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Petley L, Blankenship C, Hunter LL, Stewart HJ, Lin L, Moore DR. Amplitude Modulation Perception and Cortical Evoked Potentials in Children With Listening Difficulties and Their Typically Developing Peers. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2024; 67:633-656. [PMID: 38241680 PMCID: PMC11000788 DOI: 10.1044/2023_jslhr-23-00317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 09/01/2023] [Accepted: 11/09/2023] [Indexed: 01/21/2024]
Abstract
PURPOSE Amplitude modulations (AMs) are important for speech intelligibility, and deficits in speech intelligibility are a leading source of impairment in childhood listening difficulties (LiD). The present study aimed to explore the relationships between AM perception and speech-in-noise (SiN) comprehension in children and to determine whether deficits in AM processing contribute to childhood LiD. Evoked responses were used to parse the neural origins of AM processing. METHOD Forty-one children with LiD and 44 typically developing children, ages 8-16 years, participated in the study. Behavioral AM depth thresholds were measured at 4 and 40 Hz. SiN tasks included the Listening in Spatialized Noise-Sentences Test (LiSN-S) and a coordinate response measure (CRM)-based task. Evoked responses were obtained during an AM change detection task using alternations between 4 and 40 Hz, including the N1 of the acoustic change complex, auditory steady-state response (ASSR), P300, and a late positive response (late potential [LP]). Maturational effects were explored via age correlations. RESULTS Age correlated with 4-Hz AM thresholds, CRM separated talker scores, and N1 amplitude. Age-normed LiSN-S scores obtained without spatial or talker cues correlated with age-corrected 4-Hz AM thresholds and area under the LP curve. CRM separated talker scores correlated with AM thresholds and area under the LP curve. Most behavioral measures of AM perception correlated with the signal-to-noise ratio and phase coherence of the 40-Hz ASSR. AM change response time also correlated with area under the LP curve. Children with LiD exhibited deficits with respect to 4-Hz thresholds, AM change accuracy, and area under the LP curve. CONCLUSIONS The observed relationships between AM perception and SiN performance extend the evidence that modulation perception is important for understanding SiN in childhood. In line with this finding, children with LiD demonstrated poorer performance on some measures of AM perception, but their evoked responses implicated a primarily cognitive deficit. SUPPLEMENTAL MATERIAL https://doi.org/10.23641/asha.25009103.
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Affiliation(s)
- Lauren Petley
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center, OH
- Patient Services Research, Cincinnati Children's Hospital Medical Center, OH
- Department of Psychology, Clarkson University, Potsdam, NY
| | - Chelsea Blankenship
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center, OH
- Patient Services Research, Cincinnati Children's Hospital Medical Center, OH
| | - Lisa L. Hunter
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center, OH
- Patient Services Research, Cincinnati Children's Hospital Medical Center, OH
- Department of Otolaryngology, College of Medicine, University of Cincinnati, OH
- Department of Communication Sciences and Disorders, College of Allied Health Sciences, University of Cincinnati, OH
| | | | - Li Lin
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center, OH
- Patient Services Research, Cincinnati Children's Hospital Medical Center, OH
| | - David R. Moore
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center, OH
- Patient Services Research, Cincinnati Children's Hospital Medical Center, OH
- Department of Otolaryngology, College of Medicine, University of Cincinnati, OH
- Manchester Centre for Audiology and Deafness, The University of Manchester, United Kingdom
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Han JH, Lee J, Lee HJ. The effect of noise on the cortical activity patterns of speech processing in adults with single-sided deafness. Front Neurol 2023; 14:1054105. [PMID: 37006498 PMCID: PMC10060629 DOI: 10.3389/fneur.2023.1054105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 02/27/2023] [Indexed: 03/18/2023] Open
Abstract
The most common complaint in people with single-sided deafness (SSD) is difficulty in understanding speech in a noisy environment. Moreover, the neural mechanism of speech-in-noise (SiN) perception in SSD individuals is still poorly understood. In this study, we measured the cortical activity in SSD participants during a SiN task to compare with a speech-in-quiet (SiQ) task. Dipole source analysis revealed left hemispheric dominance in both left- and right-sided SSD group. Contrary to SiN listening, this hemispheric difference was not found during SiQ listening in either group. In addition, cortical activation in the right-sided SSD individuals was independent of the location of sound whereas activation sites in the left-sided SSD group were altered by the sound location. Examining the neural-behavioral relationship revealed that N1 activation is associated with the duration of deafness and the SiN perception ability of individuals with SSD. Our findings indicate that SiN listening is processed differently in the brains of left and right SSD individuals.
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Affiliation(s)
- Ji-Hye Han
- Laboratory of Brain and Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang, Republic of Korea
- Ear and Interaction Center, Doheun Institute for Digital Innovation in Medicine (D.I.D.I.M.), Hallym University Medical Center, Anyang, Republic of Korea
| | - Jihyun Lee
- Laboratory of Brain and Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang, Republic of Korea
- Ear and Interaction Center, Doheun Institute for Digital Innovation in Medicine (D.I.D.I.M.), Hallym University Medical Center, Anyang, Republic of Korea
| | - Hyo-Jeong Lee
- Laboratory of Brain and Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang, Republic of Korea
- Ear and Interaction Center, Doheun Institute for Digital Innovation in Medicine (D.I.D.I.M.), Hallym University Medical Center, Anyang, Republic of Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University College of Medicine, Chuncheon, Republic of Korea
- *Correspondence: Hyo-Jeong Lee
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Guérit F, Harland AJ, Richardson ML, Gransier R, Middlebrooks JC, Wouters J, Carlyon RP. Electrophysiological and Psychophysical Measures of Temporal Pitch Sensitivity in Normal-hearing Listeners. J Assoc Res Otolaryngol 2023; 24:47-65. [PMID: 36471208 PMCID: PMC9971391 DOI: 10.1007/s10162-022-00879-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Accepted: 11/17/2022] [Indexed: 12/12/2022] Open
Abstract
To obtain combined behavioural and electrophysiological measures of pitch perception, we presented harmonic complexes, bandpass filtered to contain only high-numbered harmonics, to normal-hearing listeners. These stimuli resemble bandlimited pulse trains and convey pitch using a purely temporal code. A core set of conditions consisted of six stimuli with baseline pulse rates of 94, 188 and 280 pps, filtered into a HIGH (3365-4755 Hz) or VHIGH (7800-10,800 Hz) region, alternating with a 36% higher pulse rate. Brainstem and cortical processing were measured using the frequency following response (FFR) and auditory change complex (ACC), respectively. Behavioural rate change difference limens (DLs) were measured by requiring participants to discriminate between a stimulus that changed rate twice (up-down or down-up) during its 750-ms presentation from a constant-rate pulse train. FFRs revealed robust brainstem phase locking whose amplitude decreased with increasing rate. Moderate-sized but reliable ACCs were obtained in response to changes in purely temporal pitch and, like the psychophysical DLs, did not depend consistently on the direction of rate change or on the pulse rate for baseline rates between 94 and 280 pps. ACCs were larger and DLs lower for stimuli in the HIGH than in the VHGH region. We argue that the ACC may be a useful surrogate for behavioural measures of rate discrimination, both for normal-hearing listeners and for cochlear-implant users. We also showed that rate DLs increased markedly when the baseline rate was reduced to 48 pps, and compared the behavioural and electrophysiological findings to recent cat data obtained with similar stimuli and methods.
