1
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Wang MC, Chi TS, Shiao AS, Li LPH, Hsieh JC. Clinical standardization for the detection of hemispheric dominance for steady-state auditory evoked fields in normal hearing. J Chin Med Assoc 2023; 86:1015-1019. [PMID: 37713316 DOI: 10.1097/jcma.0000000000000995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/17/2023] Open
Abstract
BACKGROUND Steady-state auditory evoked responses (SSAERs) are promising indicators of major auditory function. The improvement in accessibility in the clinical setting depends on the standardization and definition of the characteristics of SSAERs. There have been some insights into the changes in the interhemispheric dominance of SSAERs in some clinical entities. However, the hemispheric asymmetry of SSAERs in healthy controls remains inconclusive. METHODS Twelve right-handed healthy volunteers with normal hearing were recruited. Steady-state auditory evoked fields (SSAEFs) were measured binaurally using magnetoencephalography (MEG) under pure-tone auditory stimuli at 1000 Hz with an amplitude modulation frequency of 43 Hz. The laterality index, based on the ratio of SSAEF strength over the right hemisphere to that over the left hemisphere, was also analyzed. RESULTS The SSAEFs source was localized bilaterally on the superior temporal plane, with an orientation centripetal to the auditory cortex. The laterality index ranged from 1.1 to 2.3, and there were no sex differences. In all subjects, the strength of the SSAEFs was significantly weaker in the left hemisphere than in the right hemisphere ( p = 0.014). CONCLUSION Right-sided dominance of the SSAEFs was verified in subjects with normal hearing. Acoustic sources clinically available in audiometric tests were used as stimuli. Such a simplification of parameters would be helpful for the standardization of precise production and the definition of the characteristics of SSAERs. Because MEG is still not easily accessible clinically, further studies using electroencephalography with larger sample sizes are necessary to address these issues.
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Affiliation(s)
- Mao-Che Wang
- Department of Otolaryngology Head Neck Surgery, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
- Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
- Department of Otolaryngology Head Neck Surgery, Taipei City Hospital, Taipei, Taiwan, ROC
| | - Tai-Shih Chi
- Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, ROC
| | - An-Suey Shiao
- Department of Otolaryngology, Cheng Hsin General Hospital, Taipei, Taiwan, ROC
| | - Lieber Po-Hung Li
- Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
- Department of Otolaryngology, Cheng Hsin General Hospital, Taipei, Taiwan, ROC
- Institute of Brain Science, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan, ROC
- Integrated Brain Research Unit, Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
| | - Jen-Chuen Hsieh
- Integrated Brain Research Unit, Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
- Department of Biological Science and Technology, College of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, ROC
- Center for Intelligent Drug Systems and Smart Bio-devices, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, ROC
- Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
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2
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David W, Verwaerde E, Gransier R, Wouters J. Effects of analysis window on 40-Hz auditory steady-state responses in cochlear implant users. Hear Res 2023; 438:108882. [PMID: 37688847 DOI: 10.1016/j.heares.2023.108882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 08/25/2023] [Accepted: 08/31/2023] [Indexed: 09/11/2023]
Abstract
Auditory steady-state responses (ASSRs) are phase-locked responses of the auditory system to the envelope of a stimulus. These responses can be used as an objective proxy to assess temporal envelope processing and its related functional outcomes such as hearing thresholds and speech perception, in normal-hearing listeners, in persons with hearing impairment, as well as in cochlear-implant (CI) users. While ASSRs are traditionally measured using a continuous stimulation paradigm, an alternative is the intermittent stimulation paradigm, whereby stimuli are presented with silence intervals in between. This paradigm could be more useful in a clinical setting as it allows for other neural responses to be analysed concurrently. One clinical use case of the intermittent paradigm is to objectively program CIs during an automatic fitting session whereby electrically evoked ASSRs (eASSRs) as well as other evoked potentials are used to predict behavioural thresholds. However, there is no consensus yet about the optimal analysis parameters for an intermittent paradigm in order to detect and measure eASSRs reliably. In this study, we used the intermittent paradigm to evoke eASSRs in adult CI users and investigated whether the early response buildup affects the response measurement outcomes. To this end, we varied the starting timepoint and length of the analysis window within which the responses were analysed. We used the amplitude, signal-to-noise ratio (SNR), phase, and pairwise phase consistency (PPC) to characterize the responses. Moreover, we set out to find the optimal stimulus duration for efficient and reliable eASSR measurements. These analyses were performed at two stimulation levels, i.e., 100% and 50% of the dynamic range of each participant. Results revealed that inclusion of the first 300 ms in the analysis window leads to overestimation of response amplitude and underestimation of response phase. Additionally, the response SNR and PPC were not affected by the inclusion of the first 300 ms in the analysis window. However, the latter two metrics were highly dependent on the stimulus duration which complicates comparisons across studies. Finally, the optimal stimulus duration for quick and reliable characterization of eASSRs was found to be around 800 ms for the stimulation level of 100% DR. These findings suggest that inclusion of the early onset period of eASSR recordings negatively influences the response measurement outcomes and that efficient and reliable eASSR measurements are possible using stimuli of around 800 ms long. This will pave the path for the development of a clinically feasible eASSR measurement in CI users.
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Affiliation(s)
- Wouter David
- ExpORL, Dept. of Neurosciences, KU Leuven, Herestraat 49 box 721, 3000 Leuven, Belgium.
| | - Elise Verwaerde
- ExpORL, Dept. of Neurosciences, KU Leuven, Herestraat 49 box 721, 3000 Leuven, Belgium
| | - Robin Gransier
- ExpORL, Dept. of Neurosciences, KU Leuven, Herestraat 49 box 721, 3000 Leuven, Belgium
| | - Jan Wouters
- ExpORL, Dept. of Neurosciences, KU Leuven, Herestraat 49 box 721, 3000 Leuven, Belgium
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3
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Van Herck S, Economou M, Bempt FV, Ghesquière P, Vandermosten M, Wouters J. Pulsatile modulation greatly enhances neural synchronization at syllable rate in children. Neuroimage 2023:120223. [PMID: 37315772 DOI: 10.1016/j.neuroimage.2023.120223] [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: 07/07/2022] [Revised: 05/22/2023] [Accepted: 06/11/2023] [Indexed: 06/16/2023] Open
Abstract
Neural processing of the speech envelope is of crucial importance for speech perception and comprehension. This envelope processing is often investigated by measuring neural synchronization to sinusoidal amplitude-modulated stimuli at different modulation frequencies. However, it has been argued that these stimuli lack ecological validity. Pulsatile amplitude-modulated stimuli, on the other hand, are suggested to be more ecologically valid and efficient, and have increased potential to uncover the neural mechanisms behind some developmental disorders such a dyslexia. Nonetheless, pulsatile stimuli have not yet been investigated in pre-reading and beginning reading children, which is a crucial age for developmental reading research. We performed a longitudinal study to examine the potential of pulsatile stimuli in this age range. Fifty-two typically reading children were tested at three time points from the middle of their last year of kindergarten (5 years old) to the end of first grade (7 years old). Using electroencephalography, we measured neural synchronization to syllable rate and phoneme rate sinusoidal and pulsatile amplitude-modulated stimuli. Our results revealed that the pulsatile stimuli significantly enhance neural synchronization at syllable rate, compared to the sinusoidal stimuli. Additionally, the pulsatile stimuli at syllable rate elicited a different hemispheric specialization, more closely resembling natural speech envelope tracking. We postulate that using the pulsatile stimuli greatly increases EEG data acquisition efficiency compared to the common sinusoidal amplitude-modulated stimuli in research in younger children and in developmental reading research.
