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Crum R, Chowsilpa S, Kaski D, Giunti P, Bamiou DE, Koohi N. Hearing rehabilitation of adults with auditory processing disorder: a systematic review and meta-analysis of current evidence-based interventions. Front Hum Neurosci 2024; 18:1406916. [PMID: 38974481 PMCID: PMC11224551 DOI: 10.3389/fnhum.2024.1406916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Accepted: 05/31/2024] [Indexed: 07/09/2024] Open
Abstract
Background For adults with auditory processing disorder (APD), listening and communicating can be difficult, potentially leading to social isolation, depression, employment difficulties and certainly reducing the quality of life. Despite existing practice guidelines suggesting treatments, the efficacy of these interventions remains uncertain due to a lack of comprehensive reviews. This systematic review and meta-analysis aim to establish current evidence on the effectiveness of interventions for APD in adults, addressing the urgent need for clarity in the field. Methods Following the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines, we conducted a systematic search across MEDLINE (Ovid), Embase (Ovid), Web of Science and Scopus, focusing on intervention studies involving adults with APD. Studies that met the inclusion criteria were grouped according to intervention with a meta-analysis only conducted where intervention, study design and outcome measure were comparable. Results Out of 1,618 screened records, 13 studies were included, covering auditory training (AT), low-gain hearing aids (LGHA), and personal remote microphone systems (PRMS). Our analysis revealed: AT, Mixed results with some improvements in speech intelligibility and listening ability, indicating potential benefits but highlighting the need for standardized protocols; LGHA, The included studies demonstrated significant improvements in monaural low redundancy speech testing (p < 0.05), suggesting LGHA could enhance speech perception in noisy environments. However, limitations include small sample sizes and potential biases in study design. PRMS, Demonstrated the most consistent evidence of benefit, significantly improving speech testing results, with no additional benefit from combining PRMS with other interventions. Discussion PRMS presents the most evidence-supported intervention for adults with APD, although further high-quality research is crucial for all intervention types. The establishment and implementation of standardized intervention protocols alongside rigorously validated outcome measures will enable a more evidence-based approach to managing APD in adults.
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Affiliation(s)
- Rachel Crum
- The Ear Institute, University College London, London, United Kingdom
| | - Sanathorn Chowsilpa
- The Ear Institute, University College London, London, United Kingdom
- Otology Neurotology and Communication Disorder Unit, Department of Otolaryngology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Diego Kaski
- The Ear Institute, University College London, London, United Kingdom
- Department of Clinical and Movement Neurosciences, Institute of Neurology, University College London, London, United Kingdom
- Neuro-otology Department, University College London Hospitals, London, United Kingdom
- Ataxia Centre, National Hospital for Neurology and Neurosurgery, University College London Hospitals, London, United Kingdom
| | - Paola Giunti
- Department of Clinical and Movement Neurosciences, Institute of Neurology, University College London, London, United Kingdom
- Ataxia Centre, National Hospital for Neurology and Neurosurgery, University College London Hospitals, London, United Kingdom
| | - Doris-Eva Bamiou
- The Ear Institute, University College London, London, United Kingdom
- Neuro-otology Department, University College London Hospitals, London, United Kingdom
- Biomedical Research Centre, National Institute for Health Research, London, United Kingdom
| | - Nehzat Koohi
- The Ear Institute, University College London, London, United Kingdom
- Department of Clinical and Movement Neurosciences, Institute of Neurology, University College London, London, United Kingdom
- Ataxia Centre, National Hospital for Neurology and Neurosurgery, University College London Hospitals, London, United Kingdom
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Araki T, Hiragi T, Kuga N, Luo C, Andoh M, Sugao K, Nagata H, Sasaki T, Ikegaya Y, Koyama R. Microglia induce auditory dysfunction after status epilepticus in mice. Glia 2024; 72:274-288. [PMID: 37746760 DOI: 10.1002/glia.24472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 09/08/2023] [Accepted: 09/14/2023] [Indexed: 09/26/2023]
Abstract
Auditory dysfunction and increased neuronal activity in the auditory pathways have been reported in patients with temporal lobe epilepsy, but the cellular mechanisms involved are unknown. Here, we report that microglia play a role in the disinhibition of auditory pathways after status epilepticus in mice. We found that neuronal activity in the auditory pathways, including the primary auditory cortex and the medial geniculate body (MGB), was increased and auditory discrimination was impaired after status epilepticus. We further demonstrated that microglia reduced inhibitory synapses on MGB relay neurons over an 8-week period after status epilepticus, resulting in auditory pathway hyperactivity. In addition, we found that local removal of microglia from the MGB attenuated the increase in c-Fos+ relay neurons and improved auditory discrimination. These findings reveal that thalamic microglia are involved in auditory dysfunction in epilepsy.