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Affiliation(s)
- François Guérit
- Cambridge Hearing Group, MRC Cognition & Brain Sciences Unit, University of Cambridge, Cambridge, England
| | - Andrew J Harland
- Cambridge Hearing Group, MRC Cognition & Brain Sciences Unit, University of Cambridge, Cambridge, England
| | - Matthew L Richardson
- Department of Otolaryngology, University of California at Irvine, Irvine, CA, USA
| | | | - John C Middlebrooks
- Department of Otolaryngology, University of California at Irvine, Irvine, CA, USA
- Department of Neurobiology and Behavior, University of California at Irvine, Irvine, CA, USA
- Department of Cognitive Sciences, University o f California at Irvine, Irvine, CA, USA
- Department of Biomedical Engineering, University of California at Irvine, Irvine, CA, USA
| | - Jan Wouters
- Department of Neurosciences, ExpORL, Leuven, Belgium
| | - Robert P Carlyon
- Cambridge Hearing Group, MRC Cognition & Brain Sciences Unit, University of Cambridge, Cambridge, England.
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Calcus A, Undurraga JA, Vickers D. Simultaneous subcortical and cortical electrophysiological recordings of spectro-temporal processing in humans. Front Neurol 2022; 13:928158. [PMID: 35989907 PMCID: PMC9381701 DOI: 10.3389/fneur.2022.928158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 07/13/2022] [Indexed: 02/02/2023] Open
Abstract
Objective assessment of auditory discrimination has often been measured using the Auditory Change Complex (ACC), which is a cortically generated potential elicited by a change occurring within an ongoing, long-duration auditory stimulus. In cochlear implant users, the electrically-evoked ACC has been used to measure electrode discrimination by changing the stimulating electrode during stimulus presentation. In addition to this cortical component, subcortical measures provide further information about early auditory processing in both normal hearing listeners and cochlear implant users. In particular, the frequency-following response (FFR) is thought to reflect the auditory encoding at the level of the brainstem. Interestingly, recent research suggests that it is possible to simultaneously measure both subcortical and cortical physiological activity. The aim of this research was twofold: first, to understand the scope for simultaneously recording both the FFR (subcortical) and ACC (cortical) responses in normal hearing adults. Second, to determine the best recording parameters for optimizing the simultaneous capture of both responses with clinical applications in mind. Electrophysiological responses were recorded in 10 normally-hearing adults while they listened to 16-second-long pure tone sequences. The carrier frequency of these sequences was either steady or alternating periodically throughout the sequence, generating an ACC response to each alternation-the alternating ACC paradigm. In the "alternating" sequences, both the alternating rate and the carrier frequency varied parametrically. We investigated three alternating rates (1, 2.5, and 6.5 Hz) and seven frequency pairs covering the low-, mid-, and high-frequency range, including narrow and wide frequency separations. Our results indicate that both the slowest (1 Hz) and medium (2.5 Hz) alternation rates led to significant FFR and ACC responses in most frequency ranges tested. Low carrier frequencies led to larger FFR amplitudes, larger P1 amplitudes, and N1-P2 amplitude difference at slow alternation rates. No significant relationship was found between subcortical and cortical response amplitudes, in line with different generators and processing levels across the auditory pathway. Overall, the alternating ACC paradigm can be used to measure sub-cortical and cortical responses as indicators of auditory early neural encoding (FFR) and sound discrimination (ACC) in the pathway, and these are best obtained at slow alternation rates (1 Hz) in the low-frequency range (300-1200 Hz).
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Affiliation(s)
- Axelle Calcus
- Department of Speech, Hearing and Phonetic Sciences, University College London, London, United Kingdom,Laboratoire des Systèmes Perceptifs, Département d'Etudes Cognitives, Ecole Normale Supérieure, PSL University, CNRS, Paris, France,Center for Research in Cognitive Neuroscience, Université Libre de Bruxelles (ULB), Brussels, Belgium,*Correspondence: Axelle Calcus
| | - Jaime A. Undurraga
- Department of Linguistics, Macquarie University, Sydney, NSW, Australia,Interacoustics Research Unit, Technical University of Denmark, Lyngby, Denmark
| | - Deborah Vickers
- Department of Speech, Hearing and Phonetic Sciences, University College London, London, United Kingdom,SOUND Lab, Cambridge Hearing Group, Department of Clinical Neurosciences, Herchel Smith Building for Brain and Mind Sciences, Cambridge, United Kingdom
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Richardson ML, Guérit F, Gransier R, Wouters J, Carlyon RP, Middlebrooks JC. Temporal Pitch Sensitivity in an Animal Model: Psychophysics and Scalp Recordings : Temporal Pitch Sensitivity in Cat. J Assoc Res Otolaryngol 2022; 23:491-512. [PMID: 35668206 PMCID: PMC9437162 DOI: 10.1007/s10162-022-00849-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 04/11/2022] [Indexed: 01/28/2023] Open
Abstract
Cochlear implant (CI) users show limited sensitivity to the temporal pitch conveyed by electric stimulation, contributing to impaired perception of music and of speech in noise. Neurophysiological studies in cats suggest that this limitation is due, in part, to poor transmission of the temporal fine structure (TFS) by the brainstem pathways that are activated by electrical cochlear stimulation. It remains unknown, however, how that neural limit might influence perception in the same animal model. For that reason, we developed non-invasive psychophysical and electrophysiological measures of temporal (i.e., non-spectral) pitch processing in the cat. Normal-hearing (NH) cats were presented with acoustic pulse trains consisting of band-limited harmonic complexes that simulated CI stimulation of the basal cochlea while removing cochlear place-of-excitation cues. In the psychophysical procedure, trained cats detected changes from a base pulse rate to a higher pulse rate. In the scalp-recording procedure, the cortical-evoked acoustic change complex (ACC) and brainstem-generated frequency following response (FFR) were recorded simultaneously in sedated cats for pulse trains that alternated between the base and higher rates. The range of perceptual sensitivity to temporal pitch broadly resembled that of humans but was shifted to somewhat higher rates. The ACC largely paralleled these perceptual patterns, validating its use as an objective measure of temporal pitch sensitivity. The phase-locked FFR, in contrast, showed strong brainstem encoding for all tested pulse rates. These measures demonstrate the cat's perceptual sensitivity to pitch in the absence of cochlear-place cues and may be valuable for evaluating neural mechanisms of temporal pitch perception in the feline animal model of stimulation by a CI or novel auditory prostheses.
