and adult-onset hearing loss in the structure and function of cortical auditory regions. The evidence reviewed suggests that aging and hearing loss result in atrophy of cortical auditory regions and stronger engagement of networks involved in the detection of salient events, adaptive control and re-allocation of attention. These cortical mechanisms are engaged during listening in effortful conditions in normal hearing individuals. Therefore, as a consequence of aging and hearing loss, all listening becomes effortful and cognitive load is constantly high, reducing the amount of available cognitive resources. This constant effortful listening and reduced cognitive spare capacity could be what accelerates cognitive decline in older adults with hearing loss.
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Affiliation(s)
- Velia Cardin
- Department of Experimental Psychology, Deafness, Cognition and Language Research Centre, University College LondonLondon, UK; Department of Behavioural Sciences and Learning, Linnaeus Centre HEAD, Swedish Institute for Disability Research, Linköping UniversityLinköping, Sweden
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94
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95
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Ross B, Fujioka T. 40-Hz oscillations underlying perceptual binding in young and older adults. Psychophysiology 2016; 53:974-90. [PMID: 27080577 DOI: 10.1111/psyp.12654] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 03/12/2016] [Accepted: 03/13/2016] [Indexed: 11/29/2022]
Abstract
Auditory object perception requires binding of elementary features of complex stimuli. Synchronization of high-frequency oscillation in neural networks has been proposed as an effective alternative to binding via hard-wired connections because binding in an oscillatory network can be dynamically adjusted to the ever-changing sensory environment. Previously, we demonstrated in young adults that gamma oscillations are critical for sensory integration and found that they were affected by concurrent noise. Here, we aimed to support the hypothesis that stimulus evoked auditory 40-Hz responses are a component of thalamocortical gamma oscillations and examined whether this oscillatory system may become less effective in aging. In young and older adults, we recorded neuromagnetic 40-Hz oscillations, elicited by monaural amplitude-modulated sound. Comparing responses in quiet and under contralateral masking with multitalker babble noise revealed two functionally distinct components of auditory 40-Hz responses. The first component followed changes in the auditory input with high fidelity and was of similar amplitude in young and older adults. The second, significantly smaller in older adults, showed a 200-ms interval of amplitude and phase rebound and was strongly attenuated by contralateral noise. The amplitude of the second component was correlated with behavioral speech-in-noise performance. Concurrent noise also reduced the P2 wave of auditory evoked responses at 200-ms latency, but not the earlier N1 wave. P2 modulation was reduced in older adults. The results support the model of sensory binding through thalamocortical gamma oscillations. Limitation of neural resources for this process in older adults may contribute to their speech-in-noise understanding deficits.
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Affiliation(s)
- Bernhard Ross
- Rotman Research Institute, Baycrest Centre, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Takako Fujioka
- Center for Computer Research in Music and Acoustics, Department of Music, Stanford University, Stanford, California, USA.,Neurosciences Institute, Stanford University, Stanford, California, USA
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96
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Levy-Tzedek S, Maidenbaum S, Amedi A, Lackner J. Aging and Sensory Substitution in a Virtual Navigation Task. PLoS One 2016; 11:e0151593. [PMID: 27007812 PMCID: PMC4805187 DOI: 10.1371/journal.pone.0151593] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 03/01/2016] [Indexed: 11/21/2022] Open
Abstract
Virtual environments are becoming ubiquitous, and used in a variety of contexts–from entertainment to training and rehabilitation. Recently, technology for making them more accessible to blind or visually impaired users has been developed, by using sound to represent visual information. The ability of older individuals to interpret these cues has not yet been studied. In this experiment, we studied the effects of age and sensory modality (visual or auditory) on navigation through a virtual maze. We added a layer of complexity by conducting the experiment in a rotating room, in order to test the effect of the spatial bias induced by the rotation on performance. Results from 29 participants showed that with the auditory cues, it took participants a longer time to complete the mazes, they took a longer path length through the maze, they paused more, and had more collisions with the walls, compared to navigation with the visual cues. The older group took a longer time to complete the mazes, they paused more, and had more collisions with the walls, compared to the younger group. There was no effect of room rotation on the performance, nor were there any significant interactions among age, feedback modality and room rotation. We conclude that there is a decline in performance with age, and that while navigation with auditory cues is possible even at an old age, it presents more challenges than visual navigation.