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Affiliation(s)
- Shauni Van Herck
- Research Group ExpORL, Department of Neurosciences, KU Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven, Belgium.
| | - Maria Economou
- Research Group ExpORL, Department of Neurosciences, KU Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven, Belgium
| | - Femke Vanden Bempt
- Research Group ExpORL, Department of Neurosciences, KU Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven, Belgium
| | - Pol Ghesquière
- Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven, Belgium
| | | | - Jan Wouters
- Research Group ExpORL, Department of Neurosciences, KU Leuven, Belgium
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4
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Kumar N, Jaiswal A, Roy D, Banerjee A. Effective networks mediate right hemispheric dominance of human 40 Hz auditory steady-state response. Neuropsychologia 2023; 184:108559. [PMID: 37040848 DOI: 10.1016/j.neuropsychologia.2023.108559] [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: 08/11/2022] [Revised: 02/17/2023] [Accepted: 04/04/2023] [Indexed: 04/13/2023]
Abstract
Auditory steady-state responses (ASSR) are induced from the brainstem to the neocortex when humans hear periodic amplitude-modulated tonal signals. ASSRs have been argued to be a key marker of auditory temporal processing and pathological reorganization of ASSR - a biomarker of neurodegenerative disorders. However, most of the earlier studies reporting the neural basis of ASSRs were focused on looking at individual brain regions. Here, we seek to characterize the large-scale directed information flow among cortical sources of ASSR entrained by 40 Hz external signals. Entrained brain rhythms with power peaking at 40 Hz were generated using both monaural and binaural tonal stimulation. First, we confirm the presence of ASSRs and their well-known right hemispheric dominance during binaural and both monaural conditions. Thereafter, reconstruction of source activity employing individual anatomy of the participant and subsequent network analysis revealed that while the sources are common among different stimulation conditions, differential levels of source activation and differential patterns of directed information flow using Granger causality among sources underlie processing of binaurally and monaurally presented tones. Particularly, we show bidirectional interactions involving the right superior temporal gyrus and inferior frontal gyrus underlie right hemispheric dominance of 40 Hz ASSR during both monaural and binaural conditions. On the other hand, for monaural conditions, the strength of inter-hemispheric flow from left primary auditory areas to right superior temporal areas followed a pattern that comply with the generally observed contralateral dominance of sensory signal processing.
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Affiliation(s)
- Neeraj Kumar
- Cognitive Brain Dynamics Lab, National Brain Research Centre, NH 8, Manesar, Gurgaon, 122052, India.
| | - Amit Jaiswal
- Cognitive Brain Dynamics Lab, National Brain Research Centre, NH 8, Manesar, Gurgaon, 122052, India
| | - Dipanjan Roy
- Cognitive Brain Dynamics Lab, National Brain Research Centre, NH 8, Manesar, Gurgaon, 122052, India
| | - Arpan Banerjee
- Cognitive Brain Dynamics Lab, National Brain Research Centre, NH 8, Manesar, Gurgaon, 122052, India.
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5
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Regev TI, Lipkin B, Boebinger D, Paunov A, Kean H, Norman-Haignere S, Fedorenko E. Preserved functional organization of human auditory cortex in individuals missing one temporal lobe from infancy. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.18.523979. [PMID: 36711687 PMCID: PMC9882328 DOI: 10.1101/2023.01.18.523979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Human cortical responses to natural sounds, measured with fMRI, can be approximated as the weighted sum of a small number of canonical response patterns (components), each having interpretable functional and anatomical properties. Here, we asked whether this organization is preserved in cases where only one temporal lobe is available due to early brain damage by investigating a unique family: one sibling born without a left temporal lobe, another without a right temporal lobe, and a third anatomically neurotypical. We analyzed fMRI responses to diverse natural sounds within the intact hemispheres of these individuals and compared them to 12 neurotypical participants. All siblings manifested the neurotypical auditory responses in their intact hemispheres. These results suggest that the development of the auditory cortex in each hemisphere does not depend on the existence of the other hemisphere, highlighting the redundancy and equipotentiality of the bilateral auditory system.
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Affiliation(s)
- Tamar I Regev
- Brain and Cognitive Sciences Department, Massachusetts Institute of Technology, Cambridge MA
- McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge MA
| | - Benjamin Lipkin
- Brain and Cognitive Sciences Department, Massachusetts Institute of Technology, Cambridge MA
- McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge MA
| | - Dana Boebinger
- Department of Biostatistics & Computational Biology, University of Rochester Medical Center, Rochester, NY
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY
| | - Alexander Paunov
- INSERM-CEA Cognitive Neuroimaging Unit (UNICOG), NeuroSpin Center, Gif sur Yvette, France
| | - Hope Kean
- Brain and Cognitive Sciences Department, Massachusetts Institute of Technology, Cambridge MA
- McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge MA
| | - Sam Norman-Haignere
- Department of Biostatistics & Computational Biology, University of Rochester Medical Center, Rochester, NY
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY
- Department of Biomedical Engineering, University of Rochester, Rochester, NY
- Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY
| | - Evelina Fedorenko
- Brain and Cognitive Sciences Department, Massachusetts Institute of Technology, Cambridge MA
- McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge MA
- Speech and Hearing Bioscience and Technology (SHBT) Program, Harvard University, Boston MA
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6
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Peter V, Goswami U, Burnham D, Kalashnikova M. Impaired neural entrainment to low frequency amplitude modulations in English-speaking children with dyslexia or dyslexia and DLD. BRAIN AND LANGUAGE 2023; 236:105217. [PMID: 36529116 DOI: 10.1016/j.bandl.2022.105217] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 08/19/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Neural synchronization to amplitude-modulated noise at three frequencies (2 Hz, 5 Hz, 8 Hz) thought to be important for syllable perception was investigated in English-speaking school-aged children. The theoretically-important delta-band (∼2Hz, stressed syllable level) was included along with two syllable-level rates. The auditory steady state response (ASSR) was recorded using EEG in 36 7-to-12-year-old children. Half of the sample had either dyslexia or dyslexia and DLD (developmental language disorder). In comparison to typically-developing children, children with dyslexia or with dyslexia and DLD showed reduced ASSRs for 2 Hz stimulation but similar ASSRs at 5 Hz and 8 Hz. These novel data for English ASSRs converge with prior data suggesting that children with dyslexia have atypical synchrony between brain oscillations and incoming auditory stimulation at ∼ 2 Hz, the rate of stressed syllable production across languages. This atypical synchronization likely impairs speech processing, phonological processing, and possibly syntactic processing, as predicted by Temporal Sampling theory.
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Affiliation(s)
- Varghese Peter
- MARCS Institute for Brain, Behaviour and Development, Western Sydney University, Australia; School of Health and Behavioural Sciences, University of the Sunshine Coast, Australia
| | - Usha Goswami
- Centre for Neuroscience in Education, University of Cambridge, UK
| | - Denis Burnham
- MARCS Institute for Brain, Behaviour and Development, Western Sydney University, Australia
| | - Marina Kalashnikova
- MARCS Institute for Brain, Behaviour and Development, Western Sydney University, Australia; BCBL. Basque Center on Cognition, Brain and Language, Spain; Ikerbasque, Basque Foundation for Science, Bilbao, Spain.
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7
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Nakamura T, Dinh TH, Asai M, Nishimaru H, Matsumoto J, Setogawa T, Ichijo H, Honda S, Yamada H, Mihara T, Nishijo H. Characteristics of auditory steady-state responses to different click frequencies in awake intact macaques. BMC Neurosci 2022; 23:57. [PMID: 36180823 PMCID: PMC9524006 DOI: 10.1186/s12868-022-00741-9] [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: 05/26/2022] [Accepted: 09/13/2022] [Indexed: 11/28/2022] Open
Abstract
Background Auditory steady-state responses (ASSRs) are periodic evoked responses to constant periodic auditory stimuli, such as click trains, and are suggested to be associated with higher cognitive functions in humans. Since ASSRs are disturbed in human psychiatric disorders, recording ASSRs from awake intact macaques would be beneficial to translational research as well as an understanding of human brain function and its pathology. However, ASSR has not been reported in awake macaques. Results Electroencephalograms (EEGs) were recorded from awake intact macaques, while click trains at 20–83.3 Hz were binaurally presented. EEGs were quantified based on event-related spectral perturbation (ERSP) and inter-trial coherence (ITC), and ASSRs were significantly demonstrated in terms of ERSP and ITC in awake intact macaques. A comparison of ASSRs among different click train frequencies indicated that ASSRs were maximal at 83.3 Hz. Furthermore, analyses of laterality indices of ASSRs showed that no laterality dominance of ASSRs was observed. Conclusions The present results demonstrated ASSRs, comparable to those in humans, in awake intact macaques. However, there were some differences in ASSRs between macaques and humans: macaques showed maximal ASSR responses to click frequencies higher than 40 Hz that has been reported to elicit maximal responses in humans, and showed no dominant laterality of ASSRs under the electrode montage in this study compared with humans with right hemisphere dominance. The future ASSR studies using awake intact macaques should be aware of these differences, and possible factors, to which these differences were ascribed, are discussed. Supplementary Information The online version contains supplementary material available at 10.1186/s12868-022-00741-9.