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Affiliation(s)
- Matthew L Richardson
- Department of Otolaryngology, Center for Hearing Research, University of California at Irvine, Irvine, CA, USA.
| | - François Guérit
- Cambridge Hearing Group, MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, UK
| | - Robin Gransier
- Department of Neurosciences, ExpORL, KU Leuven, Leuven, Belgium
| | - Jan Wouters
- Department of Neurosciences, ExpORL, KU Leuven, Leuven, Belgium
| | - Robert P Carlyon
- Cambridge Hearing Group, MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, UK
| | - John C Middlebrooks
- Department of Otolaryngology, Center for Hearing Research, University of California at Irvine, Irvine, CA, USA
- Departments of Neurobiology & Behavior, Biomedical Engineering, Cognitive Sciences, University of California at Irvine, Irvine, CA, USA
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Fan ZT, Zhao ZH, Sharma M, Valderrama JT, Fu QJ, Liu JX, Fu X, Li H, Zhao XL, Guo XY, Fu LY, Wang NY, Zhang J. Acoustic Change Complex Evoked by Horizontal Sound Location Change in Young Adults With Normal Hearing. Front Neurosci 2022; 16:908989. [PMID: 35733932 PMCID: PMC9207405 DOI: 10.3389/fnins.2022.908989] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 05/10/2022] [Indexed: 11/13/2022] Open
Abstract
Acoustic change complex (ACC) is a cortical auditory-evoked potential induced by a change of continuous sound stimulation. This study aimed to explore: (1) whether the change of horizontal sound location can elicit ACC; (2) the relationship between the change of sound location and the amplitude or latency of ACC; (3) the relationship between the behavioral measure of localization, minimum audible angle (MAA), and ACC. A total of 36 normal-hearing adults participated in this study. A 180° horizontal arc-shaped bracket with a 1.2 m radius was set in a sound field where participants sat at the center. MAA was measured in a two-alternative forced-choice setting. The objective electroencephalography recording of ACC was conducted with the location changed at four sets of positions, ±45°, ±15°, ±5°, and ±2°. The test stimulus was a 125–6,000 Hz broadband noise of 1 s at 60 ± 2 dB SPL with a 2 s interval. The N1′–P2′ amplitudes, N1′ latencies, and P2′ latencies of ACC under four positions were evaluated. The influence of electrode sites and the direction of sound position change on ACC waveform was analyzed with analysis of variance. Results suggested that (1) ACC can be elicited successfully by changing the horizontal sound location position. The elicitation rate of ACC increased with the increase of location change. (2) N1′–P2′ amplitude increased and N1′ and P2′ latencies decreased as the change of sound location increased. The effects of test angles on N1′–P2′ amplitude [F(1.91,238.1) = 97.172, p < 0.001], N1′ latency [F(1.78,221.90) = 96.96, p < 0.001], and P2′ latency [F(1.87,233.11) = 79.97, p < 0.001] showed a statistical significance. (3) The direction of sound location change had no significant effect on any of the ACC peak amplitudes or latencies. (4) Sound location discrimination threshold by the ACC test (97.0% elicitation rate at ±5°) was higher than MAA threshold (2.08 ± 0.5°). The current study results show that though the ACC thresholds are higher than the behavioral thresholds on MAA task, ACC can be used as an objective method to evaluate sound localization ability. This article discusses the implications of this research for clinical practice and evaluation of localization skills, especially for children.
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Affiliation(s)
- Zhi-Tong Fan
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Zi-Hui Zhao
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Mridula Sharma
- Department of Linguistics, Faculty of Human Sciences, Macquarie University, Sydney, NSW, Australia
| | - Joaquin T. Valderrama
- Department of Linguistics, Faculty of Human Sciences, Macquarie University, Sydney, NSW, Australia
- National Acoustic Laboratories, Sydney, NSW, Australia
| | - Qian-Jie Fu
- Department of Head and Neck Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Jia-Xing Liu
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Xin Fu
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Huan Li
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Xue-Lei Zhao
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Xin-Yu Guo
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Luo-Yi Fu
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Ning-Yu Wang
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
| | - Juan Zhang
- Department of Otolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
- *Correspondence: Juan Zhang,
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Anderson CA, Cushing SL, Papsin BC, Gordon KA. Cortical imbalance following delayed restoration of bilateral hearing in deaf adolescents. Hum Brain Mapp 2022; 43:3662-3679. [PMID: 35429083 PMCID: PMC9294307 DOI: 10.1002/hbm.25875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 03/24/2022] [Accepted: 04/03/2022] [Indexed: 11/10/2022] Open
Abstract
Unilateral auditory deprivation in early childhood can lead to cortical strengthening of inputs from the stimulated side, yet the impact of this on bilateral processing when inputs are later restored beyond an early sensitive period is unknown. To address this, we conducted a longitudinal study with 13 bilaterally profoundly deaf adolescents who received unilateral access to sound via a cochlear implant (CI) in their right ear in early childhood before receiving bilateral access to sound a decade later via a second CI in their left ear. Auditory‐evoked cortical responses to unilateral and bilateral stimulation were measured repeatedly using electroencephalogram from 1 week to 14 months after activation of their second CI. Early cortical responses from the newly implanted ear and bilateral stimulation were atypically lateralized to the left ipsilateral auditory cortex. Duration of unilateral deafness predicted an unexpectedly stronger representation of inputs from the newly implanted, compared to the first implanted ear, in left auditory cortex. Significant initial reductions in responses were observed, yet a left‐hemisphere bias and unequal weighting of inputs favoring the long‐term deaf ear did not converge to a balanced state observed in the binaurally developed system. Bilateral response enhancement was significantly reduced in left auditory cortex suggesting deficits in ipsilateral response inhibition of new, dominant, inputs during bilateral processing. These findings paradoxically demonstrate the adaptive capacity of the adolescent auditory system beyond an early sensitive period for bilateral input, as well as restrictions on its potential to fully reverse cortical imbalances driven by long‐term unilateral deafness.
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Affiliation(s)
- Carly A. Anderson
- Archie's Cochlear Implant Laboratory The Hospital for Sick Children Toronto Ontario Canada
- Neurosciences and Mental Health, SickKids Research Institute Toronto Ontario Canada
| | - Sharon L. Cushing
- Department of Otolaryngology—Head and Neck Surgery The Hospital for Sick Children Toronto Ontario Canada
- Department of Otolaryngology—Head and Neck Surgery University of Toronto Toronto Ontario Canada
| | - Blake C. Papsin
- Department of Otolaryngology—Head and Neck Surgery The Hospital for Sick Children Toronto Ontario Canada
- Department of Otolaryngology—Head and Neck Surgery University of Toronto Toronto Ontario Canada
| | - Karen A. Gordon
- Archie's Cochlear Implant Laboratory The Hospital for Sick Children Toronto Ontario Canada
- Neurosciences and Mental Health, SickKids Research Institute Toronto Ontario Canada
- Department of Otolaryngology—Head and Neck Surgery The Hospital for Sick Children Toronto Ontario Canada
- Department of Otolaryngology—Head and Neck Surgery University of Toronto Toronto Ontario Canada
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Han JH, Lee J, Lee HJ. Ear-Specific Hemispheric Asymmetry in Unilateral Deafness Revealed by Auditory Cortical Activity. Front Neurosci 2021; 15:698718. [PMID: 34393711 PMCID: PMC8363420 DOI: 10.3389/fnins.2021.698718] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/12/2021] [Indexed: 12/14/2022] Open
Abstract
Profound unilateral deafness reduces the ability to localize sounds achieved via binaural hearing. Furthermore, unilateral deafness promotes a substantial change in cortical processing to binaural stimulation, thereby leading to reorganization over the whole brain. Although distinct patterns in the hemispheric laterality depending on the side and duration of deafness have been suggested, the neurological mechanisms underlying the difference in relation to behavioral performance when detecting spatially varied cues remain unknown. To elucidate the mechanism, we compared N1/P2 auditory cortical activities and the pattern of hemispheric asymmetry of normal hearing, unilaterally deaf (UD), and simulated acute unilateral hearing loss groups while passively listening to speech sounds delivered from different locations under open free field condition. The behavioral performances of the participants concerning sound localization were measured by detecting sound sources in the azimuth plane. The results reveal a delayed reaction time in the right-sided UD (RUD) group for the sound localization task and prolonged P2 latency compared to the left-sided UD (LUD) group. Moreover, the RUD group showed adaptive cortical reorganization evidenced by increased responses in the hemisphere ipsilateral to the intact ear for individuals with better sound localization whereas left-sided unilateral deafness caused contralateral dominance in activity from the hearing ear. The brain dynamics of right-sided unilateral deafness indicate greater capability of adaptive change to compensate for impairment in spatial hearing. In addition, cortical N1 responses to spatially varied speech sounds in unilateral deaf people were inversely related to the duration of deafness in the area encompassing the right auditory cortex, indicating that early intervention would be needed to protect from maladaptation of the central auditory system following unilateral deafness.
