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Music lends itself to internet selling, says Nick Harrison of Mercer Management Consulting, because the customer either knows what he is after and can order online or else wants to browse a large range, which may not exist on the high street. But the dwindling profitability of music shops may ultimately limit that range. Peter Quicke, the managing director of Ninja Tune, a niche recording label, says stock-trimming by high-street stores is forcing firms to produce fewer albums and cut what they spend promoting new acts.

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Facing the music: three issues in current research on singing and aphasia

Subscribe now. Each week, over one million subscribers trust us to help them make sense of the world. Eight patients were singing and speaking novel lyrics in two conditions: alone solo word production , and together with a vocal playback choral word production. During solo word production, the number of intelligible words was independent of whether the patients were singing or speaking. During choral word production, the number of intelligible words was generally higher, with more sung than spoken words articulated correctly.

Based on these results, one may conclude that choral singing facilitates word production in aphasic patients. Taking a closer look at the experimental design, however, some details of the study are worth noting.

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The sung playback voice produced words only half as fast as the spoken playback voice. This difference also affected the patients' actual performance. Racette et al. This comparison reveals that the patients had more time to articulate well when they were singing to vocal playback. Without a doubt, the reported results suggest a facilitating effect of choral word production, whether sung or spoken.

However, the results do not necessarily indicate a benefit from choral singing. What seems like a choral singing effect may actually arise from differences in articulatory tempo. Using a similar research design, but controlling for articulatory tempo, a later study did not confirm an effect of choral singing over choral speech in 17 patients Stahl et al.

The consistent duration of sung and spoken syllables may be one of the reasons for this contrary finding. In summary, the control of articulatory tempo appears to be crucial in studies that seek to determine how different forms of vocal expression affect syllable production in patients with speech and language disorders.

Another issue concerns clinical studies that address the underlying mechanisms of music-based aphasia therapy. One seminal treatment study investigated the efficacy of Melodic Intonation Therapy Schlaug et al. A language test indicated that Melodic Intonation Therapy was more effective than a non-melodic control treatment in 2 chronic aphasic patients. Although the results may not generalize to a larger clinical population, they nonetheless provide evidence for the efficacy of Melodic Intonation Therapy in a group of chronic aphasic patients.

However, it is worth considering whether or not the results offer insight into the efficacy of any particular therapeutic element included in the program—such as singing—and its underlying neural mechanisms, as revealed by structural and functional imaging. It is important to note that Melodic Intonation Therapy includes various forms of vocal expression and multi-modal feedback: singing minor thirds; rhythmic speech with exaggerated prosody sprechgesang ; tactile rhythmic stimulation via hand tapping; choral word and phrase production; solo word and phrase repetition; auditory cueing of initial word and phrase syllables; and so on cf.

Helm-Estabrooks et al.

Given the number of stimulating elements used in Melodic Intonation Therapy, it is challenging to assess the contribution of each element to the efficacy of the entire program. This problem becomes especially apparent if one compares the composition of non-melodic control treatments and Melodic Intonation Therapy in clinical studies.

In the study mentioned above, the non-melodic control treatment did not include singing, rhythmic sprechgesang, and rhythmic hand tapping, whereas Melodic Intonation Therapy did cf. Schlaug et al. That is, the treatments did not only differ in singing, but also in other aspects of vocal expression and sensorimotor feedback.

Consequently, the results do not necessarily support the clinical efficacy of singing and its underlying neural mechanisms. What seems like a benefit from singing may actually be the effect of rhythm, prosody, tactile stimulation, or any of their combinations. Considering this range of possible interpretations, it is not a contradiction that a recent experiment did not confirm a long-term effect of singing over rhythmic speech in 10 chronic aphasic patients Stahl et al.

In summary, the interpretation of clinical results depends on whether the underlying research design focuses on music-based aphasia therapy as an entire program or on its specific mechanisms. One reason for the success of music-based aphasia therapy may be its use of common phrases. The phrases are stereotyped in form, tied to social context and, therefore, fall into the category of formulaic language Van Lancker Sidtis, This fact is critical: according to present knowledge, the production of formulaic language engages bilateral neural networks including right frontotemporal areas, the right basal ganglia and, possibly, the right cerebellum Hughlings-Jackson, ; Speedie et al.