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Affiliation(s)
- Tasuku Araki
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Toshimitsu Hiragi
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Nahoko Kuga
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Cong Luo
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Megumi Andoh
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | | | | | - Takuya Sasaki
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Yuji Ikegaya
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
- Institute for AI and Beyond, The University of Tokyo, Tokyo, Japan
- Center for Information and Neural Networks, National Institute of Information and Communications Technology, Osaka, Japan
| | - Ryuta Koyama
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
- Institute for AI and Beyond, The University of Tokyo, Tokyo, Japan
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Billig AJ, Lad M, Sedley W, Griffiths TD. The hearing hippocampus. Prog Neurobiol 2022; 218:102326. [PMID: 35870677 PMCID: PMC10510040 DOI: 10.1016/j.pneurobio.2022.102326] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 06/08/2022] [Accepted: 07/18/2022] [Indexed: 11/17/2022]
Abstract
The hippocampus has a well-established role in spatial and episodic memory but a broader function has been proposed including aspects of perception and relational processing. Neural bases of sound analysis have been described in the pathway to auditory cortex, but wider networks supporting auditory cognition are still being established. We review what is known about the role of the hippocampus in processing auditory information, and how the hippocampus itself is shaped by sound. In examining imaging, recording, and lesion studies in species from rodents to humans, we uncover a hierarchy of hippocampal responses to sound including during passive exposure, active listening, and the learning of associations between sounds and other stimuli. We describe how the hippocampus' connectivity and computational architecture allow it to track and manipulate auditory information - whether in the form of speech, music, or environmental, emotional, or phantom sounds. Functional and structural correlates of auditory experience are also identified. The extent of auditory-hippocampal interactions is consistent with the view that the hippocampus makes broad contributions to perception and cognition, beyond spatial and episodic memory. More deeply understanding these interactions may unlock applications including entraining hippocampal rhythms to support cognition, and intervening in links between hearing loss and dementia.
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Affiliation(s)
| | - Meher Lad
- Translational and Clinical Research Institute, Newcastle University Medical School, Newcastle upon Tyne, UK
| | - William Sedley
- Translational and Clinical Research Institute, Newcastle University Medical School, Newcastle upon Tyne, UK
| | - Timothy D Griffiths
- Biosciences Institute, Newcastle University Medical School, Newcastle upon Tyne, UK; Wellcome Centre for Human Neuroimaging, UCL Queen Square Institute of Neurology, University College London, London, UK; Human Brain Research Laboratory, Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, USA
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Rajasekaran AK, Shivashankar N, Sinha S, Saini J, Subbakrishna DK, Satishchandra P. Auditory Temporal Ordering in Patients with Medial Temporal Lobe Epilepsy with and without Hippocampal Sclerosis. Neurol India 2021; 69:414-418. [PMID: 33904465 DOI: 10.4103/0028-3886.314569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Context Temporal lobe epilepsy can affect central auditory processing (CAP) skills. Auditory temporal ordering (ATO) is a CAP skill that can be evaluated using duration pattern test (DPT). Aim The aim is to evaluate ATO in patients with medial temporal lobe epilepsy (MTLE) with hippocampal sclerosis (MTLE + HS) and without hippocampal sclerosis (MTLE-HS) and in their subgroups. Settings and Design It was a prospective cross-sectional behavioral observational study conducted in a tertiary neuropsychiatric hospital. Subjects and Methods The subjects were patients with refractory MTLE (N = 100), comprising 50 "MTLE + HS" patients and 50 "MTLE-HS". Age-range matched normal healthy subjects (n = 50) formed the control group. Both groups were administered duration pattern test (DPT). Statistical Analysis Used Analysis of variance (ANOVA) with post hoc analysis, Dunnett's two-sided and Bonferroni, paired sample t-test, Pearson's correlation, and independent t-test. Results The clinical groups performed significantly poorer than the control group, and however, did not differ significantly between them. The age at onset and the duration of the seizures did not have significant relation with the test measures. Conclusions Patients with "MTLE + HS" as well as those with "MTLE-HS" and their respective subgroups revealed abnormal ATO indicating CAP dysfunction.
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Affiliation(s)
- Aravind K Rajasekaran
- Department of Speech Pathology and Audiology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India
| | - Nagarajarao Shivashankar
- Department of Speech Pathology and Audiology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India
| | - Sanjib Sinha
- Department of Neurology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India
| | - Jitender Saini
- Department of Neuroimaging and Interventional Radiology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India
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Chowsilpa S, Bamiou DE, Koohi N. Effectiveness of the Auditory Temporal Ordering and Resolution Tests to Detect Central Auditory Processing Disorder in Adults With Evidence of Brain Pathology: A Systematic Review and Meta-Analysis. Front Neurol 2021; 12:656117. [PMID: 34149594 PMCID: PMC8206525 DOI: 10.3389/fneur.2021.656117] [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: 01/20/2021] [Accepted: 03/29/2021] [Indexed: 01/19/2023] Open
Abstract
Background: Auditory temporal processing tests are key clinical measures in order to diagnose central auditory processing disorder (CAPD). Although these tests have been used for decades, there is no up-to-date evidence to determine the effectiveness of detecting the abnormalities in central auditory processing in adults while the available national CAPD guidelines predominantly address CAPD in the pediatric population. Purpose: To determine the efficacy of the auditory temporal ordering tests [duration pattern test (DPT) and frequency pattern test (FPT)], and a temporal resolution test [gaps-in-noise (GIN) test] for detecting the central auditory processing abnormalities in adults with documented brain pathology. Research Design: Systematic reviews and meta-analyses. Study samples: Four databases, including PubMed, Web of Science, Embase, and Scopus, were systematically searched. The publications in the English language that recruited adults (above 16 years old) with pathologic brain conditions and described the diagnostic tests for auditory temporal processing were selected for review. Data Collections and Analysis: All data were systematically evaluated, extracted, categorized, and summarized in tables. The meta-analysis was done in order to determine the effectiveness of the DPT, FPT, and GIN tests. Results: The results showed significantly poorer performance of DPT and FPT, compared between participants with confirmed brain disease and normal controls, at the mean differences of percent correct −21.93 (95% CI, −26.58 to −17.29) and −31.37 (95% CI, −40.55 to −22.19), respectively. Subjects with brain pathology also performed poorer in GIN test at the mean difference of 3.19 milliseconds (95% CI, 2.51 to 3.87). Conclusion: The results from the meta-analysis provide evidence that DPT, FPT, and GIN clinical measures are effective in the diagnosis of CAPD in adults with neurological disorders. Poor performance on these tests is significantly related to the confirmed brain pathology. However, different units in results presentation and variety of testing strategies are limitations for this meta-analysis. The standard pattern of result reporting and international protocols test strategies should be developed in order to conduct better meta-analyses with a larger collection of suitable studies and less heterogeneity.
