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Las funciones disociables del estriado ventral y dorsal en el acondicionamiento instrumental
John O'Doherty1, Peter Dayan, Johannes Schultz
1Wellcome Department of Imaging Neuroscience, Institute of Neurology, University College London, London WC1N 3BG, UK. j.odoherty@fil.ion.ucl.ac.uk
Science (New York, N.Y.)
|April 17, 2004
Resumen
Este estudio revela distintas regiones cerebrales para la predicción de recompensas y la selección de acciones en el acondicionamiento instrumental. El estriado ventral actúa como un crítico para la predicción de la recompensa, mientras que el estriado dorsal funciona como un actor para la selección de la acción.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Ciencias Cognitivas Ciencias Cognitivas.
- Aprendizaje por Refuerzo Aprendizaje por Refuerzo
Sus antecedentes:
- El condicionamiento instrumental implica el aprendizaje de asociaciones acción-resultado.
- Los modelos de aprendizaje por refuerzo proponen roles distintos de crítico y actor.
- El crítico predice recompensas futuras, mientras que el actor selecciona acciones.
Objetivo del estudio:
- Para investigar las bases neuronales del acondicionamiento instrumental en humanos.
- Para diferenciar las regiones del cerebro asociadas con las funciones de crítico y actor.
Principales métodos:
- Se utilizaron imágenes de resonancia magnética funcional (IRMf).
- Los participantes humanos se sometieron a tareas de acondicionamiento instrumental.
- La actividad cerebral fue analizada durante la tarea.
Principales resultados:
- Se observaron contribuciones parcialmente distintas del estriado ventral y dorsal.
- El estriado ventral se correlacionó con la función crítica (predicción de la recompensa).
- El estriado dorsal se correlacionó con la función del actor (selección de acción).
Conclusiones:
- El estriado ventral y dorsal juegan papeles disociables en el acondicionamiento instrumental.
- Los hallazgos apoyan el modelo crítico-actor del aprendizaje por refuerzo en el cerebro humano.
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