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Affiliation(s)
- S. Levy-Tzedek
- Recanati School for Community Health Professions, Department of Physical Therapy, Ben Gurion University of the Negev, Beer-Sheva, Israel
- Zlotowski Center for Neuroscience, Ben Gurion University of the Negev, Beer-Sheva, Israel
- * E-mail:
| | - S. Maidenbaum
- Department of Medical Neurobiology, Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - A. Amedi
- Department of Medical Neurobiology, Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Cognitive Science, Faculty of Humanities, Hebrew University of Jerusalem, Jerusalem, Israel
- Sorbonne Universités UPMC Univ Paris 06, Institut de la Vision, Paris, France
| | - J. Lackner
- Ashton Graybiel Spatial Orientation Laboratory, Department of Physiology, Brandeis University, Waltham, Massachusetts, United States of America
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97
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Bahng J, Lee J. Hearing Thresholds for a Geriatric Population Composed of Korean Males and Females. J Audiol Otol 2015; 19:91-6. [PMID: 26413575 PMCID: PMC4582456 DOI: 10.7874/jao.2015.19.2.91] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 06/20/2015] [Accepted: 08/19/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The purpose of the present study was to provide the hearing threshold levels in the elderly Korean population, and to compare Korean data with that in the International Organization for Standardization (ISO) 7029 (2000). SUBJECTS AND METHODS Data were collected from a total of 526 ears from 112 males and 151 females aged 60-84 years. All participants were screened otologically by the procedure given in ISO 8253-1 (2010). RESULTS Results showed that the pure-tone average was gradually elevated with increasing age. The amount of hearing loss was greater in males than in females, and the high frequency hearing thresholds were worse than the low frequency hearing thresholds in males and females. The hearing threshold levels were higher at low frequencies in males and at all frequencies in females than the norms of ISO 7029 (2000). CONCLUSIONS Results from this study will be partly used for standardization of hearing thresholds as a function of age in Korea and for updating the ISO 7029.
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Affiliation(s)
- Junghwa Bahng
- Department of Audiology, Hallym University of Graduate Studies, Seoul, Korea
| | - Junghak Lee
- Department of Audiology, Hallym University of Graduate Studies, Seoul, Korea
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98
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Wong ACY, Ryan AF. Mechanisms of sensorineural cell damage, death and survival in the cochlea. Front Aging Neurosci 2015; 7:58. [PMID: 25954196 PMCID: PMC4404918 DOI: 10.3389/fnagi.2015.00058] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 04/05/2015] [Indexed: 12/20/2022] Open
Abstract
The majority of acquired hearing loss, including presbycusis, is caused by irreversible damage to the sensorineural tissues of the cochlea. This article reviews the intracellular mechanisms that contribute to sensorineural damage in the cochlea, as well as the survival signaling pathways that can provide endogenous protection and tissue rescue. These data have primarily been generated in hearing loss not directly related to age. However, there is evidence that similar mechanisms operate in presbycusis. Moreover, accumulation of damage from other causes can contribute to age-related hearing loss (ARHL). Potential therapeutic interventions to balance opposing but interconnected cell damage and survival pathways, such as antioxidants, anti-apoptotics, and pro-inflammatory cytokine inhibitors, are also discussed.
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Affiliation(s)
- Ann C Y Wong
- Department of Surgery/Division of Otolaryngology, University of California, San Diego School of Medicine La Jolla, CA, USA ; Department of Physiology and Translational Neuroscience Facility, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Allen F Ryan
- Department of Surgery/Division of Otolaryngology, University of California, San Diego School of Medicine La Jolla, CA, USA ; Veterans Administration Medical Center La Jolla, CA, USA ; Department of Neurosciences, University of California, San Diego School of Medicine La Jolla, CA, USA
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