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Affiliation(s)
- Ji-Hye Han
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang-si, South Korea
| | - Jihyun Lee
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang-si, South Korea
| | - Hyo-Jeong Lee
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang-si, South Korea.,Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University College of Medicine, Chuncheon-si, South Korea
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Yoon YS, Boren CM, Diaz B. Effect of Realistic Test Conditions on Spectral and Temporal Processing in Normal-Hearing Listeners. Am J Audiol 2021; 30:160-169. [PMID: 33621127 DOI: 10.1044/2020_aja-20-00120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Purpose To measure the effect of testing conditions (in the soundproof booth vs. quiet room), test order, and number of test sessions on spectral and temporal processing in normal-hearing (NH) listeners. Method Thirty-two adult NH listeners participated in the three experiments. For all three experiments, the stimuli were presented to the left ear at the subjects' most comfortable level through headphones. All tests were administered in an adaptive three-alternative forced-choice paradigm. Experiment 1 was designed to compare the effect of soundproof booth and quiet room test conditions on amplitude modulation detection threshold and modulation frequency discrimination threshold with each of the five modulation frequencies. Experiment 2 was designed to compare the effect of two test orders on the frequency discrimination thresholds under the quiet room test conditions. The thresholds were first measured in the ascending and descending order of four pure tones, and then with counterbalanced order. For Experiment 3, the amplitude discrimination threshold under the quiet room testing condition was assessed 3 times to determine the effect of the number of test sessions. Then the thresholds were compared over the sessions. Results Results showed no significant effect of test environment. The test order is an important variable for frequency discrimination, particularly between piano tunes and pure tones. Results also show no significant difference across test sessions. Conclusions These results suggest that a controlled test environment may not be required in spectral and temporal assessment for NH listeners. Under the quiet test environment, a single outcome measure is sufficient, but test orders should be counterbalanced.
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Affiliation(s)
- Yang-Soo Yoon
- Department of Communication Sciences and Disorders, Baylor University, Waco, TX
| | | | - Brianna Diaz
- Department of Speech, Language and Hearing Sciences, Texas Tech University Health Sciences Center, Lubbock
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Undurraga JA, Van Yper L, Bance M, McAlpine D, Vickers D. Neural encoding of spectro-temporal cues at slow and near speech-rate in cochlear implant users. Hear Res 2020; 403:108160. [PMID: 33461048 DOI: 10.1016/j.heares.2020.108160] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 12/17/2020] [Accepted: 12/21/2020] [Indexed: 10/22/2022]
Abstract
The ability to process rapid modulations in the spectro-temporal structure of sounds is critical for speech comprehension. For users of cochlear implants (CIs), spectral cues in speech are conveyed by differential stimulation of electrode contacts along the cochlea, and temporal cues in terms of the amplitude of stimulating electrical pulses, which track the amplitude-modulated (AM'ed) envelope of speech sounds. Whilst survival of inner-ear neurons and spread of electrical current are known factors that limit the representation of speech information in CI listeners, limitations in the neural representation of dynamic spectro-temporal cues common to speech are also likely to play a role. We assessed the ability of CI listeners to process spectro-temporal cues varying at rates typically present in human speech. Employing an auditory change complex (ACC) paradigm, and a slow (0.5Hz) alternating rate between stimulating electrodes, or different AM frequencies, to evoke a transient cortical ACC, we demonstrate that CI listeners-like normal-hearing listeners-are sensitive to transitions in the spectral- and temporal-domain. However, CI listeners showed impaired cortical responses when either spectral or temporal cues were alternated at faster, speech-like (6-7Hz), rates. Specifically, auditory change following responses-reliably obtained in normal-hearing listeners-were small or absent in CI users, indicating that cortical adaptation to alternating cues at speech-like rates is stronger under electrical stimulation. In CI listeners, temporal processing was also influenced by the polarity-behaviourally-and rate of presentation of electrical pulses-both neurally and behaviorally. Limitations in the ability to process dynamic spectro-temporal cues will likely impact speech comprehension in CI users.
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Affiliation(s)
- Jaime A Undurraga
- Department of Linguistics, 16 University Avenue, Macquarie University, NSW 2109, Australia.
| | - Lindsey Van Yper
- Department of Linguistics, 16 University Avenue, Macquarie University, NSW 2109, Australia
| | - Manohar Bance
- Cambridge Hearing Group, Department of Clinical Neurosciences, Cambridge Biomedical Campus, University of Cambridge, CB2 0QQ, UK
| | - David McAlpine
- Department of Linguistics, 16 University Avenue, Macquarie University, NSW 2109, Australia
| | - Deborah Vickers
- Cambridge Hearing Group, Department of Clinical Neurosciences, Cambridge Biomedical Campus, University of Cambridge, CB2 0QQ, UK
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11
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Coding of consonant-vowel transition in children with central auditory processing disorder: an electrophysiological study. Eur Arch Otorhinolaryngol 2020; 278:3673-3681. [PMID: 33052460 DOI: 10.1007/s00405-020-06425-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 10/05/2020] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Acoustic change complex (ACC) is an important tool to investigate the encoding of the acoustic property of speech signals in various populations. However, there is a limited number of research papers that have explored the usefulness of ACC as a tool to study the neural encoding of consonant-vowel (CV) transition in children with central auditory processing disorder (CAPD). Thus, the present study aims to investigate the utility of ACC as an objective tool to study the neural representation of consonant-vowel (CV) transition in children with CAPD. METHODS Twenty children diagnosed having CAPD and 20 normal counterparts in the age range of 8-14 years were the participants. The ACC was acquired using naturally produced CV syllable /sa/ with a duration of 380 ms. RESULTS Latency of N1' and P2' was found to be prolonged in children with CAPD compared to normal counterparts, whereas the amplitude of N1' and P2' did not show any significant difference. Scalp topography showed significantly different activation patterns for children with and without CAPD. CONCLUSION Prolonged latencies of ACC indicated poor encoding of CV transition in children with CAPD. The difference in scalp topography might be because of the involvement of additional brain areas for the neural discrimination task in children with CAPD.
