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Inicio Acta Otorrinolaringológica Española Results of a functional magnetic resonance study of the primary auditory cortex ...
Journal Information
Vol. 60. Issue 3.
Pages 160-168 (January 2009)
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Vol. 60. Issue 3.
Pages 160-168 (January 2009)
Results of a functional magnetic resonance study of the primary auditory cortex (I): general characteristics and individual outcomes
Resultados en el estudio del córtex auditivo mediante resonancia magnética funcional (I): características generales y resultados individuales
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Luis M. Menéndez-Colinoa,
Corresponding author
, Josep Traserrab, Carles Falcónc, Joan Berenguerd, Teresa Pujold, Joan Doménechb, Manuel Bernal-Sprekelsenb
a Servicio de Otorrinolaringología, Hospital Virgen de la Salud, Toledo, Spain
b Servicio de Otorrinolaringología, Hospital Clínic, Barcelona, Spain
c Unidad de Resonancia Magnética Funcional, Universidad de Barcelona, Barcelona, Spain
d Centro de Diagnóstico por la Imagen (CDI), Hospital Clínic, Barcelona, Spain
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Abstract
Objective

To demonstrate and investigate the activation patterns of the primary auditory cortex (Heschl's gyrus) using functional magnetic resonance imaging (fMRI).

Material and methods

Pure tone stimuli at 750Hz and 2000Hz were delivered to the right and left ear of 32 normal-hearing volunteers (18–49 years old) in 20-second on-off cycles. The fMRI data were obtained using a 1.5 Tesla scanner and processed with SPM2.

Results

For both tone frequencies, bilateral hemispheric activation was identified in the transverse temporal gyrus (Heschl's gyrus) in 29 subjects (90.62%) in response to pure tone stimuli with a probability level of P<.001. For monaural stimulation, bilateral hemispheric activation was observed with generally greater extent of activation in the Heschl's gyrus (HG) contralateral to the stimulated ear.

Conclusions

These results demonstrate that fMRI is a useful imaging technique to investigate the auditory cortex. The contralateral auditory cortex is more responsive than the ipsilateral cortex to tones presented monaurally.

Keywords:
Functional magnetic resonance
Auditory pathways
Auditory cortex
Hearing
Resumen
Objetivo

Investigar y demostrar los modelos de activación en el córtex auditivo primario mediante la resonancia magnética funcional (RMf).

Material y métodos

Se estimuló la audición, a 32 voluntarios normooyentes (intervalo de edad, 18–49 años), con tonos de 750 y 2.000Hz en ciclos de 20 s de estimulación, seguidos por 20 s de reposo. Se empleó un escáner de RM de 1,5 T y la herramienta estadística SPM2.

Resultados

Para ambas frecuencias (750 y 2.000Hz) en 29 de 32 sujetos (9.62%) se registró una activación cortical auditiva en la circunvolución de Heschl de ambos hemisferios con una p<0,001. Ante la estimulación auditiva monoaural se ha registrado una activación cortical auditiva bilateral que, generalmente, fue mayor en el hemisferio contralateral al oído estimulado.

Conclusiones

Estos resultados demuestran que la RMf es una técnica de imagen útil para la investigación del córtex auditivo. La estimulación monoaural con tonos puros activa, predominantemente, el córtex auditivo contralateral.

Palabras clave:
Resonancia magnética funcional
Vía auditiva
Córtex auditivo
Audición

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