Neural correlates of the Heidelberg Music Therapy: indicators for the regeneration of auditory cortex in tinnitus patients?
Identifieur interne : 000004 ( Pmc/Corpus ); précédent : 000003; suivant : 000005Neural correlates of the Heidelberg Music Therapy: indicators for the regeneration of auditory cortex in tinnitus patients?
Auteurs : Christoph M. Krick ; Heike ArgstatterSource :
- Neural Regeneration Research [ 1673-5374 ] ; 2015.
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DOI: 10.4103/1673-5374.165220
PubMed: 26604883
PubMed Central: 4625488
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Neural correlates of the Heidelberg Music Therapy: indicators for the regeneration of auditory cortex in tinnitus patients?</title><author><name sortKey="Krick, Christoph M" sort="Krick, Christoph M" uniqKey="Krick C" first="Christoph M." last="Krick">Christoph M. Krick</name><affiliation><nlm:aff id="aff1">Department of Neuroradiology, Saarland University Hospital, D-66241 Homburg, Germany</nlm:aff></affiliation></author><author><name sortKey="Argstatter, Heike" sort="Argstatter, Heike" uniqKey="Argstatter H" first="Heike" last="Argstatter">Heike Argstatter</name><affiliation><nlm:aff id="aff2">German Center for Music Therapy Research (Viktor Dulger Institute) DZM, D-69123 Heidelberg, Germany</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26604883</idno><idno type="pmc">4625488</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4625488</idno><idno type="RBID">PMC:4625488</idno><idno type="doi">10.4103/1673-5374.165220</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000004</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000004</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Neural correlates of the Heidelberg Music Therapy: indicators for the regeneration of auditory cortex in tinnitus patients?</title><author><name sortKey="Krick, Christoph M" sort="Krick, Christoph M" uniqKey="Krick C" first="Christoph M." last="Krick">Christoph M. Krick</name><affiliation><nlm:aff id="aff1">Department of Neuroradiology, Saarland University Hospital, D-66241 Homburg, Germany</nlm:aff></affiliation></author><author><name sortKey="Argstatter, Heike" sort="Argstatter, Heike" uniqKey="Argstatter H" first="Heike" last="Argstatter">Heike Argstatter</name><affiliation><nlm:aff id="aff2">German Center for Music Therapy Research (Viktor Dulger Institute) DZM, D-69123 Heidelberg, Germany</nlm:aff></affiliation></author></analytic><series><title level="j">Neural Regeneration Research</title><idno type="ISSN">1673-5374</idno><idno type="eISSN">1876-7958</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Argstatter, H" uniqKey="Argstatter H">H Argstatter</name></author><author><name sortKey="Grapp, M" uniqKey="Grapp M">M 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uniqKey="Hoare D">DJ Hoare</name></author><author><name sortKey="Adjamian, P" uniqKey="Adjamian P">P Adjamian</name></author><author><name sortKey="Sereda, M" uniqKey="Sereda M">M Sereda</name></author><author><name sortKey="Hall, Da" uniqKey="Hall D">DA Hall</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hutter, E" uniqKey="Hutter E">E Hutter</name></author><author><name sortKey="Grapp, M" uniqKey="Grapp M">M Grapp</name></author><author><name sortKey="Argstatter, H" uniqKey="Argstatter H">H Argstatter</name></author><author><name sortKey="Bolay, Hv" uniqKey="Bolay H">HV Bolay</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Krick, Cm" uniqKey="Krick C">CM Krick</name></author><author><name sortKey="Grapp, M" uniqKey="Grapp M">M Grapp</name></author><author><name sortKey="Daneshvar Talebi, J" uniqKey="Daneshvar Talebi J">J Daneshvar-Talebi</name></author><author><name sortKey="Reith, W" uniqKey="Reith W">W Reith</name></author><author><name sortKey="Plinkert, Pk" uniqKey="Plinkert P">PK Plinkert</name></author><author><name sortKey="Bolay, Hv" uniqKey="Bolay H">HV Bolay</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lefaucheur, Jp" uniqKey="Lefaucheur J">JP Lefaucheur</name></author><author><name sortKey="Andre Obadia, N" uniqKey="Andre Obadia N">N André-Obadia</name></author><author><name sortKey="Antal, A" uniqKey="Antal A">A Antal</name></author><author><name sortKey="Ayache, Ss" uniqKey="Ayache S">SS Ayache</name></author><author><name sortKey="Baeken, C" uniqKey="Baeken C">C Baeken</name></author><author><name sortKey="Benninger, Dh" uniqKey="Benninger D">DH Benninger</name></author><author><name sortKey="Garcia Larrea, L" uniqKey="Garcia Larrea L">L Garcia-Larrea</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Schecklmann, M" uniqKey="Schecklmann