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Affiliation(s)
- Tomoya Nakamura
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Department of Anatomy, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan
| | - Trong Ha Dinh
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Department of Physiology, Vietnam Military Medical University, Hanoi, 100000, Vietnam
| | - Makoto Asai
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Hiroshi Nishimaru
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan
| | - Jumpei Matsumoto
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan
| | - Tsuyoshi Setogawa
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan.,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan
| | - Hiroyuki Ichijo
- Department of Anatomy, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan
| | - Sokichi Honda
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Hiroshi Yamada
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Takuma Mihara
- Candidate Discovery Science Labs, Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Ibaraki, 305-8585, Japan
| | - Hisao Nishijo
- System Emotional Science, Faculty of Medicine, University of Toyama, Sugitani2630, Toyama, 930-0194, Japan. .,Research Center for Idling Brain Science (RCIBS), University of Toyama, Toyama, 930-0194, Japan.
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Christodoulides P, Miltiadous A, Tzimourta KD, Peschos D, Ntritsos G, Zakopoulou V, Giannakeas N, Astrakas LG, Tsipouras MG, Tsamis KI, Glavas E, Tzallas AT. Classification of EEG signals from young adults with dyslexia combining a Brain Computer Interface device and an Interactive Linguistic Software Tool. Biomed Signal Process Control 2022. [DOI: 10.1016/j.bspc.2022.103646] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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9
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Granados Barbero R, Ghesquière P, Wouters J. Development of Atypical Reading at Ages 5 to 9 Years and Processing of Speech Envelope Modulations in the Brain. Front Comput Neurosci 2022; 16:894578. [PMID: 35782088 PMCID: PMC9248325 DOI: 10.3389/fncom.2022.894578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 05/09/2022] [Indexed: 11/25/2022] Open
Abstract
Different studies have suggested that during speech processing readers with dyslexia present atypical levels of neural entrainment as well as atypical functional hemispherical asymmetries in comparison with typical readers. In this study, we evaluated these differences in children and the variation with age before and after starting with formal reading instruction. Synchronized neural auditory processing activity was quantified based on auditory steady-state responses (ASSRs) from EEG recordings. The stimulation was modulated at syllabic and phonemic fluctuation rates present in speech. We measured the brain activation patterns and the hemispherical asymmetries in children at three age points (5, 7, and 9 years old). Despite the well-known heterogeneity during developmental stages, especially in children and in dyslexia, we could extract meaningful common oscillatory patterns. The analyses included (1) the estimations of source localization, (2) hemispherical preferences using a laterality index, measures of neural entrainment, (3) signal-to-noise ratios (SNRs), and (4) connectivity using phase coherence measures. In this longitudinal study, we confirmed that the existence of atypical levels of neural entrainment and connectivity already exists at pre-reading stages. Overall, these measures reflected a lower ability of the dyslectic brain to synchronize with syllabic rate stimulation. In addition, our findings reinforced the hypothesis of a later maturation of the processing of beta rhythms in dyslexia. This investigation emphasizes the importance of longitudinal studies in dyslexia, especially in children, where neural oscillatory patterns as well as differences between typical and atypical developing children can vary in the span of a year.
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Affiliation(s)
- Raúl Granados Barbero
- Research Group Experimental ORL, Department of Neurosciences, Katholieke University of Leuven, Leuven, Belgium
- *Correspondence: Raúl Granados Barbero
| | - Pol Ghesquière
- Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, Katholieke University of Leuven, Leuven, Belgium
| | - Jan Wouters
- Research Group Experimental ORL, Department of Neurosciences, Katholieke University of Leuven, Leuven, Belgium
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10
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Granados Barbero R, de Vos A, Ghesquière P, Wouters J. Atypical processing in neural source analysis of speech envelope modulations in adolescents with dyslexia. Eur J Neurosci 2021; 54:7839-7859. [PMID: 34730259 DOI: 10.1111/ejn.15515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 10/01/2021] [Accepted: 10/28/2021] [Indexed: 11/28/2022]
Abstract
Different studies have suggested that language and developmental disorders such as dyslexia are associated with a disturbance of auditory entrainment and of the functional hemispheric asymmetries during speech processing. These disorders typically result from an issue in the phonological component of language that causes problems to represent and manipulate the phonological structure of words at the syllable and/or phoneme level. We used Auditory Steady-State Responses (ASSRs) in EEG recordings to investigate the brain activation and hemisphere asymmetry of theta, alpha, beta and low-gamma range oscillations in typical readers and readers with dyslexia. The aim was to analyse whether the group differences found in previous electrode level studies were caused by a different source activation pattern or conversely was an effect that could be found on the active brain sources. We could not find differences in the brain locations of the main active brain sources. However, we observed differences in the extracted waveforms. The group average of the first DSS component of all signal-to-noise ratios of ASSR at source level was higher than the group averages at the electrode level. These analyses included a lower alpha synchronisation in adolescents with dyslexia and the possibility of compensatory mechanisms in theta, beta and low-gamma frequency bands. The main brain auditory sources were located in cortical regions around the auditory cortex. Thus, the differences observed in auditory EEG experiments would, according to our findings, have their origin in the intrinsic oscillatory mechanisms of the brain cortical sources related to speech perception.
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Affiliation(s)
- Raúl Granados Barbero
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Leuven, Belgium
| | - Astrid de Vos
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Leuven, Belgium.,Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Leuven, Belgium
| | - Pol Ghesquière
- Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Leuven, Belgium
| | - Jan Wouters
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Leuven, Belgium
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11
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Ríos-López P, Molinaro N, Bourguignon M, Lallier M. Right-hemisphere coherence to speech at pre-reading stages predicts reading performance one year later. JOURNAL OF COGNITIVE PSYCHOLOGY 2021. [DOI: 10.1080/20445911.2021.1986514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Paula Ríos-López
- BCBL, Basque Center on Cognition, Brain and Language, Donostia/San Sebastian, Spain
- Leibniz Institute for Neurobiology, Magdeburg, Germany
- Centre for Behavioral and Brain Sciences, Magdeburg, Germany
| | - Nicola Molinaro
- BCBL, Basque Center on Cognition, Brain and Language, Donostia/San Sebastian, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - Mathieu Bourguignon
- BCBL, Basque Center on Cognition, Brain and Language, Donostia/San Sebastian, Spain
- Laboratoire de Cartographie Fonctionnelle du Cerveau, Université Libre de Bruxelles, Bruxelles, Belgium
| | - Marie Lallier
- BCBL, Basque Center on Cognition, Brain and Language, Donostia/San Sebastian, Spain
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12
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Granados Barbero R, De Vos A, Wouters J. The identification of predominant auditory steady-state response brain sources in electroencephalography using denoising source separation. Eur J Neurosci 2021; 53:3688-3709. [PMID: 33811405 DOI: 10.1111/ejn.15219] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 01/26/2021] [Accepted: 03/29/2021] [Indexed: 12/24/2022]
Abstract
Different approaches have been used to extract auditory steady-state responses (ASSRs) from electroencephalography (EEG) recordings, including region-related electrode configurations (electrode level) and the manual placement of equivalent current dipoles (source level). Inherent limitations of these approaches are the assumption of the anatomical origin and the omission of activity generated by secondary sources. Data-driven methods such as independent component analysis (ICA) seem to avoid these limitations but only to face new others such as the presence of ASSRs with similar properties in different components and the manual selection protocol to select and classify the most relevant components carrying ASSRs. We propose the novel approach of applying a spatial filter to these components in order to extract the most relevant information. We aimed to develop a method based on the reproducibility across trials that performs reliably in low-signal-to-noise ratio (SNR) scenarios using denoising source separation (DSS). DSS combined with ICA successfully reduced the number of components and extracted the most relevant ASSR at 4, 10 and 20 Hz stimulation in group and individual level studies of EEG adolescent data. The anatomical brain location for these low stimulation frequencies showed results in cortical areas with relatively small dispersion. However, for 40 and 80 Hz, results with regard to the number of components and the anatomical origin were less clear. At all stimulation frequencies the outcome measures were consistent with literature, and the partial rejection of inter-subject variability led to more accurate results and higher SNRs. These findings are promising for future applications in group comparison involving pathologies.