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Affiliation(s)
- Sanathorn Chowsilpa
- The Ear Institute, University College London, London, United Kingdom.,Otology Neurotology and Communication Disorder Unit, Department of Otolaryngology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Doris-Eva Bamiou
- The Ear Institute, University College London, London, United Kingdom.,Neuro-Otology Department, University College London Hospitals, London, United Kingdom.,Biomedical Research Centre, National Institute for Health Research, London, United Kingdom
| | - Nehzat Koohi
- The Ear Institute, University College London, London, United Kingdom.,Neuro-Otology Department, University College London Hospitals, London, United Kingdom.,Department of Clinical and Movement Neurosciences, Institute of Neurology, University College London, London, United Kingdom
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Cui W, Shang K, Qiu B, Lu J, Gao JH. White matter network disorder in mesial temporal epilepsy: An fMRI study. Epilepsy Res 2021; 172:106590. [PMID: 33639419 DOI: 10.1016/j.eplepsyres.2021.106590] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 12/11/2020] [Accepted: 02/16/2021] [Indexed: 01/13/2023]
Abstract
Mesial temporal lobe epilepsy (mTLE) has been considered a network disorder disease in which brain regions extending beyond the epileptogenic zones are always affected. However, abnormalities in white matter (WM) functional networks and their associations with widespread network dysfunction are still being identified in mTLE. Accordingly, we investigated the altered functional activities in WM networks in mTLE using fMRI, which has recently been used to probe WM function. We collected resting-state fMRI data from 39 unilateral mTLE patients with hippocampal sclerosis and 29 healthy controls. Eleven WM networks were clustered according to temporal correlation profile. The functional connectivity (FC) of the WM networks were evaluated and compared between the two groups. Furthermore, we assessed the capacity of WM FC for seizure lateralization. According to our analysis, mTLE led to decreased FC within deep WM networks. In addition, the cortical regions involved in seizure propagation and several brain regions displaying interhemispheric disruption showed enhanced functional coupling with deep WM networks. FCs between the ipsilateral deep WM networks and the insula, temporal lobe, and supramarginal gyrus demonstrated positive correlation with seizure frequency. Moreover, the seizure onset zones of 33 patients out of 39 patients could be correctly lateralized. Our findings reveal functional disruptions in WM networks extending to extratemporal regions, supporting the network disorder hypothesis and suggesting that deep WM networks are key network nodes associated with massive dysfunction in mTLE. Moreover, the FC of the WM represents a potentially useful functional imaging measure for the diagnosis of mTLE.
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Affiliation(s)
- Wei Cui
- Center for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China; Center for MRI Research, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Kun Shang
- Department of Nuclear Medicine, Xuanwu Hospital Capital Medical University, Beijing, China
| | - Bensheng Qiu
- Center for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Jie Lu
- Department of Nuclear Medicine, Xuanwu Hospital Capital Medical University, Beijing, China.
| | - Jia-Hong Gao
- Center for MRI Research, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China; Beijing City Key Laboratory for Medical Physics and Engineering, Institution of Heavy Ion Physics, School of Physics, Peking University, Beijing, China; McGovern Institute for Brain Research, Peking University, Beijing, China.
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Keni RR, Radhakrishnan A. Using McGurk effect to detect speech-perceptional abnormalities in refractory epilepsy. Epilepsy Behav 2021; 114:107600. [PMID: 33248941 DOI: 10.1016/j.yebeh.2020.107600] [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: 08/23/2020] [Revised: 10/19/2020] [Accepted: 10/25/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND McGurk effect is a perceptual phenomenon that demonstrates an interaction between hearing and vision in speech perception. A wide range of neuropsychological deficits have been described in people with long-standing epilepsy, which affect multimodal integration in speech perception and hence refractory epilepsy patients are ideal for testing the McGurk effect. MATERIALS AND METHODS We studied the McGurk effect in 50 patients diagnosed with medically refractory left or right hemispheric epilepsy based on clinical, radiological, and electrophysiological data. RESULTS The McGurk effect was better perceived (p = 0.006) in patients with left hemispheric epilepsy (n = 12, 71%) compared to right (n = 5, 29%). The other factors which compromised the perception of the McGurk effect were impairments in visual memory (p = 0.041), facial emotion recognition (p = 0.001), and lip-reading (p = 0.006). Perception of the McGurk effect reduced significantly (p = 0.006) when the epilepsy duration was 10 years or beyond. CONCLUSION The McGurk effect can be used in refractory epilepsy patients, to detect subtle abnormalities in speech perception, before significant irreversible speech and language dysfunction become evident.
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Affiliation(s)
- Ravish R Keni
- R. Madhavan Nayar Centre for Comprehensive Epilepsy Care, Department of Neurology, Sree ChitraTirunal Institute for Medical Sciences and Technology, Kerala, India
| | - Ashalatha Radhakrishnan
- R. Madhavan Nayar Centre for Comprehensive Epilepsy Care, Department of Neurology, Sree ChitraTirunal Institute for Medical Sciences and Technology, Kerala, India.