M">M Schecklmann</name></author><author><name sortKey="Lehner, 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Neural Regen Res</journal-id><journal-id journal-id-type="iso-abbrev">Neural Regen Res</journal-id><journal-id journal-id-type="publisher-id">NRR</journal-id><journal-title-group><journal-title>Neural Regeneration Research</journal-title></journal-title-group><issn pub-type="ppub">1673-5374</issn><issn pub-type="epub">1876-7958</issn><publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name><publisher-loc>India</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26604883</article-id><article-id pub-id-type="pmc">4625488</article-id><article-id pub-id-type="publisher-id">NRR-10-1373</article-id><article-id pub-id-type="doi">10.4103/1673-5374.165220</article-id><article-categories><subj-group subj-group-type="heading"><subject>Perspective</subject></subj-group></article-categories><title-group><article-title>Neural correlates of the Heidelberg Music Therapy: indicators for the regeneration of auditory cortex in tinnitus patients?</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Krick</surname><given-names>Christoph M.</given-names></name><degrees>Ph.D.</degrees><xref ref-type="aff" rid="aff1"></xref><xref ref-type="corresp" rid="cor1">*</xref></contrib><contrib contrib-type="author"><name><surname>Argstatter</surname><given-names>Heike</given-names></name><xref ref-type="aff" rid="aff2"></xref></contrib></contrib-group><aff id="aff1">Department of Neuroradiology, Saarland University Hospital, D-66241 Homburg, Germany</aff><aff id="aff2">German Center for Music Therapy Research (Viktor Dulger Institute) DZM, D-69123 Heidelberg, Germany</aff><author-notes><corresp id="cor1"><label>*</label><italic><bold>Correspondence to:</bold> Christoph M. Krick, <email xlink:href="christoph.krick@uniklinikum-saarland.de">christoph.krick@uniklinikum-saarland.de</email></italic>.
</corresp></author-notes><pub-date pub-type="ppub"><month>9</month><year>2015</year></pub-date><volume>10</volume><issue>9</issue><fpage>1373</fpage><lpage>1375</lpage><history><date date-type="accepted"><day>16</day><month>6</month><year>2015</year></date></history><permissions><copyright-statement>Copyright: © Neural Regeneration Research</copyright-statement><copyright-year>2015</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.</license-p></license></permissions></article-meta></front><body><p>Tinnitus, the phenomenon of ringing or buzzing in the ears without an external sound source is one of the most commonly reported symptoms in otorhinolaryngology and affects 10 – 15% of the general population. Models have been developed to account for neural basis of tinnitus, its pathogenesis and its consequences on mental health (deRidder et al., 2013). In most cases tinnitus onset follows a partial hearing impairment. Peripheral sensory deprivation due to cochlear damages may prompt increased neuronal activity in the central auditory system in order to adapt the neural sensitivity to the reduced sensory inputs. This central gain could over amplify the “neural noise” and thus trigger a homeostatic down-regulation of inhibitory synapses in the auditory cortical map leading to specific reorganization of the cortical representation of the tinnitus percept. Dysfunctional feedback connections from limbic regions to auditory brain areas, interacting at the thalamic level, may account for the psychological impairment.</p><p>Tinnitus research has led to a variety of prospective treatment options. Most promising of these are treatments which incorporate psychotherapeutic elements and auditory stimulation procedures (Grewal et al., 2014). However, the meaning of “therapy success” does not imply complete disappearance of the tinnitus sound. The aim of tinnitus-related interventions is the attenuation of the tinnitus percept and/or habituation processes to decrease the psychological suffering. There is as yet no permanent treatment for a neural down-regulation of processes maintaining this auditory self-excitation. On the website of the American Tinnitus Association (ATA) it states: “<italic>We know you are looking for a cure to end that suffering. But we want to tell you that no matter what anyone tells you, there is currently no cure for the condition.