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Affiliation(s)
- Raúl Granados Barbero
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven-University of Leuven, Leuven, Belgium
| | - Astrid De Vos
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven-University of Leuven, Leuven, Belgium.,Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven-University of Leuven, Leuven, Belgium
| | - Jan Wouters
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven-University of Leuven, Leuven, Belgium
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Bourke JD, Todd J. Acoustics versus linguistics? Context is Part and Parcel to lateralized processing of the parts and parcels of speech. Laterality 2021; 26:725-765. [PMID: 33726624 DOI: 10.1080/1357650x.2021.1898415] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The purpose of this review is to provide an accessible exploration of key considerations of lateralization in speech and non-speech perception using clear and defined language. From these considerations, the primary arguments for each side of the linguistics versus acoustics debate are outlined and explored in context of emerging integrative theories. This theoretical approach entails a perspective that linguistic and acoustic features differentially contribute to leftward bias, depending on the given context. Such contextual factors include stimulus parameters and variables of stimulus presentation (e.g., noise/silence and monaural/binaural) and variances in individuals (sex, handedness, age, and behavioural ability). Discussion of these factors and their interaction is also aimed towards providing an outline of variables that require consideration when developing and reviewing methodology of acoustic and linguistic processing laterality studies. Thus, there are three primary aims in the present paper: (1) to provide the reader with key theoretical perspectives from the acoustics/linguistics debate and a synthesis of the two viewpoints, (2) to highlight key caveats for generalizing findings regarding predominant models of speech laterality, and (3) to provide a practical guide for methodological control using predominant behavioural measures (i.e., gap detection and dichotic listening tasks) and/or neurophysiological measures (i.e., mismatch negativity) of speech laterality.
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Affiliation(s)
- Jesse D Bourke
- School of Psychology, University Drive, Callaghan, NSW 2308, Australia
| | - Juanita Todd
- School of Psychology, University Drive, Callaghan, NSW 2308, Australia
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14
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Effect of number and placement of EEG electrodes on measurement of neural tracking of speech. PLoS One 2021; 16:e0246769. [PMID: 33571299 PMCID: PMC7877609 DOI: 10.1371/journal.pone.0246769] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 01/25/2021] [Indexed: 11/19/2022] Open
Abstract
Measurement of neural tracking of natural running speech from the electroencephalogram (EEG) is an increasingly popular method in auditory neuroscience and has applications in audiology. The method involves decoding the envelope of the speech signal from the EEG signal, and calculating the correlation with the envelope of the audio stream that was presented to the subject. Typically EEG systems with 64 or more electrodes are used. However, in practical applications, set-ups with fewer electrodes are required. Here, we determine the optimal number of electrodes, and the best position to place a limited number of electrodes on the scalp. We propose a channel selection strategy based on an utility metric, which allows a quick quantitative assessment of the influence of a channel (or a group of channels) on the reconstruction error. We consider two use cases: a subject-specific case, where the optimal number and position of the electrodes is determined for each subject individually, and a subject-independent case, where the electrodes are placed at the same positions (in the 10-20 system) for all the subjects. We evaluated our approach using 64-channel EEG data from 90 subjects. In the subject-specific case we found that the correlation between actual and reconstructed envelope first increased with decreasing number of electrodes, with an optimum at around 20 electrodes, yielding 29% higher correlations using the optimal number of electrodes compared to all electrodes. This means that our strategy of removing electrodes can be used to improve the correlation metric in high-density EEG recordings. In the subject-independent case, we obtained a stable decoding performance when decreasing from 64 to 22 channels. When the number of channels was further decreased, the correlation decreased. For a maximal decrease in correlation of 10%, 32 well-placed electrodes were sufficient in 91% of the subjects.
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Farahani ED, Wouters J, van Wieringen A. Neural Generators Underlying Temporal Envelope Processing Show Altered Responses and Hemispheric Asymmetry Across Age. Front Aging Neurosci 2020; 12:596551. [PMID: 33343335 PMCID: PMC7746817 DOI: 10.3389/fnagi.2020.596551] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 11/02/2020] [Indexed: 01/09/2023] Open
Abstract
Speech understanding problems are highly prevalent in the aging population, even when hearing sensitivity is clinically normal. These difficulties are attributed to changes in central temporal processing with age and can potentially be captured by age-related changes in neural generators. The aim of this study is to investigate age-related changes in a wide range of neural generators during temporal processing in middle-aged and older persons with normal audiometric thresholds. A minimum-norm imaging technique is employed to reconstruct cortical and subcortical neural generators of temporal processing for different acoustic modulations. The results indicate that for relatively slow modulations (<50 Hz), the response strength of neural sources is higher in older adults than in younger ones, while the phase-locking does not change. For faster modulations (80 Hz), both the response strength and the phase-locking of neural sources are reduced in older adults compared to younger ones. These age-related changes in temporal envelope processing of slow and fast acoustic modulations are possibly due to loss of functional inhibition, which is accompanied by aging. Both cortical (primary and non-primary) and subcortical neural generators demonstrate similar age-related changes in response strength and phase-locking. Hemispheric asymmetry is also altered in older adults compared to younger ones. Alterations depend on the modulation frequency and side of stimulation. The current findings at source level could have important implications for the understanding of age-related changes in auditory temporal processing and for developing advanced rehabilitation strategies to address speech understanding difficulties in the aging population.
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Affiliation(s)
- Ehsan Darestani Farahani
- Research Group Experimental Oto-rhino-laryngology (ExpORL), Department of Neurosciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Jan Wouters
- Research Group Experimental Oto-rhino-laryngology (ExpORL), Department of Neurosciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Astrid van Wieringen
- Research Group Experimental Oto-rhino-laryngology (ExpORL), Department of Neurosciences, Katholieke Universiteit Leuven, Leuven, Belgium
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16
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Ríos‐López P, Molinaro N, Bourguignon M, Lallier M. Development of neural oscillatory activity in response to speech in children from 4 to 6 years old. Dev Sci 2020; 23:e12947. [PMID: 32043677 PMCID: PMC7685108 DOI: 10.1111/desc.12947] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 11/18/2019] [Accepted: 02/05/2020] [Indexed: 11/30/2022]
Abstract
Recent neurophysiological theories propose that the cerebral hemispheres collaborate to resolve the complex temporal nature of speech, such that left-hemisphere (or bilateral) gamma-band oscillatory activity would specialize in coding information at fast rates (phonemic information), whereas right-hemisphere delta- and theta-band activity would code for speech's slow temporal components (syllabic and prosodic information). Despite the relevance that neural entrainment to speech might have for reading acquisition and for core speech perception operations such as the perception of intelligible speech, no study had yet explored its development in young children. In the current study, speech-brain entrainment was recorded via EEG in a cohort of children at three different time points since they were 4-5 to 6-7 years of age. Our results showed that speech-brain entrainment occurred only at delta frequencies (0.5 Hz) at all testing times. The fact that, from the longitudinal perspective, coherence increased in bilateral temporal electrodes suggests that, contrary to previous hypotheses claiming for an innate right-hemispheric bias for processing prosodic information, at 7 years of age the low-frequency components of speech are processed in a bilateral manner. Lastly, delta speech-brain entrainment in the right hemisphere was related to an indirect measure of intelligibility, providing preliminary evidence that the entrainment phenomenon might support core linguistic operations since early childhood.