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Tobimatsu S. Neuromagnetic oscillations in the human sensory systems: A mini review of our series and literature. Neurosci Res 2020; 156:117-129. [PMID: 31874215 DOI: 10.1016/j.neures.2019.12.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 11/06/2019] [Accepted: 11/27/2019] [Indexed: 11/19/2022]
Abstract
Oscillatory neuronal (electrical) activity in defined frequency ranges supports synchronous interactions between anatomically distinct regions of the human brain during cognitive tasks. Here, the author reviews our previous studies that focused on the neuromagnetic oscillations in the sensory systems in response to the external stimuli in normal healthy subjects and neurological disorders. A magnetoencephalography was applied to evaluate the neuromagnetic oscillations in humans. We have demonstrated that the oscillatory gamma synchronization binds the primary and secondary somatosensory areas (S1 and S2) in humans. This functional coupling is modulated by aging. In people who stutter, functional and structural reorganization of the right auditory cortex appears to be a compensatory mechanism for impaired left auditory cortex function. This may be partly caused by increased right hemispheric local phase synchronization and increased inter-hemispheric phase synchronization. We have also found that the hippocampus modulates auditory processing differently under normal conditions and in epileptic patients with hippocampal sclerosis. This indicates that altered neural synchronization may provide useful information about possible functional deterioration in patients with unilateral mesial temporal lobe epilepsy. Finally, supraspinal (cortical) mechanism is responsible for pain perception and pain relief via neural oscillations. Together, neuronal synchronization plays an important role in distributed cortico-cortical processing.
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Affiliation(s)
- Shozo Tobimatsu
- Department of Clinical Neurophysiology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
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Direct electrophysiological mapping of human pitch-related processing in auditory cortex. Neuroimage 2019; 202:116076. [PMID: 31401239 DOI: 10.1016/j.neuroimage.2019.116076] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 07/28/2019] [Accepted: 08/05/2019] [Indexed: 11/23/2022] Open
Abstract
This work sought correlates of pitch perception, defined by neural activity above the lower limit of pitch (LLP), in auditory cortical neural ensembles, and examined their topographical distribution. Local field potentials (LFPs) were recorded in eight patients undergoing invasive recordings for pharmaco-resistant epilepsy. Stimuli consisted of bursts of broadband noise followed by regular interval noise (RIN). RIN was presented at rates below and above the LLP to distinguish responses related to the regularity of the stimulus and the presence of pitch itself. LFPs were recorded from human cortical homologues of auditory core, belt, and parabelt regions using multicontact depth electrodes implanted in Heschl's gyrus (HG) and Planum Temporale (PT), and subdural grid electrodes implanted over lateral superior temporal gyrus (STG). Evoked responses corresponding to the temporal regularity of the stimulus were assessed using autocorrelation of the evoked responses, and occurred for stimuli below and above the LLP. Induced responses throughout the high gamma range (60-200 Hz) were present for pitch values above the LLP, with onset latencies of approximately 70 ms. Mapping of the induced responses onto a common brain space demonstrated variability in the topographical distribution of high gamma responses across subjects. Induced responses were present throughout the length of HG and on PT, which is consistent with previous functional neuroimaging studies. Moreover, in each subject, a region within lateral STG showed robust induced responses at pitch-evoking stimulus rates. This work suggests a distributed representation of pitch processing in neural ensembles in human homologues of core and non-core auditory cortex.
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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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Matsubara T, Ogata K, Hironaga N, Kikuchi Y, Uehara T, Chatani H, Mitsudo T, Shigeto H, Tobimatsu S. Altered neural synchronization to pure tone stimulation in patients with mesial temporal lobe epilepsy: An MEG study. Epilepsy Behav 2018; 88:96-105. [PMID: 30243112 DOI: 10.1016/j.yebeh.2018.08.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 08/28/2018] [Accepted: 08/29/2018] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Our previous study of monaural auditory evoked magnetic fields (AEFs) demonstrated that hippocampal sclerosis significantly modulated auditory processing in patients with mesial temporal lobe epilepsy (mTLE). However, the small sample size (n = 17) and focus on the M100 response were insufficient to elucidate the lateralization of the epileptic focus. Therefore, we increased the number of patients with mTLE (n = 39) to examine whether neural synchronization induced by monaural pure tone stimulation provides useful diagnostic information about epileptic foci in patients with unilateral mTLE. METHODS Twenty-five patients with left mTLE, 14 patients with right mTLE, and 32 healthy controls (HCs) were recruited. Auditory stimuli of 500-Hz tone burst were monaurally presented to subjects. The AEF data were analyzed with source estimation of M100 responses in bilateral auditory cortices (ACs). Neural synchronization within ACs and between ACs was evaluated with phase-locking factor (PLF) and phase-locking value (PLV), respectively. Linear discriminant analysis was performed for diagnosis and lateralization of epileptic focus. RESULTS The M100 amplitude revealed that patients with right mTLE exhibited smaller M100 amplitude than patients with left mTLE and HCs. Interestingly, PLF was able to differentiate the groups with mTLE, with decreased PLFs in the alpha band observed in patients with right mTLE compared with those (PLFs) in patients with left mTLE. Right hemispheric predominance was confirmed in both HCs and patients with left mTLE while patients with right mTLE showed a lack of right hemispheric predominance. Functional connectivity between bilateral ACs (PLV) was reduced in both patients with right and left mTLE compared with that of HCs. The accuracy of diagnosis and lateralization was 80%-90%. CONCLUSION Auditory cortex subnormal function was more pronounced in patients with right mTLE compared with that in patients with left mTLE as well as HCs. Monaural AEFs can be used to reveal the pathophysiology of mTLE. Overall, our results indicate that altered neural synchronization may provide useful information about possible functional deterioration in patients with unilateral mTLE.