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12
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Kumar P, Singh NK, Sanju HK, Kaverappa GM. Feasibility of objective assessment of difference limen for intensity using acoustic change complex in children with central auditory processing disorder. Int J Pediatr Otorhinolaryngol 2020; 137:110189. [PMID: 32682166 DOI: 10.1016/j.ijporl.2020.110189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 06/09/2020] [Accepted: 06/10/2020] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Acoustic change complex (ACC) shows brain's ability to discriminate between acoustic features in an ongoing stimulus. It is this nature of ACC that has generated interest in studying the usefulness of ACC as an objective tool for evaluating difference limens for various stimulus parameters. The present study therefore aimed at investigating the utility of ACC as an objective measure of difference limen for intensity (DLI) in normal hearing children with and without (C)APD. METHODS Fifteen children with (C)APD and 15 normal hearing children in whom (C)APD was ruled out (comparison group) in the age range of 8-12 years underwent ACC for 6 intensity differences (+1, +3, +4, +5, +10 & +20 dB) and a standard stimulus using a 1000 Hz stimulus. RESULTS Behavioral DLI (DLIb) as well as DLI found using ACC (DLIo) were both significantly larger in children with (C)APD than the comparison group (p < 0.05). Further, there was a significantly strong positive correlation between DLIb and DLIo (p < 0.001]. CONCLUSION Outcome of the study provides evidence for the clinical use of ACC as an objective tool for examining DLI in children with (C)APD.
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Affiliation(s)
- Prawin Kumar
- Department of Audiology, All India Institute of Speech and Hearing, Mysore, India
| | - Niraj Kumar Singh
- Department of Audiology, All India Institute of Speech and Hearing, Mysore, India
| | - Himanshu Kumar Sanju
- Department of ENT and Audiology, Shri Jagdamba Charitable Eye Hospital, Sri Ganganagar, Rajasthan, India.
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13
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Gransier R, Carlyon RP, Wouters J. Electrophysiological assessment of temporal envelope processing in cochlear implant users. Sci Rep 2020; 10:15406. [PMID: 32958791 PMCID: PMC7506023 DOI: 10.1038/s41598-020-72235-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 08/18/2020] [Indexed: 11/12/2022] Open
Abstract
Cochlear-implant (CI) users rely on temporal envelope modulations (TEMs) to understand speech, and clinical outcomes depend on the accuracy with which these TEMs are encoded by the electrically-stimulated neural ensembles. Non-invasive EEG measures of this encoding could help clinicians identify and disable electrodes that evoke poor neural responses so as to improve CI outcomes. However, recording EEG during CI stimulation reveals huge stimulation artifacts that are up to orders of magnitude larger than the neural response. Here we used a custom-built EEG system having an exceptionally high sample rate to accurately measure the artefact, which we then removed using linear interpolation so as to reveal the neural response during continuous electrical stimulation. In ten adult CI users, we measured the 40-Hz electrically evoked auditory steady-state response (eASSR) and electrically evoked auditory change complex (eACC) to amplitude-modulated 900-pulses-per-second pulse trains, stimulated in monopolar mode (i.e. the clinical default), and at different modulation depths. We successfully measured artifact-free 40-Hz eASSRs and eACCs. Moreover, we found that the 40-Hz eASSR, in contrast to the eACC, showed substantial responses even at shallow modulation depths. We argue that the 40-Hz eASSR is a clinically feasible objective measure to assess TEM encoding in CI users.
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Affiliation(s)
- Robin Gransier
- Department of Neurosciences, KU Leuven, ExpORL, Herestraat 49, Box 721, 3000, Leuven, Belgium.
| | - Robert P Carlyon
- Cambridge Hearing Group, MRC Cognition and Brain Sciences Unit, University of Cambridge, 15 Chaucer Road, Cambridge, CB2 7EF, UK
| | - Jan Wouters
- Department of Neurosciences, KU Leuven, ExpORL, Herestraat 49, Box 721, 3000, Leuven, Belgium
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14
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Lee J, Han JH, Lee HJ. Long-Term Musical Training Alters Auditory Cortical Activity to the Frequency Change. Front Hum Neurosci 2020; 14:329. [PMID: 32973478 PMCID: PMC7471721 DOI: 10.3389/fnhum.2020.00329] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/24/2020] [Indexed: 11/13/2022] Open
Abstract
Objective: The ability to detect frequency variation is a fundamental skill necessary for speech perception. It is known that musical expertise is associated with a range of auditory perceptual skills, including discriminating frequency change, which suggests the neural encoding of spectral features can be enhanced by musical training. In this study, we measured auditory cortical responses to frequency change in musicians to examine the relationships between N1/P2 responses and behavioral performance/musical training. Methods: Behavioral and electrophysiological data were obtained from professional musicians and age-matched non-musician participants. Behavioral data included frequency discrimination detection thresholds for no threshold-equalizing noise (TEN), +5, 0, and -5 signal-to-noise ratio settings. Auditory-evoked responses were measured using a 64-channel electroencephalogram (EEG) system in response to frequency changes in ongoing pure tones consisting of 250 and 4,000 Hz, and the magnitudes of frequency change were 10%, 25% or 50% from the base frequencies. N1 and P2 amplitudes and latencies as well as dipole source activation in the left and right hemispheres were measured for each condition. Results: Compared to the non-musician group, behavioral thresholds in the musician group were lower for frequency discrimination in quiet conditions only. The scalp-recorded N1 amplitudes were modulated as a function of frequency change. P2 amplitudes in the musician group were larger than in the non-musician group. Dipole source analysis showed that P2 dipole activity to frequency changes was lateralized to the right hemisphere, with greater activity in the musician group regardless of the hemisphere side. Additionally, N1 amplitudes to frequency changes were positively related to behavioral thresholds for frequency discrimination while enhanced P2 amplitudes were associated with a longer duration of musical training. Conclusions: Our results demonstrate that auditory cortical potentials evoked by frequency change are related to behavioral thresholds for frequency discrimination in musicians. Larger P2 amplitudes in musicians compared to non-musicians reflects musical training-induced neural plasticity.
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Affiliation(s)
- Jihyun Lee
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang, South Korea
| | - Ji-Hye Han
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang, South Korea
| | - Hyo-Jeong Lee
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Anyang, South Korea.,Department of Otorhinolaryngology, College of Medicine, Hallym University, Anyang, South Korea
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15
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Paul BT, Uzelac M, Chan E, Dimitrijevic A. Poor early cortical differentiation of speech predicts perceptual difficulties of severely hearing-impaired listeners in multi-talker environments. Sci Rep 2020; 10:6141. [PMID: 32273536 PMCID: PMC7145807 DOI: 10.1038/s41598-020-63103-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 03/24/2020] [Indexed: 11/23/2022] Open
Abstract
Hearing impairment disrupts processes of selective attention that help listeners attend to one sound source over competing sounds in the environment. Hearing prostheses (hearing aids and cochlear implants, CIs), do not fully remedy these issues. In normal hearing, mechanisms of selective attention arise through the facilitation and suppression of neural activity that represents sound sources. However, it is unclear how hearing impairment affects these neural processes, which is key to understanding why listening difficulty remains. Here, severely-impaired listeners treated with a CI, and age-matched normal-hearing controls, attended to one of two identical but spatially separated talkers while multichannel EEG was recorded. Whereas neural representations of attended and ignored speech were differentiated at early (~ 150 ms) cortical processing stages in controls, differentiation of talker representations only occurred later (~250 ms) in CI users. CI users, but not controls, also showed evidence for spatial suppression of the ignored talker through lateralized alpha (7-14 Hz) oscillations. However, CI users' perceptual performance was only predicted by early-stage talker differentiation. We conclude that multi-talker listening difficulty remains for impaired listeners due to deficits in early-stage separation of cortical speech representations, despite neural evidence that they use spatial information to guide selective attention.
