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La ecolocalización en murciélagos: el oído externo y la percepción de las posiciones verticales de los objetivos
Science (New York, N.Y.)
|October 29, 1982
Resumen
Los murciélagos ecolocadores, como el gran murciélago marrón (Eptesicus fuscus), usan sus estructuras auditivas externas para detectar con precisión ángulos verticales de sonido. El trago y el pino crean ecos que codifican esta información direccional crucial.
Área de la Ciencia:
- La bioacústica es la bioacústica.
- La neurociencia auditiva es una neurociencia auditiva.
- Comportamiento animal Comportamiento animal.
Sus antecedentes:
- Los murciélagos ecolocadores poseen una notable agudeza auditiva espacial.
- Las estructuras del oído externo juegan un papel crítico en la modificación del sonido para el procesamiento auditivo.
- Comprender los mecanismos de la percepción espacial del biosonar es clave para la neurociencia auditiva.
Objetivo del estudio:
- Investigar el papel del oído externo, específicamente el trago y el pino, en la percepción de ángulo vertical de los murciélagos ecolocadores.
- Para determinar cómo las modificaciones en el oído externo afectan la capacidad del murciélago para discernir la elevación de la fuente de sonido.
Principales métodos:
- Los experimentos consistieron en evaluar la agudeza de percepción de ángulo vertical del gran murciélago marrón (Eptesicus fuscus) utilizando pares de varillas horizontales.
- El estudio alteró sistemáticamente las estructuras del oído externo, particularmente el trago, para observar el impacto en el rendimiento auditivo.
- Se realizaron análisis acústicos para comprender la generación de eco y el momento relacionado con la morfología del oído externo.
Principales resultados:
- Los murciélagos ecolocadores demostraron una alta agudeza, percibiendo cambios de ángulo vertical tan pequeños como 3 grados.
- La desviación del trago degradó significativamente la percepción del ángulo vertical, aumentando el umbral a 12-14 grados.
- Se descubrió que la estructura pinna-tragus produce un eco secundario, con su retraso que codifica la ubicación vertical de la fuente de sonido.
Conclusiones:
- El oído externo, particularmente el complejo pinna-tragus, es esencial para la percepción de ángulo vertical de alta agudeza en los murciélagos ecolocadores.
- La sincronización de los ecos secundarios generados por el oído externo es un código neural crítico para la localización vertical del sonido.
- Estos hallazgos aclaran un mecanismo clave que subyace a las sofisticadas capacidades biosonares de los murciélagos.
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