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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
| | - Yoshikazu Kikuchi
- Department of Otorhinolaryngology, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Taira Uehara
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
| | - Hiroshi Chatani
- 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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Zheng L, Bin G, Zeng H, Zou D, Gao J, Zhang J, Huang B. Meta-analysis of voxel-based morphometry studies of gray matter abnormalities in patients with mesial temporal lobe epilepsy and unilateral hippocampal sclerosis. Brain Imaging Behav 2018; 12:1497-1503. [DOI: 10.1007/s11682-017-9797-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Benninger KL, Ruess L, Slaughter LA, Maitre NL, Rusin JA. Neonatal Vein of Labbé Infarction Size is Associated With Long-Term Language Outcomes. Pediatr Neurol 2017; 72:70-75.e1. [PMID: 28495146 PMCID: PMC5480620 DOI: 10.1016/j.pediatrneurol.2017.03.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 03/16/2017] [Accepted: 03/26/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND The vein of Labbé is a superficial cortical vein, which drains the lateral surface of the temporal lobe. Thrombosis of the vein of Labbé can occur in the neonatal period. The developmental outcomes of infants who had vein of Labbé thrombosis are unknown as few studies of outcomes exist. METHODS We completed a retrospective review of infants born ≥34 weeks of gestation, diagnosed with vein of Labbé thrombosis, and/or infarction on neuroimaging during the first 30 days of life. Size of each temporal lobe infarction was estimated based on the number of temporal lobe segments involved. Primary outcomes were the presence of major neurodevelopmental impairments in childhood and Bayley scores at two years. RESULTS Our cohort of 19 infants had a median gestational age of 38 weeks (interquartile range 36 to 39) and mean birth weight 2892 ± 920 grams. The most common presenting symptoms of vein of Labbé thrombosis and infarction of surrounding tissue were seizures, apnea, lethargy, and either hypertonia or hypotonia. At the latest clinical follow-up appointment documented in the electronic medical record (mean 4.4 ± 3.08 years), 44% had major neurodevelopmental impairment. Patients with large vein of Labbé infarctions had significantly worse average Bayley scores than those with small to moderate lesions, and differences in language composite were statistically significant (72.7 vs 107.8, P = 0.017). CONCLUSIONS Neonates with large vein of Labbé infarctions are more likely to have poor language outcomes. This finding suggests a need for targeted surveillance to ensure early identification of deficits and referral for intervention.
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Affiliation(s)
- Kristen L. Benninger
- Center for Perinatal Research, The Research Institute at Nationwide
Children’s Hospital,The Ohio State University, Wexner Medical Center, Columbus, OH
| | - Lynne Ruess
- Department of Radiology, Nationwide Children’s
Hospital,The Ohio State University, Wexner Medical Center, Columbus, OH
| | - Laurel A. Slaughter
- Division of Neurology, Department of Pediatrics, Nationwide
Children’s Hospital,The Ohio State University, Wexner Medical Center, Columbus, OH
| | - Nathalie L. Maitre
- Center for Perinatal Research, The Research Institute at Nationwide
Children’s Hospital,The Ohio State University, Wexner Medical Center, Columbus, OH
| | - Jerome A. Rusin
- Department of Radiology, Nationwide Children’s
Hospital,The Ohio State University, Wexner Medical Center, Columbus, OH
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Jin SH, Chung CK. Electrophysiological resting-state biomarker for diagnosing mesial temporal lobe epilepsy with hippocampal sclerosis. Epilepsy Res 2016; 129:138-145. [PMID: 28043064 DOI: 10.1016/j.eplepsyres.2016.11.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 11/10/2016] [Accepted: 11/22/2016] [Indexed: 10/20/2022]
Abstract
The main aim of the present study was to evaluate whether resting-state functional connectivity of magnetoencephalography (MEG) signals can differentiate patients with mesial temporal lobe epilepsy (MTLE) from healthy controls (HC) and can differentiate between right and left MTLE as a diagnostic biomarker. To this end, a support vector machine (SVM) method among various machine learning algorithms was employed. We compared resting-state functional networks between 46 MTLE (right MTLE=23; left MTLE=23) patients with histologically proven HS who were free of seizure after surgery, and 46 HC. The optimal SVM group classifier distinguished MTLE patients with a mean accuracy of 95.1% (sensitivity=95.8%; specificity=94.3%). Increased connectivity including the right posterior cingulate gyrus and decreased connectivity including at least one sensory-related resting-state network were key features reflecting the differences between MTLE patients and HC. The optimal SVM model distinguished between right and left MTLE patients with a mean accuracy of 76.2% (sensitivity=76.0%; specificity=76.5%). We showed the potential of electrophysiological resting-state functional connectivity, which reflects brain network reorganization in MTLE patients, as a possible diagnostic biomarker to differentiate MTLE patients from HC and differentiate between right and left MTLE patients.
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Affiliation(s)
- Seung-Hyun Jin
- Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea; iMediSyn Inc., Seoul, Republic of Korea.
| | - Chun Kee Chung
- Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Neurosurgery, Seoul National University Hospital, Seoul, Republic of Korea; Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Republic of Korea.
