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Musical Brains. A study of evoked musical sensations without external auditory stimuli. Preliminary report of three cases.

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Author(s): Goycoolea, Marcos V. | Neubauer, Sonia G. | Mena, Ismael. | Levy, Raquel G. | Fernández Grez, Margarita. | Berger, Claudia G.

Journal: Alasbimn Journal
ISSN 0717-4055

Volume: 8;
Issue: 33;
Date: 2006;
Original page

Keywords: Auditory cortex | auditory memory | auditory stimulation | hemisphere dominance | single photon emission computed tomography | (SPECT) | hexamethyl-propylenamine-oxime | HMPAO.

ABSTRACT
BackgroundThere are individuals, usually musicians, who are seemingly able to evoke musical sensations without external auditory stimuli. However, to date there is no available evidence to determine if it is feasible to have musical sensations without using external sensory receptors nor if there is a biological substrate to these sensations.Study designTwo single photon emission computerized tomography (SPECT) evaluations with [99mTc]-HMPAO were conducted in each of three female musicians. One was done under basal conditions (without evoking) and the other one while evoking these sensations.ResultsIn the NeuroSPECT studies of the musicians who were tested while evoking a musical composition, there was a significant increase in perfusion above the normal mean in the right and left hemispheres in Brodmann’s areas 9 and 8 (frontal executive area) and in areas 40 on the left side (auditory center). However, under basal conditions there was no hyperperfusion of areas 9, 8, 39 and 40. In one case hyperperfusion was found under basal conditions in area 45, however it was less than when she was evoking.ConclusionsThese findings are suggestive of a biological substrate to the process of evoking musical sensations.Existen personas, generalmente músicos, que tienen la capacidad de evocar sensaciones musicales sin un estímulo auditivo externo. Sin embargo, hasta la fecha no hay evidencias que sugieran que sea posible tener estas sensaciones, ni que exista un sustrato biológico para ellas.Diseño del trabajoSe hicieron dos estudios de neuroSPECT con [99mTc]-HMPAO en cada una de tres mujeres músicos. El primer estudio fue hecho en condiciones basales (sin evocar) y el segundo mientras estaban evocando sensaciones musicales.ResultadosEn el estudio de las voluntarias que fueron evaluadas mientras evocaban una composición musical, hubo un aumento significativo de perfusión en los hemisferios derecho e izquierdo en las áreas de Brodmann 9 y 8 (área ejecutiva frontal) y en el área 40 en el lado izquierdo (área auditiva). Sin embargo, en condiciones basales no hubo aumento de perfusión en las áreas 9, 8, 39 y 40. En un caso hubo mayor aumento de perfusión en el área 45 durante la autoevocación respecto a la condición basal.ConclusionesEstos hallazgos son sugerentes de un sustrato biológico para el proceso de evocar sensaciones musicales.
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