</italic>”</p><p>Schecklmann et al. (2013) showed that the extent of tinnitus distress is correlated with gray matter (GM) loss in the auditory cortex during ongoing tinnitus percept. This finding was derived from a large cross-sectional sample of 257 patients suffering from chronic tinnitus and it was replicated in a second sample of additional 78 patients. As tinnitus impact causes GM loss in auditory cortex, inverse changes in the same areas seem plausible for tinnitus treatment. Although such reorganization may alleviate the phantom sound sensation, its realization seems futuristic. Since the brain is an informationally isolated system, managing brain functions externally has only small or transient effects. Thus commonly used masker devices come with the disadvantage of lengthy application and they only offer the passive “sounding” of the tinnitus as long as they were applied. One way to affect the brain may be the therapeutic use of repetitive transcranial magnetic stimulation (rTMS). The effects of rTMS on the left temporoparietal cortex in tinnitus patients has been shown to be temporary effective (Lefaucheur et al. 2014). Another approach consists of therapeutic regimes aiming at neuronal reorganization by means of neuro-psychotherapeutic interventions that use principles of neural self-organization. The tinnitus’ self-excitation seems best accessible by inner neural pathways of acoustic learning, attention control, and emotional processing.</p><p>Sound therapies may also alleviate the perception of tinnitus (Hoare et al. 2013). Their underlying notion is the desynchronization of the pathologically increased neuronal synchrony leading to tonotopic changes in the auditory cortex using music. The German Center for Music Therapy Research (DZM e.V.) promotes a music therapeutic approach: the Heidelberg Model of Neuro-Music Therapy. It stems from a ten-year effort of therapy development and its evaluation using questionnaires, electrophysiological examination and Magnet Resonance Imaging (MRI). The Neuro-Music Therapy integrates a number of strategies to manage the psychological state of the patient and to restore the underlying neuronal circuits. To do so, complementary music- and psychotherapeutic interventions and techniques are structured into modules. The therapy protocol consists of nine 5-minute sessions of individualized therapy over a period of five consecutive days, comprising acoustic training for frequency discrimination, auditory attention control tasks, and guided exercises for mindfulness and distress regulation. A detailed description of the therapy can be found in Argstatter et al. (2015). Compared to sound-based approaches using passive listening, during the Heidelberg Neuro-Music Therapy the patients are confronted actively with their individual tinnitus sounds. There are five important strategies: (i) The patients are told to focus on their tinnitus explicitly instead of trying to ignore it; (ii) the music therapy makes use of specific tonal material, matched to the individual's tinnitus frequency; (iii) the main parts of the therapy consist of active music therapy modules, meaning that there is no need and no purpose for spectrally changing the music used, which facilitates the application of the treatment considerably; (iv) it is important to ensure the training regime is intrinsically motivating and active music therapy guarantees the lasting co-operation of the patients forcing self-organization processes in the brain; and (v) the duration of the music therapy does not exceed 5 consecutive training days and is thus extremely short. However, this therapy is limited to patients without severe hearing impairment allowing the participation in the musically guided sessions.</p><p>Over 1,200 patients suffering from chronic tinnitus have undergone the Neuro-Music Therapy in the last 10 years. Overall, about 80% of them experienced a reliable improvement of symptoms (’responder’), both in participants in controlled clinical trials and in participants in daily clinical sessions in the outpatient department at the DZM e.V. The therapy has shown long-term effects despite the short intervention interval (Argstatter et al., 2012). Similar clinical therapeutic effects in patients with recent onset tinnitus have been reported by Grapp et al. (2013).