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15
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Auditory temporal processing in patients with temporal lobe epilepsy. Epilepsy Behav 2016; 60:81-85. [PMID: 27179714 DOI: 10.1016/j.yebeh.2016.04.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Revised: 04/02/2016] [Accepted: 04/04/2016] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Auditory temporal processing is the main feature of speech processing ability. Patients with temporal lobe epilepsy, despite their normal hearing sensitivity, may present speech recognition disorders. The present study was carried out to evaluate the auditory temporal processing in patients with unilateral TLE. MATERIALS AND METHODS The present study was carried out on 25 patients with epilepsy: 11 patients with right temporal lobe epilepsy and 14 with left temporal lobe epilepsy with a mean age of 31.1years and 18 control participants with a mean age of 29.4years. The two experimental and control groups were evaluated via gap-in-noise and duration pattern sequence tests. One-way ANOVA was run to analyze the data. RESULTS The mean of the threshold of the GIN test in the control group was observed to be better than that in participants with LTLE and RTLE. Also, it was observed that the percentage of correct responses on the DPS test in the control group and in participants with RTLE was better than that in participants with LTLE. CONCLUSION Patients with TLE have difficulties in temporal processing. Difficulties are more significant in patients with LTLE, likely because the left temporal lobe is specialized for the processing of temporal information.
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Temporal Lobe Epilepsy Alters Auditory-motor Integration For Voice Control. Sci Rep 2016; 6:28909. [PMID: 27356768 PMCID: PMC4928116 DOI: 10.1038/srep28909] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 06/13/2016] [Indexed: 11/16/2022] Open
Abstract
Temporal lobe epilepsy (TLE) is the most common drug-refractory focal epilepsy in adults. Previous research has shown that patients with TLE exhibit decreased performance in listening to speech sounds and deficits in the cortical processing of auditory information. Whether TLE compromises auditory-motor integration for voice control, however, remains largely unknown. To address this question, event-related potentials (ERPs) and vocal responses to vocal pitch errors (1/2 or 2 semitones upward) heard in auditory feedback were compared across 28 patients with TLE and 28 healthy controls. Patients with TLE produced significantly larger vocal responses but smaller P2 responses than healthy controls. Moreover, patients with TLE exhibited a positive correlation between vocal response magnitude and baseline voice variability and a negative correlation between P2 amplitude and disease duration. Graphical network analyses revealed a disrupted neuronal network for patients with TLE with a significant increase of clustering coefficients and path lengths as compared to healthy controls. These findings provide strong evidence that TLE is associated with an atypical integration of the auditory and motor systems for vocal pitch regulation, and that the functional networks that support the auditory-motor processing of pitch feedback errors differ between patients with TLE and healthy controls.
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17
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Han SH, Lee EM, Choi EJ, Ryu HU, Kang JK, Chung JW. Changes in Central Auditory Processing in Patients with Mesial Temporal Lobe Epilepsy after Anterior Temporal Lobectomy with Amygdalohippocampectomy. J Clin Neurol 2016; 12:151-9. [PMID: 27074293 PMCID: PMC4828560 DOI: 10.3988/jcn.2016.12.2.151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 08/27/2015] [Accepted: 08/27/2015] [Indexed: 11/17/2022] Open
Abstract
Background and Purpose This study aimed to determine the effects of anterior temporal lobectomy with amygdalohippocampectomy (ATL-AH) on central auditory processing (CAP) in patients with mesial temporal lobe epilepsy with hippocampal sclerosis (mTLE-HS), and to identify factors that may contribute to the postoperative worsening of CAP. Methods Frequency-pattern, duration-pattern, and dichotic tests were performed before and after epilepsy surgery in 22 patients with normal hearing according to pure-tone audiometry. Results No significant difference in CAP scores was detected between pre- and postoperative tests, but there was a strong association between surgery in the language-dominant temporal lobe and postoperative worsening in the non-dominant-side dichotic test (p<0.05). The probability of a decreased performance in a non-dominant-side dichotic test after surgery was 7.5-fold greater in patients who underwent surgery on the dominant temporal lobe compared with the nondominant temporal lobe. No significant association of postoperative worsening in CAP with the verbal, nonverbal intelligence quotient, or right- or left-side lobectomy was noted. Conclusions These results suggest that ATL-AH on the dominant side in patients with mTLE-HS worsens the CAP ability in the non-dominant-side dichotic test.
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Affiliation(s)
- Su Hyun Han
- Department of Neurology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.,Department of Neurology, Chung-Ang University College of Medicine, Seoul, Korea
| | - Eun Mi Lee
- Department of Neurology, Ulsan University Hospital, College of Medicine, University of Ulsan, Ulsan, Korea
| | - Eun Ju Choi
- Department of Neurology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea
| | - Han Uk Ryu
- Department of Neurology, Jeonbuk University Hospital, College of Medicine, Jeonbuk University, Jeonju, Korea
| | - Joong Koo Kang
- Department of Neurology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.