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Affiliation(s)
- Brandon T Paul
- Evaluative Clinical Sciences Platform, Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada.
- Otolaryngology-Head and Neck Surgery, Sunnybrook Health Sciences Centre, Toronto, ON, M4N 3M5, Canada.
| | - Mila Uzelac
- Evaluative Clinical Sciences Platform, Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada
| | - Emmanuel Chan
- Evaluative Clinical Sciences Platform, Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada
| | - Andrew Dimitrijevic
- Evaluative Clinical Sciences Platform, Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada.
- Otolaryngology-Head and Neck Surgery, Sunnybrook Health Sciences Centre, Toronto, ON, M4N 3M5, Canada.
- Faculty of Medicine, Otolaryngology-Head and Neck Surgery, University of Toronto, Toronto, ON, M5S 1A1, Canada.
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16
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Han JH, Dimitrijevic A. Acoustic Change Responses to Amplitude Modulation in Cochlear Implant Users: Relationships to Speech Perception. Front Neurosci 2020; 14:124. [PMID: 32132897 PMCID: PMC7040081 DOI: 10.3389/fnins.2020.00124] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 01/31/2020] [Indexed: 11/13/2022] Open
Abstract
Objectives The ability to understand speech is highly variable in people with cochlear implants (CIs) and to date, there are no objective measures that identify the root of this discrepancy. However, behavioral measures of temporal processing such as the temporal modulation transfer function (TMTF) has previously found to be related to vowel and consonant identification in CI users. The acoustic change complex (ACC) is a cortical auditory-evoked potential response that can be elicited by a “change” in an ongoing stimulus. In this study, the ACC elicited by amplitude modulation (AM) change was related to measures of speech perception as well as the amplitude detection threshold in CI users. Methods Ten CI users (mean age: 50 years old) participated in this study. All subjects participated in behavioral tests that included both speech and amplitude modulation detection to obtain a TMTF. CI users were categorized as “good” (n = 6) or “poor” (n = 4) based on their speech-in noise score (<50%). 64-channel electroencephalographic recordings were conducted while CI users passively listened to AM change sounds that were presented in a free field setting. The AM change stimulus was white noise with four different AM rates (4, 40, 100, and 300 Hz). Results Behavioral results show that AM detection thresholds in CI users were higher compared to the normal-hearing (NH) group for all AM rates. The electrophysiological data suggest that N1 responses were significantly decreased in amplitude and their latencies were increased in CI users compared to NH controls. In addition, the N1 latencies for the poor CI performers were delayed compared to the good CI performers. The N1 latency for 40 Hz AM was correlated with various speech perception measures. Conclusion Our data suggest that the ACC to AM change provides an objective index of speech perception abilities that can be used to explain some of the variation in speech perception observed among CI users.
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Affiliation(s)
- Ji-Hye Han
- Communication Sciences Research Center, Cincinnati Childs Hospital Medical Center, Cincinnati, OH, United States.,Laboratory of Brain & Cognitive Sciences for Convergence Medicine, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Andrew Dimitrijevic
- Communication Sciences Research Center, Cincinnati Childs Hospital Medical Center, Cincinnati, OH, United States.,Department Otolaryngology-Head and Neck Surgery, Sunnybrook Health Sciences Centre, Faculty of Medicine, University of Toronto, Toronto, ON, Canada
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17
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Dimitrijevic A, Smith ML, Kadis DS, Moore DR. Neural indices of listening effort in noisy environments. Sci Rep 2019; 9:11278. [PMID: 31375712 PMCID: PMC6677804 DOI: 10.1038/s41598-019-47643-1] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 07/15/2019] [Indexed: 11/09/2022] Open
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18
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Presacco A, Middlebrooks JC. Tone-Evoked Acoustic Change Complex (ACC) Recorded in a Sedated Animal Model. J Assoc Res Otolaryngol 2018; 19:451-466. [PMID: 29749573 DOI: 10.1007/s10162-018-0673-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 04/24/2018] [Indexed: 11/30/2022] Open
Abstract
The acoustic change complex (ACC) is a scalp-recorded cortical evoked potential complex generated in response to changes (e.g., frequency, amplitude) in an auditory stimulus. The ACC has been well studied in humans, but to our knowledge, no animal model has been evaluated. In particular, it was not known whether the ACC could be recorded under the conditions of sedation that likely would be necessary for recordings from animals. For that reason, we tested the feasibility of recording ACC from sedated cats in response to changes of frequency and amplitude of pure-tone stimuli. Cats were sedated with ketamine and acepromazine, and subdermal needle electrodes were used to record electroencephalographic (EEG) activity. Tones were presented from a small loudspeaker located near the right ear. Continuous tones alternated at 500-ms intervals between two frequencies or two levels. Neurometric functions were created by recording neural response amplitudes while systematically varying the magnitude of steps in frequency centered in octave frequency around 2, 4, 8, and 16 kHz, all at 75 dB SPL, or in decibel level around 75 dB SPL tested at 4 and 8 kHz. The ACC could be recorded readily under this ketamine/azepromazine sedation. In contrast, ACC could not be recorded reliably under any level of isoflurane anesthesia that was tested. The minimum frequency (expressed as Weber fractions (df/f)) or level steps (expressed in dB) needed to elicit ACC fell in the range of previous thresholds reported in animal psychophysical tests of discrimination. The success in recording ACC in sedated animals suggests that the ACC will be a useful tool for evaluation of other aspects of auditory acuity in normal hearing and, presumably, in electrical cochlear stimulation, especially for novel stimulation modes that are not yet feasible in humans.
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Affiliation(s)
- Alessandro Presacco
- Department of Otolaryngology, University of California at Irvine, Irvine, CA, 92697-5310, USA.
