Video Experimental Relacionado
Updated: Feb 13, 2026

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Extinction Training During the Reconsolidation Window Prevents Recovery of Fear
Published on: August 24, 2012
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Coordinated activity and plasticity of infralimbic cortex GABAergic interneurons are critical for fear extinction
bioRxiv : the preprint server for biology
|February 12, 2026
Resumen
Fear extinction memory relies on dynamic changes in inhibitory interneurons within the infralimbic cortex (IL). Specific interneuron populations (parvalbumin and somatostatin) are crucial for suppressing fear and encoding new adaptive behaviors.
Área de la Ciencia:
- Neurociencia
- Neurociencia Conductual
- Neurociencia Celular
Sus antecedentes:
- La extinción de la memoria del miedo es vital para la supervivencia, ya que permite a los organismos adaptar su comportamiento después de que las amenazas han pasado.
- La corteza infralimbica (IL) en roedores es clave para suprimir las memorias del miedo desencadenadas por señales, pero sus mecanismos de circuito siguen sin estar claros.
Objetivo del estudio:
- Elucidar los mecanismos del circuito que rigen el reclutamiento y la función de las interneuronas inhibitorias del IL durante la extinción del miedo.
Principales métodos:
- Se utilizó inmunohistoquímica, etiquetado neuronal, imágenes de calcio in vivo, optogenética y electrofisiología de rodajas de cerebro.
- Se investigó la actividad dinámica y la plasticidad en las interneuronas del IL (parvalbúmina y somatostatina) y las proyecciones de la amígdala basolateral.
Principales resultados:
- El condicionamiento del miedo aumenta la actividad y la plasticidad en las interneuronas de parvalbúmina del IL, lo que mejora la congelación.
- La extinción del miedo involucra a las interneuronas de somatostatina del IL, que inhiben a las interneuronas de parvalbúmina y desinhiben a las neuronas principales, facilitando la memoria de extinción.
Conclusiones:
- La actividad dinámica y la plasticidad de las interneuronas inhibitorias del IL son críticas para la codificación de la extinción del miedo.
- La plasticidad específica de tipo celular en los microcircuitos del IL y las proyecciones de la amígdala basolateral orquestan la memoria de extinción del miedo.
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