| | - Jong Woo Chung
- Department of Otolaryngology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea
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Chatani H, Hagiwara K, Hironaga N, Ogata K, Shigeto H, Morioka T, Sakata A, Hashiguchi K, Murakami N, Uehara T, Kira JI, Tobimatsu S. Neuromagnetic evidence for hippocampal modulation of auditory processing. Neuroimage 2015; 124:256-266. [PMID: 26363346 DOI: 10.1016/j.neuroimage.2015.09.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 09/01/2015] [Accepted: 09/03/2015] [Indexed: 10/23/2022] Open
Abstract
The hippocampus is well known to be involved in memory, as well as in perceptual processing. To date, the electrophysiological process by which unilateral hippocampal lesions, such as hippocampal sclerosis (HS), modulate the auditory processing remains unknown. Auditory-evoked magnetic fields (AEFs) are valuable for evaluating auditory functions, because M100, a major component of AEFs, originates from auditory areas. Therefore, AEFs of mesial temporal lobe epilepsy (mTLE, n=17) with unilateral HS were compared with those of healthy (HC, n=17) and disease controls (n=9), thereby determining whether AEFs were indicative of hippocampal influences on the auditory processing. Monaural tone-burst stimuli were presented for each side, followed by analysis of M100 and a previously less characterized exogenous component (M400: 300-500ms). The frequency of acceptable M100 dipoles was significantly decreased in the HS side. Beam-forming-based source localization analysis also showed decreased activity of the auditory area, which corresponded to the inadequately estimated dipoles. M400 was found to be related to the medial temporal structure on the HS side. Volumetric analysis was also performed, focusing on the auditory-related areas (planum temporale, Heschl's gyrus, and superior temporal gyrus), as well as the hippocampus. M100 amplitudes positively correlated with hippocampal and planum temporale volumes in the HC group, whereas they negatively correlated with Heschl's gyrus volume in the mTLE group. Interestingly, significantly enhanced M400 component was observed in the HS side of the mTLE patients. In addition, the M400 component positively correlated with Heschl's gyrus volume and tended to positively correlate with disease duration. M400 was markedly diminished after hippocampal resection. Although volumetric analysis showed decreased hippocampal volume in the HS side, the planum temporale and Heschl's gyrus, the two major sources of M100, were preserved. These results suggested that HS significantly influenced AEFs. Therefore, we concluded that the hippocampus modulates auditory processing differently under normal conditions and in HS.
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Affiliation(s)
- Hiroshi Chatani
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan; Department of Neurology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Koichi Hagiwara
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Naruhito Hironaga
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Katsuya Ogata
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Hiroshi Shigeto
- Department of Neurology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Takato Morioka
- Department of Neurosurgery, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan; Department of Neurosurgery, Kyushu-Rosai Hospital, Kitakyushu 800-0296, Japan
| | - Ayumi Sakata
- Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Hospital, Fukuoka 812-8582, Japan
| | - Kimiaki Hashiguchi
- Department of Neurosurgery, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Nobuya Murakami
- Department of Neurosurgery, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Taira Uehara
- Department of Neurology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Jun-Ichi Kira
- Department of Neurology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Shozo Tobimatsu
- Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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Haneef Z, Lenartowicz A, Yeh HJ, Levin HS, Engel J, Stern JM. Functional connectivity of hippocampal networks in temporal lobe epilepsy. Epilepsia 2013; 55:137-45. [PMID: 24313597 DOI: 10.1111/epi.12476] [Citation(s) in RCA: 151] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/13/2013] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Temporal lobe epilepsy (TLE) affects brain areas beyond the temporal lobes due to connections of the hippocampi and other temporal lobe structures. Using functional connectivity magnetic resonance imaging (MRI), we determined the changes of hippocampal networks in TLE to assess for a more complete distribution of abnormality. METHODS Regions of interest (ROIs) were defined in the right and left hippocampi in three groups of participants: left TLE (n = 13), right TLE (n = 11), and healthy controls (n = 16). Brain regions functionally connected to these ROIs were identified by correlating resting-state low-frequency functional MRI (fMRI) blood oxygenation level-dependent (BOLD) signal fluctuations. The grouped results were compared using independent sample t-test. RESULTS TLE was associated with increased hippocampal connectivity involving several key areas of the limbic network (temporal lobe, insula, thalamus), frontal lobes, angular gyrus, basal ganglia, brainstem, and cerebellum, along with reduced connectivity involving areas of the sensorimotor cortex (visual, somatosensory, auditory, primary motor) and the default mode network (precuneus). Left TLE had more marked connectivity changes than right TLE. SIGNIFICANCE The observed connectivity changes in TLE indicate dysfunctional networks that underlie widespread brain involvement in TLE. There are identifiable differences in the connectivity of the hippocampi between left and right TLE.
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Affiliation(s)
- Zulfi Haneef
- Department of Neurology, Baylor College of Medicine, Houston, Texas, U.S.A; Department of Neurology, Michael E DeBakey VA Medical Center, Houston, Texas, U.S.A
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20
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Cervenka MC, Franaszczuk PJ, Crone NE, Hong B, Caffo BS, Bhatt P, Lenz FA, Boatman-Reich D. Reliability of early cortical auditory gamma-band responses. Clin Neurophysiol 2013; 124:70-82. [PMID: 22771035 PMCID: PMC3468656 DOI: 10.1016/j.clinph.2012.06.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 05/10/2012] [Accepted: 06/14/2012] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To evaluate the test-retest reliability of event-related power changes in the 30-150 Hz gamma frequency range occurring in the first 150 ms after presentation of an auditory stimulus. METHODS Repeat intracranial electrocorticographic (ECoG) recordings were performed with 12 epilepsy patients, at ≥1-day intervals, using a passive odd-ball paradigm with steady-state tones. Time-frequency matching pursuit analysis was used to quantify changes in gamma-band power relative to pre-stimulus baseline. Test-retest reliability was estimated based on within-subject comparisons (paired t-test, McNemar's test) and correlations (Spearman rank correlations, intra-class correlations) across sessions, adjusting for within-session variability. Reliability estimates of gamma-band response robustness, spatial concordance, and reproducibility were compared with corresponding measurements from concurrent auditory evoked N1 responses. RESULTS All patients showed increases in gamma-band power, 50-120 ms post-stimulus onset, that were highly robust across recordings, comparable to the evoked N1 responses. Gamma-band responses occurred regardless of patients' performance on behavioral tests of auditory processing, medication changes, seizure focus, or duration of test-retest interval. Test-retest reproducibility was greatest for the timing of peak power changes in the high-gamma range (65-150 Hz). Reliability of low-gamma responses and evoked N1 responses improved at higher signal-to-noise levels. CONCLUSIONS Early cortical auditory gamma-band responses are robust, spatially concordant, and reproducible over time. SIGNIFICANCE These test-retest ECoG results confirm the reliability of auditory gamma-band responses, supporting their utility as objective measures of cortical processing in clinical and research studies.