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Affiliation(s)
- Paula Ríos‐López
- BCBL ‐ Basque Center on Cognition, Brain and LanguageDonostia/San SebastianSpain
| | - Nicola Molinaro
- BCBL ‐ Basque Center on Cognition, Brain and LanguageDonostia/San SebastianSpain
- IkerbasqueBasque Foundation for ScienceBilbaoSpain
| | - Mathieu Bourguignon
- BCBL ‐ Basque Center on Cognition, Brain and LanguageDonostia/San SebastianSpain
- Laboratoire de Cartographie fonctionnelle du CerveauUniversite libre de BruxellesBrusselsBelgium
| | - Marie Lallier
- BCBL ‐ Basque Center on Cognition, Brain and LanguageDonostia/San SebastianSpain
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The relation between neurofunctional and neurostructural determinants of phonological processing in pre-readers. Dev Cogn Neurosci 2020; 46:100874. [PMID: 33130464 PMCID: PMC7606842 DOI: 10.1016/j.dcn.2020.100874] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 10/15/2020] [Accepted: 10/16/2020] [Indexed: 12/29/2022] Open
Abstract
Phonological processing skills are known as the most robust cognitive predictor of reading ability. Therefore, the neural determinants of phonological processing have been extensively investigated by means of either neurofunctional or neurostructural techniques. However, to fully understand how the brain represents and processes phonological information, there is need for studies that combine both methods. The present study applies such a multimodal approach with the aim of investigating the pre-reading relation between neural measures of auditory temporal processing, white matter properties of the reading network and phonological processing skills. We administered auditory steady-state responses, diffusion-weighted MRI scans and phonological awareness tasks in 59 pre-readers. Our results demonstrate that a stronger rightward lateralization of syllable-rate (4 Hz) processing coheres with higher fractional anisotropy in the left fronto-temporoparietal arcuate fasciculus. Both neural features each in turn relate to better phonological processing skills. As such, the current study provides novel evidence for the existence of a pre-reading relation between functional measures of syllable-rate processing, structural organization of the arcuate fasciculus and cognitive precursors of reading development. Moreover, our findings demonstrate the value of combining different neural techniques to gain insight in the underlying neural systems for reading (dis)ability.
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18
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Unmasking the relevance of hemispheric asymmetries—Break on through (to the other side). Prog Neurobiol 2020; 192:101823. [DOI: 10.1016/j.pneurobio.2020.101823] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Revised: 04/17/2020] [Accepted: 05/13/2020] [Indexed: 12/21/2022]
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Binaural summation of amplitude modulation involves weak interaural suppression. Sci Rep 2020; 10:3560. [PMID: 32103139 PMCID: PMC7044261 DOI: 10.1038/s41598-020-60602-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 02/10/2020] [Indexed: 11/29/2022] Open
Abstract
The brain combines sounds from the two ears, but what is the algorithm used to achieve this summation of signals? Here we combine psychophysical amplitude modulation discrimination and steady-state electroencephalography (EEG) data to investigate the architecture of binaural combination for amplitude-modulated tones. Discrimination thresholds followed a ‘dipper’ shaped function of pedestal modulation depth, and were consistently lower for binaural than monaural presentation of modulated tones. The EEG responses were greater for binaural than monaural presentation of modulated tones, and when a masker was presented to one ear, it produced only weak suppression of the response to a signal presented to the other ear. Both data sets were well-fit by a computational model originally derived for visual signal combination, but with suppression between the two channels (ears) being much weaker than in binocular vision. We suggest that the distinct ecological constraints on vision and hearing can explain this difference, if it is assumed that the brain avoids over-representing sensory signals originating from a single object. These findings position our understanding of binaural summation in a broader context of work on sensory signal combination in the brain, and delineate the similarities and differences between vision and hearing.
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20
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Abstract
BACKGROUND Postlingual single-sided deafness (SSD) is defined as normal hearing in one ear and severely impaired hearing in the other ear. A right ear advantage and dominance of the left hemisphere are well established findings in individuals with normal hearing and speech processing. Therefore, it seems plausible that a right ear advantage would exist in patients with SSD. METHODS The audiometric database was searched to identify patients with SSD. Results from the German monosyllabic Freiburg word test and four-syllabic number test in quiet were evaluated. Results of right-sided SSD were compared with left-sided SSD. Statistical calculations were done with the Mann-Whitney U test. RESULTS Four hundred and six patients with SSD were identified, 182 with right-sided and 224 with left-sided SSD. The two groups had similar pure-tone thresholds without significant differences. All test parameters of speech audiometry had better values for right ears (SSD left) when compared with left ears (SSD right). Statistically significant results (p < 0.05) were found for a weighted score (social index, 98.2 ± 4% right and 97.5 ± 4.7% left, p < 0.026), for word understanding at 60 dB SPL (95.2 ± 8.7% right and 93.9 ± 9.1% left, p < 0.035), and for the level at which 100% understanding was reached (61.5 ± 10.1 dB SPL right and 63.8 ± 11.1 dB SPL left, p < 0.022) on a performance-level function. CONCLUSION A right ear advantage of speech audiometry was found in patients with SSD in this retrospective study of audiometric test results.
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21
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Daneshvarfard F, Abrishami Moghaddam H, Dehaene-Lambertz G, Kongolo G, Wallois F, Mahmoudzadeh M. Neurodevelopment and asymmetry of auditory-related responses to repetitive syllabic stimuli in preterm neonates based on frequency-domain analysis. Sci Rep 2019; 9:10654. [PMID: 31337810 PMCID: PMC6650479 DOI: 10.1038/s41598-019-47064-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 07/01/2019] [Indexed: 11/20/2022] Open
Abstract
Sensory development of the human brain begins prenatally, allowing cortical auditory responses to be recorded at an early age in preterm infants. Despite several studies focusing on the temporal characteristics of preterm infants' cortical responses, few have been conducted on frequency analysis of these responses. In this study, we performed frequency and coherence analysis of preterm infants' auditory responses to series of syllables and also investigated the functional brain asymmetry of preterm infants for the detection of the regularity of auditory stimuli. Cortical auditory evoked potentials (CAEPs) were recorded in 16 preterm infants with a mean recording age of 31.48 weeks gestational age (29.57-34.14 wGA) in response to a repetitive syllabic stimulus. Peak amplitudes of the frequency response at the target frequency and the first harmonic, as well as the phase coherence (PC) at the target frequency were extracted as age-dependent variables. A functional asymmetry coefficient was defined as a lateralization index for the amplitude of the target frequency at each electrode site. While the findings revealed a significant positive correlation between the mean amplitude at the target frequency vs. age (R2 = 0.263, p = 0.042), no significant correlation was observed for age-related changes of the mean amplitude at the first harmonic. A significant correlation was also observed between the mean PC and age (R2 = 0.318, p = 0.023). A right hemisphere lateralization over many channels was also generally observed. The results demonstrate that rightward lateralization for slow rate modulation, previously observed in adults, children and newborns, appears to be in place at a very young age, even in preterm infants.
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Affiliation(s)
- Farveh Daneshvarfard
- INSERM U1105, Université de Picardie, CURS, Amiens, France
- Faculty of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran, Iran
| | - Hamid Abrishami Moghaddam
- INSERM U1105, Université de Picardie, CURS, Amiens, France.
- Faculty of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran, Iran.
| | - Ghislaine Dehaene-Lambertz
- Cognitive Neuroimaging Unit, CEA DSV/I2BM, INSERM, CNRS, Université Paris-Sud, Université Paris-Saclay, NeuroSpin Center, 91191 Gif/Yvette, France
| | - Guy Kongolo
- INSERM U1105, Université de Picardie, CURS, Amiens, France
- INSERM U1105, Neonatal ICU, South University Hospital, Amiens, France
| | - Fabrice Wallois
- INSERM U1105, Université de Picardie, CURS, Amiens, France.
