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Un mecanismo de circuito para diferenciar las asociaciones positivas y negativas
Praneeth Namburi1, Anna Beyeler2, Suzuko Yorozu3
11] The Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Neuroscience Graduate Program, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature
|May 1, 2015
Resumen
Comprender cómo la amígdala diferencia las emociones positivas y negativas es clave. Este estudio revela distintas vías neuronales en la amígdala basolateral (BLA) que controlan el miedo y el procesamiento de la recompensa.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- El procesamiento emocional.
- La plasticidad sináptica.
Sus antecedentes:
- El procesamiento emocional se basa en la diferenciación de estímulos positivos y negativos.
- El procesamiento emocional disfuncional está relacionado con trastornos psiquiátricos.
- El complejo de la amígdala basolateral (BLA) es crucial para la memoria asociativa, pero sus mecanismos neuronales para la diferenciación de valencia no están claros.
Objetivo del estudio:
- Identificar poblaciones neuronales distintas dentro del BLA responsables de codificar la valencia emocional positiva y negativa.
- Para dilucidar los mecanismos sinápticos que subyacen a la diferenciación de las asociaciones emocionales.
- Comprender el papel de las proyecciones neuronales BLA específicas en el condicionamiento del miedo y la recompensa.
Principales métodos:
- Investigaron las neuronas BLA que se proyectan hacia el núcleo accumbens (NAc) y la amígdala centromedial (CeM).
- Utilizó la optogenética (fotostimulación y fotoinhibición) para manipular la actividad neuronal durante el condicionamiento del miedo y la recompensa.
- Comparó las características electrofisiológicas, morfológicas y genéticas de distintas poblaciones neuronales BLA.
Principales resultados:
- Las neuronas BLA que se proyectan hacia los NAc (proyectores NAc) y CeM (proyectores CeM) exhiben plasticidad sináptica opuesta después del acondicionamiento.
- La fotoestimulación de los proyectores NAc promovió el refuerzo positivo, mientras que los proyectores CeM mediaron el refuerzo negativo.
- La inhibición de los proyectores CeM deterioró el condicionamiento del miedo y mejoró el condicionamiento de la recompensa.
Conclusiones:
- Las poblaciones neuronales funcionalmente distintas dentro del BLA codifican diferencialmente asociaciones emocionales positivas y negativas.
- Las vías de proyección BLA específicas (a NAc y CeM) son críticas para la mediación de distintas valencias emocionales.
- Esta investigación proporciona una explicación mecanicista de cómo la amígdala representa asociaciones positivas y negativas.
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