The degree of right-hemisphere lateralization seems to be strongest for pragmatically oriented formulaic language: pause fillers, discourse elements, and conversational speech formulas Van Lancker Sidtis and Postman, It is intriguing to consider what these results may imply for clinical practice. Formulaic expressions may be viewed as a valuable language resource in patients with left-hemisphere lesions.

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Recent evidence suggests that standard speech-language therapy facilitates newly created utterances, while the massive repetition of conversational speech formulas leads to long-term progress in the production of trained phrases Stahl et al. Eight out of ten patients were able to establish their own individual formulaic repertoire to communicate some basic needs in daily life. Moreover, the therapeutic use of conversational speech formulas may have a motivating and rewarding effect, most notably in patients with extended left frontotemporal and subcortical lesions. Patients often report feeling competent if they are able to produce a few phrases correctly.

Finally, it is conceivable that even non-formulaic expressions become part of the formulaic repertoire by means of massive repetition: patients may eventually retrieve the trained phrases as a coherent unit from the mental lexicon, engaging bilateral or right-hemisphere neural networks cf.

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Wolf et al. The crucial role of formulaic language in music-based aphasia therapy challenges the interpretation of structural and functional neuroimaging data. Until recently, the sensitivity of right frontotemporal areas to Melodic Intonation Therapy has been presumed to result from the neural plasticity of non-formulaic language Schlaug et al.

However, the imaging data may also depend on the plasticity of right-hemisphere neural networks that support the production of formulaic language. What seems like a melody-mediated transfer of language function from the left to the right hemisphere may actually be the use of right-hemisphere language resources.

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Behavioral evidence for this claim comes from the finding that music-based aphasia therapy benefits the production of conversational speech formulas, irrespective of whether the patients are singing Stahl et al. In summary, future research needs to consider the possible interplay of music-based aphasia therapy and right-hemisphere neural networks engaged in the production of formulaic language. There is no doubt that music-based aphasia therapy—including Melodic Intonation Therapy—is a promising treatment for several types of speech and language disorders. The rhythmic elements of the program may help to overcome deficits in motor planning, commonly found in persons with apraxia of speech.

The training of formulaic and non-formulaic phrases may indirectly compensate for communicative difficulties associated with agrammatism, as is the case in persons with Broca's aphasia. The repetitive character of the program as well as the focus on a limited formulaic repertoire may be suitable to alleviate severe expressive and receptive symptoms, typically observed in persons with global aphasia. In other words, the use of melody-based aphasia therapy seems appropriate for a number of speech and language disorders.

To this day, research on music-based aphasia therapy has addressed the overall efficacy of current rehabilitation programs holistic approach and some of their underlying mechanisms analytic approach. Drawing on the findings from holistic approaches, the long-term goal of analytic research is to tailor future rehabilitation programs to the individual needs of the patients. This may increase the efficacy of the treatment to a considerable extent. One may argue that analytic research on music-based aphasia therapy is taking a reductionist view, for example, by disentangling the close relationship between melody and rhythm cf.

Merrett et al. Until now, however, analytic research on music-based aphasia therapy has actually compared singing—that is, the combined use of melody and rhythm—with other forms of vocal expression, including rhythmic speech. The available data are, therefore, consistent with the idea that rhythmicity is naturally inherent in singing. Still, analytic research on music-based aphasia therapy should not overshadow the valuable contribution of holistic approaches.

We believe that both holistic and analytic approaches are needed and usually depend on each other. Many clinical hypotheses are derived from analytic research and then tested in holistic designs, and vice versa. Acting in concert, holistic and analytic approaches may help to improve the quality of research in the field as well as the individual efficacy of music-based aphasia therapy.

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. National Center for Biotechnology Information , U. Journal List Front Psychol v.

Front Psychol. Published online Sep Kotz 2, 3. Sonja A. Author information Article notes Copyright and License information Disclaimer. This article was submitted to Cognitive Science, a section of the journal Frontiers in Psychology. Received Jul 7; Accepted Aug Keywords: left-hemisphere stroke, speech-language pathology, non-fluent aphasia, apraxia of speech, Melodic Intonation Therapy, singing, rhythmic pacing, formulaic language.

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