Medial thalamus in the territory of oculomotor basal ganglia represents stable object value.
Eur J Neurosci
; 49(5): 672-686, 2019 03.
Article
en En
| MEDLINE
| ID: mdl-30307646
ABSTRACT
Many visual objects are attached with values which were created by our long rewarding history. Such stable object values attract gaze. We previously found that the output pathway of basal ganglia from caudal-dorsal-lateral portion of substantia nigra pars reticulata (cdlSNr) to superior colliculus (SC) carries robust stable value signal to execute the automatic choice of valuable objects. An important question here is whether stable value signal in basal ganglia can influence on other inner processing such as perception, attention, emotion, or arousal than motor execution. The key brain circuit is another output path of basal ganglia the pathway from SNr to temporal and frontal lobes through thalamus. To examine the existence of stable value signal in this pathway, we explored thalamus in a wide range. We found that many neurons in the medial thalamus represented stable value. Histological examination showed that the recorded sites of those neurons included ventral anterior nucleus, pars magnocellularis (VAmc) which is the main target of nigrothalamic projection. Consistent with the SNr GABArgic projection, the latency of value signal in the medial thalamus was later than cdlSNr, and the sign of value coding in the medial thalamus was opposite to cdlSNr. As is the case with cdlSNr neurons, the medial thalamus neurons showed no sensitivity to frequently updated value (flexible value). These results suggest that the pathway from cdlSNr to the medial thalamus influences on various aspects of cognitive processing by propagating stable value signal to the wide cortical area.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Reconocimiento Visual de Modelos
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Aprendizaje por Asociación
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Ganglios Basales
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Vías Visuales
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Núcleos Talámicos Ventrales
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Reconocimiento en Psicología
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Memoria a Largo Plazo
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Red Nerviosa
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Neuronas
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Eur J Neurosci
Asunto de la revista:
NEUROLOGIA
Año:
2019
Tipo del documento:
Article
País de afiliación:
Estados Unidos