- INSERM U1105, Unit Exploration Fonctionnelles du Système Nerveux Pédiatrique, South University Hospital, Amiens, France.
| | - Mahdi Mahmoudzadeh
- INSERM U1105, Université de Picardie, CURS, Amiens, France
- INSERM U1105, Unit Exploration Fonctionnelles du Système Nerveux Pédiatrique, South University Hospital, Amiens, France
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Van Eeckhoutte M, Wouters J, Francart T. Objective Binaural Loudness Balancing Based on 40-Hz Auditory Steady-State Responses. Part I: Normal Hearing. Trends Hear 2019; 22:2331216518805352. [PMID: 30334493 PMCID: PMC6196616 DOI: 10.1177/2331216518805352] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Psychophysical procedures are used to balance loudness across the ears. However, they can be difficult and require active cooperation. We investigated whether 40-Hz auditory steady-state response (ASSR) amplitudes can be used to objectively estimate the balanced loudness across the ears for a group of young, normal-hearing participants. The 40-Hz ASSRs were recorded using monaural stimuli with carrier frequencies of 500, 1000, or 2000 Hz over a range of levels between 40 and 80 dB SPL. Behavioral loudness balancing was performed for at least one reference level of the left ear. ASSR amplitude growth functions were listener dependent, but median across-ear ratios in ASSR amplitudes were close to 1. The differences between the ASSR-predicted balanced levels and the behaviorally found balanced levels were smaller than 5 dB in 59% of cases and smaller than 10 dB in 85% of cases. The differences between the ASSR-predicted balanced levels and the reference levels were smaller than 5 dB in 54% of cases and smaller than 10 dB in 87% of cases. No clear hemispheric lateralization was found for 40-Hz ASSRs, with the exception of responses evoked by stimulus levels of 40 to 60 dB SPL at 2000 Hz.
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Affiliation(s)
| | - Jan Wouters
- 1 ExpORL, Department of Neurosciences, KU Leuven, Belgium
| | - Tom Francart
- 1 ExpORL, Department of Neurosciences, KU Leuven, Belgium
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Goossens T, Vercammen C, Wouters J, van Wieringen A. The association between hearing impairment and neural envelope encoding at different ages. Neurobiol Aging 2019; 74:202-212. [DOI: 10.1016/j.neurobiolaging.2018.10.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 09/11/2018] [Accepted: 10/04/2018] [Indexed: 10/28/2022]
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Matsubara T, Ogata K, Hironaga N, Uehara T, Mitsudo T, Shigeto H, Maekawa T, Tobimatsu S. Monaural 40-Hz auditory steady-state magnetic responses can be useful for identifying epileptic focus in mesial temporal lobe epilepsy. Clin Neurophysiol 2018; 130:341-351. [PMID: 30669010 DOI: 10.1016/j.clinph.2018.11.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 10/19/2018] [Accepted: 11/28/2018] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Patients with mesial temporal lobe epilepsy (mTLE) often exhibit central auditory processing (CAP) dysfunction. Monaural 40-Hz auditory steady-state magnetic responses (ASSRs) were recorded to explore the pathophysiology of mTLE. METHODS Eighteen left mTLE patients, 11 right mTLE patients and 16 healthy controls (HCs) were examined. Monaural clicks were presented at a rate of 40 Hz. Phase-locking factor (PLF) and power values were analyzed within bilateral Heschl's gyri. RESULTS Monaural 40-Hz ASSR demonstrated temporal frequency dynamics in both PLF and power data. Symmetrical hemispheric contralaterality was revealed in HCs. However, predominant contralaterality was absent in mTLE patients. Specifically, right mTLE patients exhibited a lack of contralaterality in response to left ear but not right ear stimulation, and vice versa in left mTLE patients. CONCLUSION This is the first study to use monaural 40-Hz ASSR with unilateral mTLE patients to clarify the relationship between CAP and epileptic focus. CAP dysfunction was characterized by a lack of contralaterality corresponding to epileptic focus. SIGNIFICANCE Monaural 40-Hz ASSR can provide useful information for localizing epileptic focus in mTLE patients.
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Affiliation(s)
- Teppei Matsubara
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan.
| | - Katsuya Ogata
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
| | - Naruhito Hironaga
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
| | - Taira Uehara
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
| | - Takako Mitsudo
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
| | - Hiroshi Shigeto
- Epilepsy and Sleep Center, Fukuoka Sanno Hospital, Fukuoka, Japan
| | | | - Shozo Tobimatsu
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
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Melynyte S, Pipinis E, Genyte V, Voicikas A, Rihs T, Griskova-Bulanova I. 40 Hz Auditory Steady-State Response: The Impact of Handedness and Gender. Brain Topogr 2017; 31:419-429. [PMID: 29218677 DOI: 10.1007/s10548-017-0611-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 12/04/2017] [Indexed: 01/31/2023]
Abstract
The 40 Hz auditory steady-state response (ASSR) is a periodic response to a periodic stimulation. Its sources are located in the primary auditory cortex and the asymmetry of the planum temporale has previously been associated with hand preference and gender-related differences; thus subject's handedness and gender could potentially influence ASSRs. Nevertheless, electrophysiological studies of ASSRs are mainly dominated by right-handed participants and the observed findings can only be generalized to the right-handed populations. However, for a potential use of 40 Hz ASSR as a translational biomarker of neuropsychiatric disorders, it is important to investigate the response in association to handedness and gender. We included an equal number of left-handed and right-handed males and females and recorded EEG responses during left-ear, right-ear and both ears stimulation. The results of the study suggest that the processing of 40 Hz auditory stimulation depends on the subjects' gender and handedness: significantly lower phase-locking and strength of 40 Hz ASSRs were observed in left-handed females as compared to left-handed males, but right-handers did not differ in 40 Hz ASSRs. Our observation of the opposite impact of gender in the examined handedness groups stresses the importance of careful consideration of handedness and gender factors when evaluating the determinants of inter individual variability of 40 Hz ASSRs. This finding is of particular importance for clinical studies in psychiatry and neurology.
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Affiliation(s)
- Sigita Melynyte
- Institute of Biosciences, Life Sciences Centre, Vilnius University, Sauletekio ave 7, 10257, Vilnius, Lithuania
| | - Evaldas Pipinis
- Institute of Biosciences, Life Sciences Centre, Vilnius University, Sauletekio ave 7, 10257, Vilnius, Lithuania
| | - Vaida Genyte
- Institute of Biosciences, Life Sciences Centre, Vilnius University, Sauletekio ave 7, 10257, Vilnius, Lithuania
| | - Aleksandras Voicikas
- Institute of Biosciences, Life Sciences Centre, Vilnius University, Sauletekio ave 7, 10257, Vilnius, Lithuania
| | - Tonia Rihs
- Department of Fundamental Neurosciences, University of Geneva, Geneva, Switzerland
| | - Inga Griskova-Bulanova
- Institute of Biosciences, Life Sciences Centre, Vilnius University, Sauletekio ave 7, 10257, Vilnius, Lithuania.
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Guérit F, Marozeau J, Epp B. Linear combination of auditory steady-state responses evoked by co-modulated tones. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2017; 142:EL395. [PMID: 29092566 DOI: 10.1121/1.5007757] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Up to medium intensities and in the 80-100-Hz region, the auditory steady-state response (ASSR) to a multi-tone carrier is commonly considered to be a linear sum of the dipoles from each tone specific ASSR generator. Here, this hypothesis was investigated when a unique modulation frequency is used for all carrier components. Listeners were presented with a co-modulated dual-frequency carrier (1 and 4 kHz), from which the modulator starting phase Φi of the 1-kHz component was systematically varied. The results support the hypothesis of a linear superposition of the dipoles originating from different frequency specific ASSR generators.