- Center for Hearing Research, University of California at Irvine, Irvine, CA, USA.
| | - John C Middlebrooks
- Department of Otolaryngology, University of California at Irvine, Irvine, CA, 92697-5310, USA
- Center for Hearing Research, University of California at Irvine, Irvine, CA, USA
- Department of Neurobiology and Behavior, University of California at Irvine, Irvine, CA, USA
- Department of Cognitive Sciences, University of California at Irvine, Irvine, CA, USA
- Department of Biomedical Engineering, University of California at Irvine, Irvine, CA, USA
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19
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Marchina S, Norton A, Kumar S, Schlaug G. The Effect of Speech Repetition Rate on Neural Activation in Healthy Adults: Implications for Treatment of Aphasia and Other Fluency Disorders. Front Hum Neurosci 2018; 12:69. [PMID: 29535619 PMCID: PMC5835070 DOI: 10.3389/fnhum.2018.00069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 02/07/2018] [Indexed: 11/13/2022] Open
Abstract
Functional imaging studies have provided insight into the effect of rate on production of syllables, pseudowords, and naturalistic speech, but the influence of rate on repetition of commonly-used words/phrases suitable for therapeutic use merits closer examination. Aim: To identify speech-motor regions responsive to rate and test the hypothesis that those regions would provide greater support as rates increase, we used an overt speech repetition task and functional magnetic resonance imaging (fMRI) to capture rate-modulated activation within speech-motor regions and determine whether modulations occur linearly and/or show hemispheric preference. Methods: Twelve healthy, right-handed adults participated in an fMRI task requiring overt repetition of commonly-used words/phrases at rates of 1, 2, and 3 syllables/second (syll./sec.). Results: Across all rates, bilateral activation was found both in ventral portions of primary sensorimotor cortex and middle and superior temporal regions. A repeated measures analysis of variance with pairwise comparisons revealed an overall difference between rates in temporal lobe regions of interest (ROIs) bilaterally (p < 0.001); all six comparisons reached significance (p < 0.05). Five of the six were highly significant (p < 0.008), while the left-hemisphere 2- vs. 3-syll./sec. comparison, though still significant, was less robust (p = 0.037). Temporal ROI mean beta-values increased linearly across the three rates bilaterally. Significant rate effects observed in the temporal lobes were slightly more pronounced in the right-hemisphere. No significant overall rate differences were seen in sensorimotor ROIs, nor was there a clear hemispheric effect. Conclusion: Linear effects in superior temporal ROIs suggest that sensory feedback corresponds directly to task demands. The lesser degree of significance in left-hemisphere activation at the faster, closer-to-normal rate may represent an increase in neural efficiency (and therefore, decreased demand) when the task so closely approximates a highly-practiced function. The presence of significant bilateral activation during overt repetition of words/phrases at all three rates suggests that repetition-based speech production may draw support from either or both hemispheres. This bihemispheric redundancy in regions associated with speech-motor control and their sensitivity to changes in rate may play an important role in interventions for nonfluent aphasia and other fluency disorders, particularly when right-hemisphere structures are the sole remaining pathway for production of meaningful speech.
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Affiliation(s)
- Sarah Marchina
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Andrea Norton
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Sandeep Kumar
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Gottfried Schlaug
- Music, Stroke Recovery, and Neuroimaging Laboratories, Department of Neurology, Harvard Medical School, Harvard University, Boston, MA, United States
- Beth Israel Deaconess Medical Center, Boston, MA, United States
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20
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Waechter SM, Lopez Valdes A, Simoes-Franklin C, Viani L, Reilly RB. Depth matters - Towards finding an objective neurophysiological measure of behavioral amplitude modulation detection based on neural threshold determination. Hear Res 2017; 359:13-22. [PMID: 29291949 DOI: 10.1016/j.heares.2017.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 12/07/2017] [Accepted: 12/11/2017] [Indexed: 11/29/2022]
Abstract
With increasing numbers undergoing intervention for hearing impairment at a young age, the clinical need for objective assessment tools of auditory discrimination abilities is growing. Amplitude modulation (AM) sensitivity has been known to be an important factor for speech recognition particularly among cochlear implant (CI) users. It therefore would be useful to develop objective measures of AM detection for future clinical assessment of CI users; this study aimed to verify the feasibility of a neurophysiological approach studying a cohort of normal-hearing participants. The mismatch waveform (MMW) was evaluated as a potential objective measure of AM detection for a low modulation rate (8 Hz). This study also explored the relationship between behavioral AM detection and speech-in-noise recognition. The following measures were obtained for 15 young adults with no known hearing impairment: (1) psychoacoustic sinusoidal AM detection ability for a modulation rate of 8 Hz; (2) neural AM detection thresholds estimated from morphology weighted cortical auditory evoked potentials elicited to various AM depths; and (3) AzBio sentence scores for speech-in-noise recognition. No significant correlations were found between speech recognition and behavioral AM detection measures. Individual neural thresholds were obtained from MMW data and showed significant positive correlations with behavioral AM detection thresholds. Neural thresholds estimated from morphology weighted MMWs provide a novel, objective approach for assessing low-rate AM detection. The findings of this study encourage the continued investigation of the MMW as a neural correlate of low-rate AM detection in larger normal-hearing cohorts and subsequently in clinical cohorts such as cochlear implant users.
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Affiliation(s)
- Saskia M Waechter
- Trinity Centre for Bioengineering, Trinity College, The University of Dublin, Dublin 2, Ireland; School of Engineering, Trinity College, The University of Dublin, Dublin 2, Ireland
| | - Alejandro Lopez Valdes
- Trinity Centre for Bioengineering, Trinity College, The University of Dublin, Dublin 2, Ireland; School of Engineering, Trinity College, The University of Dublin, Dublin 2, Ireland
| | - Cristina Simoes-Franklin
- Trinity Centre for Bioengineering, Trinity College, The University of Dublin, Dublin 2, Ireland; National Cochlear Implant Program, Beaumont Hospital, Dublin 9, Ireland; School of Medicine, Trinity College, The University of Dublin, Dublin 2, Ireland
| | - Laura Viani
- National Cochlear Implant Program, Beaumont Hospital, Dublin 9, Ireland; Royal College of Surgeons in Ireland, Dublin 2, Ireland; School of Medicine, Trinity College, The University of Dublin, Dublin 2, Ireland
| | - Richard B Reilly
- Trinity Centre for Bioengineering, Trinity College, The University of Dublin, Dublin 2, Ireland; School of Engineering, Trinity College, The University of Dublin, Dublin 2, Ireland; Royal College of Surgeons in Ireland, Dublin 2, Ireland; School of Medicine, Trinity College, The University of Dublin, Dublin 2, Ireland.
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21
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Han JH, Won JY, Hong SK, Kim JH, Kim ES, Kim HJ, Lee HJ. Objective measurement of subjective tinnitus using the acoustic change complex. PLoS One 2017; 12:e0188268. [PMID: 29176873 PMCID: PMC5703484 DOI: 10.1371/journal.pone.0188268] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 11/05/2017] [Indexed: 11/18/2022] Open
Abstract
At present, there is no objective method for diagnosing subjective sensorineural tinnitus. Recently, the acoustic change complex (ACC) has been used to evaluate neural detection of sounds. Thus, the present study aimed to examine whether the ACC can reflect cortical detection and discrimination of sounds matched with tinnitus frequencies. We hypothesized that the ACC to change stimuli matched with tinnitus frequencies would be decreased in tinnitus patients because the tinnitus interferes with the perception of acoustic changes. To test the hypothesis, 96 ears of normal-hearing (NH) tinnitus patients and controls were tested. Among the tinnitus patients, 33 ears with a tinnitus frequency of 8 kHz constituted the tinnitus group, and the remaining 63 ears with no experience of tinnitus were allocated to the control group. For the 4 kHz non-tinnitus matched frequency, a subset of tinnitus (n = 17) and NH (n = 47) subjects was tested. The acoustic stimuli were pure tones with a total duration of 500 ms consisting of a 1 kHz tone in the first 250 ms and a second tone of either 8 kHz or 4 kHz in the latter 250 ms. The normalized amplitude of the ACC (naACC) was calculated separately for the amplitude of the N1'-P2' complex evoked by an 8 kHz or 4 kHz change stimulus and for the amplitude of the N1-P2 complex elicited by the initial 1 kHz background stimulus. Our results showed that the naACC to an 8 kHz stimulus in the tinnitus group was significantly smaller than those to 4 kHz and 8 kHz in normal controls. Additionally, in the tinnitus group, the naACC to 4 kHz was greater compared to 8 kHz. The receiver operating characteristic (ROC) curve analysis conducted for naACC to 8 kHz at UCL revealed a fair degree of diagnostic efficacy. Overall, our results indicated that the ACC to a change stimulus matched with the tinnitus frequency can provide an objective measure of frequency-specific tinnitus.
