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Abstract Title:

Insight into the neurophysiological processes of melodically intoned language with functional MRI.

Abstract Source:

Brain Behav. 2014 Sep ;4(5):615-25. Epub 2014 Jul 3. PMID: 25328839

Abstract Author(s):

Carolina P Méndez Orellana, Mieke E van de Sandt-Koenderman, Emi Saliasi, Ineke van der Meulen, Simone Klip, Aad van der Lugt, Marion Smits

Article Affiliation:

Carolina P Méndez Orellana


BACKGROUND: Melodic Intonation Therapy (MIT) uses the melodic elements of speech to improve language production in severe nonfluent aphasia. A crucial element of MIT is the melodically intoned auditory input: the patient listens to the therapist singing a target utterance. Such input of melodically intoned language facilitates production, whereas auditory input of spoken language does not.

METHODS: Using a sparse sampling fMRI sequence, we examined the differential auditory processing of spoken and melodically intoned language. Nineteen right-handed healthy volunteers performed an auditory lexical decision task in an event related design consisting of spoken and melodically intoned meaningful and meaningless items. The control conditions consisted of neutral utterances, either melodically intoned or spoken.

RESULTS: Irrespective of whether the items were normally spoken or melodically intoned, meaningful items showed greater activation in the supramarginal gyrus and inferior parietal lobule, predominantly in the left hemisphere. Melodically intoned language activated both temporal lobes rather symmetrically, as well as the right frontal lobe cortices, indicating that these regions are engaged in the acoustic complexity of melodically intoned stimuli. Compared to spoken language, melodically intoned language activated sensory motor regions and articulatory language networks in the left hemisphere, but only when meaningful language was used.

DISCUSSION: Our results suggest that the facilitatory effect of MIT may - in part - depend on an auditory input which combines melody and meaning.

CONCLUSION: Combined melody and meaning provide a sound basis for the further investigation of melodic language processing in aphasic patients, and eventually the neurophysiological processes underlying MIT.

Study Type : Review
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