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Affiliation(s)
- François Guérit
- Hearing Systems group, Department of Electrical Engineering, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark , ,
| | - Jeremy Marozeau
- Hearing Systems group, Department of Electrical Engineering, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark , ,
| | - Bastian Epp
- Hearing Systems group, Department of Electrical Engineering, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark , ,
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27
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De Vos A, Vanvooren S, Vanderauwera J, Ghesquière P, Wouters J. A longitudinal study investigating neural processing of speech envelope modulation rates in children with (a family risk for) dyslexia. Cortex 2017; 93:206-219. [DOI: 10.1016/j.cortex.2017.05.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 03/17/2017] [Accepted: 05/04/2017] [Indexed: 01/19/2023]
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De Vos A, Vanvooren S, Vanderauwera J, Ghesquière P, Wouters J. Atypical neural synchronization to speech envelope modulations in dyslexia. BRAIN AND LANGUAGE 2017; 164:106-117. [PMID: 27833037 DOI: 10.1016/j.bandl.2016.10.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 09/06/2016] [Accepted: 10/19/2016] [Indexed: 05/13/2023]
Abstract
A fundamental deficit in the synchronization of neural oscillations to temporal information in speech could underlie phonological processing problems in dyslexia. In this study, the hypothesis of a neural synchronization impairment is investigated more specifically as a function of different neural oscillatory bands and temporal information rates in speech. Auditory steady-state responses to 4, 10, 20 and 40Hz modulations were recorded in normal reading and dyslexic adolescents to measure neural synchronization of theta, alpha, beta and low-gamma oscillations to syllabic and phonemic rate information. In comparison to normal readers, dyslexic readers showed reduced non-synchronized theta activity, reduced synchronized alpha activity and enhanced synchronized beta activity. Positive correlations between alpha synchronization and phonological skills were found in normal readers, but were absent in dyslexic readers. In contrast, dyslexic readers exhibited positive correlations between beta synchronization and phonological skills. Together, these results suggest that auditory neural synchronization of alpha and beta oscillations is atypical in dyslexia, indicating deviant neural processing of both syllabic and phonemic rate information. Impaired synchronization of alpha oscillations in particular demonstrated to be the most prominent neural anomaly possibly hampering speech and phonological processing in dyslexic readers.
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Affiliation(s)
- Astrid De Vos
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Herestraat 49 Box 721, 3000 Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Leopold Vanderkelenstraat 32 Box 3765, 3000 Leuven, Belgium.
| | - Sophie Vanvooren
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Herestraat 49 Box 721, 3000 Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Leopold Vanderkelenstraat 32 Box 3765, 3000 Leuven, Belgium
| | - Jolijn Vanderauwera
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Herestraat 49 Box 721, 3000 Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Leopold Vanderkelenstraat 32 Box 3765, 3000 Leuven, Belgium
| | - Pol Ghesquière
- Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Leopold Vanderkelenstraat 32 Box 3765, 3000 Leuven, Belgium
| | - Jan Wouters
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Herestraat 49 Box 721, 3000 Leuven, Belgium
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Undurraga JA, Haywood NR, Marquardt T, McAlpine D. Neural Representation of Interaural Time Differences in Humans-an Objective Measure that Matches Behavioural Performance. J Assoc Res Otolaryngol 2016; 17:591-607. [PMID: 27628539 PMCID: PMC5112218 DOI: 10.1007/s10162-016-0584-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 08/15/2016] [Indexed: 12/22/2022] Open
Abstract
Humans, and many other species, exploit small differences in the timing of sounds at the two ears (interaural time difference, ITD) to locate their source and to enhance their detection in background noise. Despite their importance in everyday listening tasks, however, the neural representation of ITDs in human listeners remains poorly understood, and few studies have assessed ITD sensitivity to a similar resolution to that reported perceptually. Here, we report an objective measure of ITD sensitivity in electroencephalography (EEG) signals to abrupt modulations in the interaural phase of amplitude-modulated low-frequency tones. Specifically, we measured following responses to amplitude-modulated sinusoidal signals (520-Hz carrier) in which the stimulus phase at each ear was manipulated to produce discrete interaural phase modulations at minima in the modulation cycle-interaural phase modulation following responses (IPM-FRs). The depth of the interaural phase modulation (IPM) was defined by the sign and the magnitude of the interaural phase difference (IPD) transition which was symmetric around zero. Seven IPM depths were assessed over the range of ±22 ° to ±157 °, corresponding to ITDs largely within the range experienced by human listeners under natural listening conditions (120 to 841 μs). The magnitude of the IPM-FR was maximal for IPM depths in the range of ±67.6 ° to ±112.6 ° and correlated well with performance in a behavioural experiment in which listeners were required to discriminate sounds containing IPMs from those with only static IPDs. The IPM-FR provides a sensitive measure of binaural processing in the human brain and has a potential to assess temporal binaural processing.
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Affiliation(s)
- Jaime A Undurraga
- Department Linguistics, The Australian Hearing Hub, Macquarie University, 16 University Avenue, Sydney, NSW, 2109, Australia.
- UCL Ear Institute, University College London, 332 Gray's Inn Rd., London, WC1X8EE, UK.
| | - Nick R Haywood
- Department Linguistics, The Australian Hearing Hub, Macquarie University, 16 University Avenue, Sydney, NSW, 2109, Australia
- UCL Ear Institute, University College London, 332 Gray's Inn Rd., London, WC1X8EE, UK
| | - Torsten Marquardt
- UCL Ear Institute, University College London, 332 Gray's Inn Rd., London, WC1X8EE, UK
| | - David McAlpine
- Department Linguistics, The Australian Hearing Hub, Macquarie University, 16 University Avenue, Sydney, NSW, 2109, Australia
- UCL Ear Institute, University College London, 332 Gray's Inn Rd., London, WC1X8EE, UK
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Luke R, De Vos A, Wouters J. Source analysis of auditory steady-state responses in acoustic and electric hearing. Neuroimage 2016; 147:568-576. [PMID: 27894891 DOI: 10.1016/j.neuroimage.2016.11.023] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 10/06/2016] [Accepted: 11/05/2016] [Indexed: 11/17/2022] Open
Abstract
Speech is a complex signal containing a broad variety of acoustic information. For accurate speech reception, the listener must perceive modulations over a range of envelope frequencies. Perception of these modulations is particularly important for cochlear implant (CI) users, as all commercial devices use envelope coding strategies. Prolonged deafness affects the auditory pathway. However, little is known of how cochlear implantation affects the neural processing of modulated stimuli. This study investigates and contrasts the neural processing of envelope rate modulated signals in acoustic and CI listeners. Auditory steady-state responses (ASSRs) are used to study the neural processing of amplitude modulated (AM) signals. A beamforming technique is applied to determine the increase in neural activity relative to a control condition, with particular attention paid to defining the accuracy and precision of this technique relative to other tomographies. In a cohort of 44 acoustic listeners, the location, activity and hemispheric lateralisation of ASSRs is characterised while systematically varying the modulation rate (4, 10, 20, 40 and 80Hz) and stimulation ear (right, left and bilateral). We demonstrate a complex pattern of laterality depending on both modulation rate and stimulation ear that is consistent with, and extends, existing literature. We present a novel extension to the beamforming method which facilitates source analysis of electrically evoked auditory steady-state responses (EASSRs). In a cohort of 5 right implanted unilateral CI users, the neural activity is determined for the 40Hz rate and compared to the acoustic cohort. Results indicate that CI users activate typical thalamic locations for 40Hz stimuli. However, complementary to studies of transient stimuli, the CI population has atypical hemispheric laterality, preferentially activating the contralateral hemisphere.