</p><p>The previously observed long-term effects of the Heidelberg Neuro-Music Therapy have led to the hypothesis that structural reorganization can be expected as a neural correlate of clinical improvement. High resolution MRI scans were performed on two subsequent weekends to investigate longitudinal structural changes (Krick et al., 2015). Tinnitus-related mental load, <italic>i.e</italic>., distress, was measured using the Tinnitus Questionnaire (TQ) (Goebel and Hiller, 1998) before and after therapy. At the time of including the patients, they reported mean strain of 37.3 ± 16.1 points on TQ scale. Time since tinnitus onset was 4.9 ± 2.1 weeks. The patients first underwent standard clinical treatment for acute tinnitus. Cases with tinnitus remission during this phase were excluded from further therapy. Finally 41 patients still suffering from the recent onset tinnitus accepted to undergo the Neuro-Music therapy. In order to observe therapy-related effects, the patients were randomly divided into two groups, a treatment group (TG) and a waiting group of passive tinnitus controls (PTC). Tinnitus distress and tinnitus duration was controlled in both groups. At the time of MRI, mean tinnitus duration was 8.14 ± 1.85 weeks in TG and 8.10 ± 1.45 weeks in the PTC group. Twenty-two healthy participants also underwent the music therapy as active controls (AC) in order to analyze the tinnitus-related therapy effects by comparing the scans with the treatment group. All participants had age-appropriate hearing levels and reported no otological or psychological comorbidity. The three groups did not differ in sex (females 43%) or age (mean 41.6 ± 11.8 years).</p><p>Between the MRI sessions with delay of 1 week, the treatment group and the active controls were treated with the Neuro-Music therapy according to the Heidelberg Model. Participants in the PTC group did not receive any intervention during the study week (but after). On the psychological level, the therapy significantly reduced the TQ score in the treatment group compared to the PTC group (<italic>df</italic> = 1; <italic>F</italic> = 22.9; MSE = 1,374; <italic>P</italic> < 0.00005). Brain reorganization was calculated by longitudinal Voxel-Based Morphometry (VBM). The influence of the treatment on GM density was contrasted between the groups using a repeated measures analysis of variance. Therapy-induced GM changes were derived from the contrast between the treatment group and the PTC. Specific tinnitus-related GM changes were calculated from contrast between the treatment group and active controls, each experiencing the same treatment, respectively. In both groups the 1-week therapy yielded GM increase in the precuneus (see <xref ref-type="fig" rid="F1"><bold>Figure 1</bold></xref>) which is involved in the neural network for self-perception and distress regulation (de Ridder et al. 2013). Only the treatment group showed a GM increase in the right primary auditory cortex, comprising the right Heschl's gyrus (see <xref ref-type="fig" rid="F1"><bold>Figure 1</bold></xref>). The intersection between specific tinnitus-related structural effects and therapy-induced brain alterations revealed a significant right-lateralized GM increase in the right auditory cortex, especially in the location of the right Heschl's gyrus (MNI coordinates 44/–12/–5) as shown in <xref ref-type="fig" rid="F2"><bold>Figure 2A</bold></xref>. This specific tinnitus-related structural GM increase and the TQ reduction led to the hypothesis that the therapy inversely involved the distress-sensitive auditory structures as described by Schecklmann et al. (2013). The localization of this specific improvement-related structural enhancement is partially in line with the findings of Schecklmann et al. (2013) which were located in similar coordinates (left: 44/–12/-11, right: 46/–15/–6). However, this structural overlap concerns the right hemisphere only. It is worth noting that the sign of slope was inverted between both observations.</p><fig id="F1" position="float"><label>Figure 1</label><caption><p>Both TG and AC experienced hearing exercises and relaxation techniques over 1 week.</p><p>In TG, compared to non-treated PTC therapy-induced GM increase was found in the precuneus (<italic>T</italic>=4.08; <italic>df</italic> = 39; <italic>P</italic> < 0.0005) and in the right Heschl's gyrus (<italic>T</italic> = 3.38; <italic>df</italic> = 39; <italic>P</italic> < 0.005). A tinnitus-specific therapy effect was observed in the TG's Heschl's gyrus by GM increase compared to AC (<italic>T</italic> = 3.21; <italic>df</italic> = 41; <italic>P</italic> < 0.005). In AC some effect was seen in the precuneus (<italic>T</italic> = 2.09; <italic>df</italic> = 40; <italic>P</italic> < 0.05) compared to PTC only. AC: Active controls; df: degrees of freedoms; GM: gray matter; PTC: passive tinnitus controls; TG: treatment group.</p></caption><graphic xlink:href="NRR-10-1373-g001"></graphic></fig><fig id="F2" position="float"><label>Figure 2</label><caption><p>Specific therapy effect.