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Affiliation(s)
- Ji-Hye Han
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Joong Yeon Won
- Department of Otolaryngology, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Sung Kwang Hong
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Chuncheon, Republic of Korea
- Department of Otolaryngology, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Ja Hee Kim
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Eun Soo Kim
- Department of Neuroradiology, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Hyung-Jong Kim
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Chuncheon, Republic of Korea
- Department of Otolaryngology, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Hyo-Jeong Lee
- Laboratory of Brain & Cognitive Sciences for Convergence Medicine, Hallym University College of Medicine, Chuncheon, Republic of Korea
- Department of Otolaryngology, Hallym University College of Medicine, Chuncheon, Republic of Korea
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22
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Dimitrijevic A, Smith ML, Kadis DS, Moore DR. Cortical Alpha Oscillations Predict Speech Intelligibility. Front Hum Neurosci 2017; 11:88. [PMID: 28286478 PMCID: PMC5323373 DOI: 10.3389/fnhum.2017.00088] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 02/13/2017] [Indexed: 12/21/2022] Open
Abstract
Understanding speech in noise (SiN) is a complex task involving sensory encoding and cognitive resources including working memory and attention. Previous work has shown that brain oscillations, particularly alpha rhythms (8–12 Hz) play important roles in sensory processes involving working memory and attention. However, no previous study has examined brain oscillations during performance of a continuous speech perception test. The aim of this study was to measure cortical alpha during attentive listening in a commonly used SiN task (digits-in-noise, DiN) to better understand the neural processes associated with “top-down” cognitive processing in adverse listening environments. We recruited 14 normal hearing (NH) young adults. DiN speech reception threshold (SRT) was measured in an initial behavioral experiment. EEG activity was then collected: (i) while performing the DiN near SRT; and (ii) while attending to a silent, close-caption video during presentation of identical digit stimuli that the participant was instructed to ignore. Three main results were obtained: (1) during attentive (“active”) listening to the DiN, a number of distinct neural oscillations were observed (mainly alpha with some beta; 15–30 Hz). No oscillations were observed during attention to the video (“passive” listening); (2) overall, alpha event-related synchronization (ERS) of central/parietal sources were observed during active listening when data were grand averaged across all participants. In some participants, a smaller magnitude alpha event-related desynchronization (ERD), originating in temporal regions, was observed; and (3) when individual EEG trials were sorted according to correct and incorrect digit identification, the temporal alpha ERD was consistently greater on correctly identified trials. No such consistency was observed with the central/parietal alpha ERS. These data demonstrate that changes in alpha activity are specific to listening conditions. To our knowledge, this is the first report that shows almost no brain oscillatory changes during a passive task compared to an active task in any sensory modality. Temporal alpha ERD was related to correct digit identification.
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Affiliation(s)
- Andrew Dimitrijevic
- Otolaryngology-Head and Neck Surgery, Sunnybrook Health Sciences CentreToronto, ON, Canada; Hurvitz Brain Sciences, Evaluative Clinical Sciences, Sunnybrook Research InstituteToronto, ON, Canada; Faculty of Medicine, Otolaryngology-Head and Neck SurgeryUniversity of Toronto, Toronto, ON, Canada
| | - Michael L Smith
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical CenterCincinnati, OH, USA; Speech and Hearing Sciences, University of WashingtonSeattle, WA, USA
| | - Darren S Kadis
- Pediatric Neuroimaging Research Consortium, Cincinnati Children's Hospital Medical CenterCincinnati, OH, USA; Division of Neurology, Cincinnati Children's Hospital Medical CenterCincinnati, OH, USA; Department of Pediatrics, University of Cincinnati, College of MedicineCincinnati, OH, USA
| | - David R Moore
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical CenterCincinnati, OH, USA; Department of Otolaryngology, University of CincinnatiCincinnati, OH, USA
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Thompson EC, Woodruff Carr K, White-Schwoch T, Tierney A, Nicol T, Kraus N. Hemispheric Asymmetry of Endogenous Neural Oscillations in Young Children: Implications for Hearing Speech In Noise. Sci Rep 2016; 6:19737. [PMID: 26804355 PMCID: PMC4726126 DOI: 10.1038/srep19737] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 12/16/2015] [Indexed: 11/17/2022] Open
Abstract
Speech signals contain information in hierarchical time scales, ranging from short-duration (e.g., phonemes) to long-duration cues (e.g., syllables, prosody). A theoretical framework to understand how the brain processes this hierarchy suggests that hemispheric lateralization enables specialized tracking of acoustic cues at different time scales, with the left and right hemispheres sampling at short (25 ms; 40 Hz) and long (200 ms; 5 Hz) periods, respectively. In adults, both speech-evoked and endogenous cortical rhythms are asymmetrical: low-frequency rhythms predominate in right auditory cortex, and high-frequency rhythms in left auditory cortex. It is unknown, however, whether endogenous resting state oscillations are similarly lateralized in children. We investigated cortical oscillations in children (3–5 years; N = 65) at rest and tested our hypotheses that this temporal asymmetry is evident early in life and facilitates recognition of speech in noise. We found a systematic pattern of increasing leftward asymmetry for higher frequency oscillations; this pattern was more pronounced in children who better perceived words in noise. The observed connection between left-biased cortical oscillations in phoneme-relevant frequencies and speech-in-noise perception suggests hemispheric specialization of endogenous oscillatory activity may support speech processing in challenging listening environments, and that this infrastructure is present during early childhood.
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Affiliation(s)
- Elaine C Thompson
- Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA.,Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA
| | - Kali Woodruff Carr
- Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA.,Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA
| | - Travis White-Schwoch
- Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA.,Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA
| | - Adam Tierney
- Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA.,Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA
| | - Trent Nicol
- Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA.,Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA
| | - Nina Kraus
- Auditory Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60208, USA.,Department of Communication Sciences, Northwestern University, Evanston, Illinois 60208, USA.,Institute for Neuroscience, Northwestern University, Evanston, Illinois 60208, USA.,Department of Neurobiology &Physiology, Northwestern University, Evanston, Illinois 60208, USA.,Department of Otolaryngology, Northwestern University, Evanston, Illinois 60208, USA
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24
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A prolonged maturational time course in brain development for cortical processing of temporal modulations. Clin Neurophysiol 2015; 127:994-998. [PMID: 26480832 DOI: 10.1016/j.clinph.2015.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 08/27/2015] [Accepted: 09/01/2015] [Indexed: 11/21/2022]
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