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Affiliation(s)
- Robert Luke
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Belgium
| | - Astrid De Vos
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Belgium; Parenting and Special Education Research Unit, Faculty of Psychology and Educational Sciences, KU Leuven - University of Leuven, Belgium
| | - Jan Wouters
- Research Group Experimental ORL, Department of Neurosciences, KU Leuven - University of Leuven, Belgium
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31
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Haywood NR, Undurraga JA, Marquardt T, McAlpine D. A Comparison of Two Objective Measures of Binaural Processing: The Interaural Phase Modulation Following Response and the Binaural Interaction Component. Trends Hear 2015; 19:19/0/2331216515619039. [PMID: 26721925 PMCID: PMC4771038 DOI: 10.1177/2331216515619039] [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] [Indexed: 11/25/2022] Open
Abstract
There has been continued interest in clinical objective measures of binaural processing. One commonly proposed measure is the binaural interaction component (BIC), which is obtained typically by recording auditory brainstem responses (ABRs)—the BIC reflects the difference between the binaural ABR and the sum of the monaural ABRs (i.e., binaural − (left + right)). We have recently developed an alternative, direct measure of sensitivity to interaural time differences, namely, a following response to modulations in interaural phase difference (the interaural phase modulation following response; IPM-FR). To obtain this measure, an ongoing diotically amplitude-modulated signal is presented, and the interaural phase difference of the carrier is switched periodically at minima in the modulation cycle. Such periodic modulations to interaural phase difference can evoke a steady state following response. BIC and IPM-FR measurements were compared from 10 normal-hearing subjects using a 16-channel electroencephalographic system. Both ABRs and IPM-FRs were observed most clearly from similar electrode locations—differential recordings taken from electrodes near the ear (e.g., mastoid) in reference to a vertex electrode (Cz). Although all subjects displayed clear ABRs, the BIC was not reliably observed. In contrast, the IPM-FR typically elicited a robust and significant response. In addition, the IPM-FR measure required a considerably shorter recording session. As the IPM-FR magnitude varied with interaural phase difference modulation depth, it could potentially serve as a correlate of perceptual salience. Overall, the IPM-FR appears a more suitable clinical measure than the BIC.
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Affiliation(s)
- Nicholas R Haywood
- UCL Ear Institute, UCL School of Life and Medical Sciences, University College London, UK
| | - Jaime A Undurraga
- UCL Ear Institute, UCL School of Life and Medical Sciences, University College London, UK
| | - Torsten Marquardt
- UCL Ear Institute, UCL School of Life and Medical Sciences, University College London, UK
| | - David McAlpine
- UCL Ear Institute, UCL School of Life and Medical Sciences, University College London, UK
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Vanvooren S, Hofmann M, Poelmans H, Ghesquière P, Wouters J. Theta, beta and gamma rate modulations in the developing auditory system. Hear Res 2015; 327:153-62. [PMID: 26117409 DOI: 10.1016/j.heares.2015.06.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Revised: 04/26/2015] [Accepted: 06/22/2015] [Indexed: 11/29/2022]
Abstract
In the brain, the temporal analysis of many important auditory features relies on the synchronized firing of neurons to the auditory input rhythm. These so-called neural oscillations play a crucial role in sensory and cognitive processing and deviances in oscillatory activity have shown to be associated with neurodevelopmental disorders. Given the importance of neural auditory oscillations in normal and impaired sensory and cognitive functioning, there has been growing interest in their developmental trajectory from early childhood on. In the present study, neural auditory processing was investigated in typically developing young children (n = 40) and adults (n = 27). In all participants, auditory evoked theta, beta and gamma responses were recorded. The results of this study show maturational differences between children and adults in neural auditory processing at cortical as well as at brainstem level. Neural background noise at cortical level was shown to be higher in children compared to adults. In addition, higher theta response amplitudes were measured in children compared to adults. For beta and gamma rate modulations, different processing asymmetry patterns were observed between both age groups. The mean response phase was also shown to differ significantly between children and adults for all rates. Results suggest that cortical auditory processing of beta develops from a general processing pattern into a more specialized asymmetric processing preference over age. Moreover, the results indicate an enhancement of bilateral representation of monaural sound input at brainstem with age. A dissimilar efficiency of auditory signal transmission from brainstem to cortex along the auditory pathway between children and adults is suggested. These developmental differences might be due to both functional experience-dependent as well as anatomical changes. The findings of the present study offer important information about maturational differences between children and adults for responses to theta, beta and gamma rates. The current study can have important implications for the understanding of developmental disorders which are known to be associated with deviances in neural auditory processing.
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Affiliation(s)
- Sophie Vanvooren
- Department of Neurosciences, ExpORL, University of Leuven, Leuven, Belgium; Parenting and Special Education Research Unit, University of Leuven, Leuven, Belgium.
| | - Michael Hofmann
- Department of Neurosciences, ExpORL, University of Leuven, Leuven, Belgium
| | - Hanne Poelmans
- Department of Neurosciences, ExpORL, University of Leuven, Leuven, Belgium; Parenting and Special Education Research Unit, University of Leuven, Leuven, Belgium
| | - Pol Ghesquière
- Parenting and Special Education Research Unit, University of Leuven, Leuven, Belgium
| | - Jan Wouters
- Department of Neurosciences, ExpORL, University of Leuven, Leuven, Belgium
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Han JH, Dimitrijevic A. Acoustic change responses to amplitude modulation: a method to quantify cortical temporal processing and hemispheric asymmetry. Front Neurosci 2015; 9:38. [PMID: 25717291 PMCID: PMC4324071 DOI: 10.3389/fnins.2015.00038] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 01/26/2015] [Indexed: 11/18/2022] Open
Abstract
Objective: Sound modulation is a critical temporal cue for the perception of speech and environmental sounds. To examine auditory cortical responses to sound modulation, we developed an acoustic change stimulus involving amplitude modulation (AM) of ongoing noise. The AM transitions in this stimulus evoked an acoustic change complex (ACC) that was examined parametrically in terms of rate and depth of modulation and hemispheric symmetry. Methods: Auditory cortical potentials were recorded from 64 scalp electrodes during passive listening in two conditions: (1) ACC from white noise to 4, 40, 300 Hz AM, with varying AM depths of 100, 50, 25% lasting 1 s and (2) 1 s AM noise bursts at the same modulation rate. Behavioral measures included AM detection from an attend ACC condition and AM depth thresholds (i.e., a temporal modulation transfer function, TMTF). Results: The N1 response of the ACC was large to 4 and 40 Hz and small to the 300 Hz AM. In contrast, the opposite pattern was observed with bursts of AM showing larger responses with increases in AM rate. Brain source modeling showed significant hemispheric asymmetry such that 4 and 40 Hz ACC responses were dominated by right and left hemispheres respectively. Conclusion: N1 responses to the ACC resembled a low pass filter shape similar to a behavioral TMTF. In the ACC paradigm, the only stimulus parameter that changes is AM and therefore the N1 response provides an index for this AM change. In contrast, an AM burst stimulus contains both AM and level changes and is likely dominated by the rise time of the stimulus. The hemispheric differences are consistent with the asymmetric sampling in time hypothesis suggesting that the different hemispheres preferentially sample acoustic time across different time windows. Significance: The ACC provides a novel approach to studying temporal processing at the level of cortex and provides further evidence of hemispheric specialization for fast and slow stimuli.
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Affiliation(s)
- Ji Hye Han
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center Cincinnati, OH, USA
| | - Andrew Dimitrijevic
- Communication Sciences Research Center, Cincinnati Children's Hospital Medical Center Cincinnati, OH, USA
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34
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Hemispheric asymmetry in auditory processing of speech envelope modulations in prereading children. J Neurosci 2014; 34:1523-9. [PMID: 24453339 DOI: 10.1523/jneurosci.3209-13.2014] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The temporal envelope of speech is an important cue contributing to speech intelligibility. Theories about the neural foundations of speech perception postulate that the left and right auditory cortices are functionally specialized in analyzing speech envelope information at different time scales: the right hemisphere is thought to be specialized in processing syllable rate modulations, whereas a bilateral or left hemispheric specialization is assumed for phoneme rate modulations. Recently, it has been found that this functional hemispheric asymmetry is different in individuals with language-related disorders such as dyslexia. Most studies were, however, performed in adults and school-aged children, and only a little is known about how neural auditory processing at these specific rates manifests and develops in very young children before reading acquisition. Yet, studying hemispheric specialization for processing syllable and phoneme rate modulations in preliterate children may reveal early neural markers for dyslexia. In the present study, human cortical evoked potentials to syllable and phoneme rate modulations were measured in 5-year-old children at high and low hereditary risk for dyslexia. The results demonstrate a right hemispheric preference for processing syllable rate modulations and a symmetric pattern for phoneme rate modulations, regardless of hereditary risk for dyslexia. These results suggest that, while hemispheric specialization for processing syllable rate modulations seems to be mature in prereading children, hemispheric specialization for phoneme rate modulation processing may still be developing. These findings could have important implications for the development of phonological and reading skills.
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