</p><p>(A) Localization of tinnitus-related effects among therapy-related GM changes in the right Heschl's gyrus (cross hairs) by intersection contrast (TG > AC) ∩ (TG > PTC) using VBM analysis (<italic>Z</italic> = 4.8; <italic>P</italic> < 0.05 after FWE correction on cluster level). (B) Regarding all tinnitus patients, the extent of structural reorganization was inversely correlated with the relative TQ change in this area (Spearman-Rho = –0.59; <italic>P</italic> < 0.0001). Circles: TG; squares: PTC. AC: Active controls; FWE: Family Wise Error; GM: gray matter; PTC: passive tinnitus controls; TG: treatment group; TQ: Tinnitus Questionnaire; VBM: voxel-based morphometry.</p></caption><graphic xlink:href="NRR-10-1373-g002"></graphic></fig><p>In the current study, we also aimed to describe the corresponding neural correlates of the distress dependency of the primary auditory cortex in tinnitus patients more thoroughly. Beyond the structural group differences as detailed in Krick et al. (2015) we therefore focused on individual changes of distress and GM, too. The rate of TQ decrease was inversely correlated (Spearman-Rho= –0.59; <italic>P</italic> < 0.0001) with the GM increase at the right Heschl's gyrus (see <xref ref-type="fig" rid="F2"><bold>Figure 2B</bold></xref>). A regression analysis with the dependent value of individual GM change in the Heschl's gyrus revealed significant influences from relative TQ change only, but there was no interaction with age, gender, or initial TQ. The resulting regression model (<italic>F</italic> = 4.35; <italic>df</italic> = 4; <italic>P</italic> < 0.01) can explain about 33% of the variance regarding the magnitude of reorganization in the right Heschl's gyrus. This result underlines the general relationship between tinnitus distress and GM density in the auditory cortex by means of longitudinal measurements. These results are compatible with the cross-sectional findings reported by Schecklmann et al. (2013), but they also provide insight into the speed of the reorganization process.</p><p>The observations regarding distress-related GM loss in the auditory cortex and the therapy-induced GM increase could be viewed as two sides of the same coin. The two inversely related effects concern the same brain structure that is involved in both tinnitus distress and its clinical improvement. In each case, the self-perceived tinnitus distress seemed to be dependent on the extent of gray matter changes in the auditory cortex. Although the processes on cellular level cannot be identified by the current methods, the macroscopic structural effects may have reversed the pathophysiological generation of tinnitus distress located within the auditory areas. Further evidence for the involvement of the auditory areas comes from the common observation that the phantom noise changes its pitch before it begins to mute in the course of the Neuro-Music Therapy (Hutter et al., 2014).</p><p>The finding of lateralized structural brain changes are difficult to account for, though they may be explained by the therapy strategies applied in the Neuro-Music Therapy that is tailored to the individual's tinnitus pitch. Since spectral processing of the acoustic percept predominantly involves right auditory areas (Doeller et al., 2003), there is an interplay with the main components of the training that depend on the patients’ ability to discriminate auditory stimuli. This current limitation to right dominant effects yields potential for future development.</p><p>The results of structurally managing the auditory cortex may open a door to new strategies towards remission of tinnitus-based brain irritations, though only a small percentage of patients reported a complete remission of their tinnitus sensation. However, the observed reorganization of the crucial auditory brain region, which was once impaired by tinnitus, may now yield an explanatory model for the sustained therapy success. Regarding our patients’ suffering from recent-onset tinnitus, it seems that the prolonged therapy effects caused by neural reorganization may be able to prevent tinnitus from chronification (Grapp et al., 2013).</p><p>In conclusion, this musically guided therapy option may lead to the rapid neural regeneration of the tinnitus core by distinct focal reorganization of the underlying neural circuits. Thus, these indicators of auditory cortical map regeneration give hope that the statement with respect to a cure for tinnitus on the American Tinnitus Association website may need to be revised some day.</p><p><italic>The study was supported by KTS Klaus Tschira Stiftung gGmbH. 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