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Las oscilaciones beta y gamma altas en la red cortico-strial reflejan la certeza de recompensa en una tarea de
Miranda F Koloski1,2,3, Morteza Salimi1,2, Sidharth Hulyalkar1,2
1Mental Health Service, VA San Diego Healthcare Syst., La Jolla, CA, 92161.
Resumen
Las oscilaciones cerebrales en la banda de frecuencia beta son cruciales para el aprendizaje del valor de la recompensa y la adaptación a las probabilidades cambiantes de recompensa en la red cortico-strial. Interrumpir estas oscilaciones puede conducir a comportamientos inadaptados.
Área de la Ciencia:
- La neurociencia
- Neurociencia computacional
- Neurociencia del comportamiento
Sus antecedentes:
- La toma de decisiones flexible se basa en la adaptación a la retroalimentación de recompensa incierta.
- Los circuitos cortico-striatales están implicados en la toma de decisiones, pero su papel preciso en el aprendizaje de la recompensa es complejo.
- Las tareas de aprendizaje inverso probabilístico (PRL) evalúan la capacidad de aprender y adaptarse a las contingencias de recompensa cambiantes.
Objetivo del estudio:
- Investigar el papel de las redes cortico-striatales en la retroalimentación de recompensa durante las tareas de PRL utilizando potenciales locales de campo.
- Identificar dinámicas oscilatorias específicas asociadas con el valor de la recompensa y la adaptación del comportamiento.
- Para determinar cómo la modulación de la actividad neuronal afecta el rendimiento de la tarea.
Principales métodos:
- Potenciales de campo locales registrados (32-CH) en ratas macho Long-Evans durante una tarea PRL.
- Se analizaron las oscilaciones evocadas por la recompensa a frecuencias beta (15-30Hz) y gamma altas (>70Hz).
- Utilizó la optogenética para modular la actividad beta en la corteza orbitofrontal.
- Empleó un modelo computacional de aprendizaje por refuerzo para analizar el comportamiento.
Principales resultados:
- Las oscilaciones beta y gamma altas evocadas por la recompensa reflejaron la valencia y probabilidad de recompensa positiva.
- La actividad de la frecuencia beta y la conectividad entre las regiones cortico-striatales se correlacionan con el rendimiento conductual.
- La estimulación optogenética de la corteza orbitofrontal en frecuencias beta promovió un comportamiento desadaptativo durante las respuestas no objetivo.
Conclusiones:
- Las oscilaciones beta evocadas por la recompensa son un componente clave del aprendizaje de la recompensa y el comportamiento adaptativo.
- Las oscilaciones beta aberrantes pueden contribuir al desempeño de tareas inadecuadas y a trastornos del comportamiento.
- Las oscilaciones beta en la red cortico-strial representan un valor de recompensa aprendido, especialmente bajo condiciones inciertas.
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