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Affiliation(s)
- Mackenzie C. Cervenka
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Piotr J. Franaszczuk
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Human Research and Engineering Directorate, U.S. Army Research Laboratory, Aberdeen Proving Ground, MD, USA
| | - Nathan E. Crone
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Bo Hong
- Department of Biomedical Engineering, Tsinghua University School of Medicine, Beijing, China
| | - Brian S. Caffo
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Paras Bhatt
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Frederick A. Lenz
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Dana Boatman-Reich
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Irsel Tezer F, Ilhan B, Erbil N, Saygi S, Akalan N, Ungan P. Lateralisation of sound in temporal-lobe epilepsy: comparison between pre- and postoperative performances and ERPs. Clin Neurophysiol 2012; 123:2362-9. [PMID: 22883476 DOI: 10.1016/j.clinph.2012.06.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 06/17/2012] [Accepted: 06/20/2012] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Our aim was to investigate if spatial hearing is impaired in mesial temporal lobe epilepsy and temporal lobectomy has an effect on this function. METHODS Thirteen patients with mesial temporal lobe epilepsy (TLE) due to sclerosis in their left (n=6) or right (n=7) hippocampus were studied. Their sound lateralisation performance indexed by d' was tested against that of a group of normal subjects (n=13). Patients' ERPs to lateralisation shifts induced by interaural disparities of intensity (IID) and time (ITD) were also recorded. Eight of the patients were re-tested after they underwent anterior temporal lobectomy, which involved the resection/removal of medial structures including amygdala, hippocampus and parahippocampal gyrus. RESULTS The sound-lateralisation performance of the TLE patients was significantly lower than normal subjects, and this disadvantage of the patients was specific to IID-based lateralisation. Amplitudes of their N1 and P2 responses to laterally shifting sounds were much lower than those reported previously for normal subjects. Lobectomy did not have a statistically significant effect on patients' sound-lateralisation performance nor on the amplitude of their auditory directional ERPs. CONCLUSIONS The results show that especially the IID-based sound-lateralisation performance is impaired in TLE patients and that lobectomy should not cause any further deterioration. SIGNIFICANCE This study suggests that a test for assessing the ability of sound lateralisation based on each of the IID and ITD cues should be included in the evaluation of TLE patients.
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Affiliation(s)
- F Irsel Tezer
- Hacettepe University, Faculty of Medicine, Department of Neurology, Ankara, Turkey.
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Aravindkumar R, Shivashankar N, Satishchandra P, Sinha S, Saini J, Subbakrishna DK. Temporal resolution deficits in patients with refractory complex partial seizures and mesial temporal sclerosis (MTS). Epilepsy Behav 2012; 24:126-30. [PMID: 22504057 DOI: 10.1016/j.yebeh.2012.03.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 03/05/2012] [Accepted: 03/06/2012] [Indexed: 11/18/2022]
Abstract
We studied the temporal resolution ability in patients with refractory complex partial seizures and mesial temporal sclerosis (MTS) using Gaps-In-Noise (GIN) test in a prospective cross-sectional study. Thirteen patients with right MTS (age: 31±7.67 years; M:F=8:5) and 13 patients with left MTS (age: 25.76±8.26 years; M:F=9:4) having normal hearing and mini-mental state examination (MMSE) score of >23/30 were recruited. Fifty healthy volunteers (26.3±5.17 years; M:F=28:22) formed the control group. Gaps-In-Noise test demonstrated impaired temporal resolution: 69.2% of patients with right MTS (RMTS) and 76.9% of patients with left MTS (LMTS) had abnormal scores in the right ear for gap detection threshold (GDT) measure. Similarly, 53.8% of patients in the RMTS group and 76.9% of patients in the LMTS group had abnormal scores in the left ear. In percentage of correct identification (PCI), 46.1% of patients with RMTS and 69.2% of patients with LMTS had poorer scores in the right ear, whereas 46.1% of patients with RMTS and 61.5% of patients with LMTS had poorer scores in the left ear. Both patient groups, viz., RMTS and LMTS, demonstrated bilateral temporal resolution deficits.
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Affiliation(s)
- Rajasekaran Aravindkumar
- Department of Speech Pathology and Audiology, National Institute of Mental Health and Neurosciences, Bangalore, India
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Cervenka MC, Nagle S, Boatman-Reich D. Cortical high-gamma responses in auditory processing. Am J Audiol 2012; 20:171-80. [PMID: 22158634 DOI: 10.1044/1059-0889(2011/10-0036)] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE This tutorial provides an introduction to cortical auditory spectral responses, focusing on event-related activity in the high-gamma frequencies (60-150 Hz), their recent emergence in neuroscience research, and potential clinical applications. METHOD Auditory high-gamma responses are described and compared with traditional cortical evoked responses, including the auditory evoked N1 response. Methods for acquiring and analyzing spectral responses, including time-frequency analyses, are discussed and contrasted with more familiar time-domain averaging approaches. Four cases are presented illustrating high-gamma response patterns associated with normal and impaired auditory processing. CONCLUSIONS Cortical auditory high-gamma responses may provide a useful clinical measure of auditory processing.
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