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Principios subyacentes a la topografía de mapas sensoriales en la corteza visual primaria
Jens Kremkow1, Jianzhong Jin1, Yushi Wang1
1Graduate Center for Vision Research, State University of New York, College of Optometry, 33 West 42nd Street, New York, New York 10036, USA.
Nature
|April 28, 2016
Resumen
Los mapas de la corteza visual para la orientación y la disparidad están vinculados a los mapas de ubicación espacial. Esta organización se deriva de cómo se organizan las señales de luz (ON) y oscuridad (OFF) del tálamo, revelando un principio común en la topografía visual.
Área de la Ciencia:
- La neurociencia
- Sistema de visión
- Mapeo cortical
Sus antecedentes:
- La corteza visual primaria contiene mapas detallados de escenas visuales basadas en la ubicación, el dominio ocular y la orientación.
- Los orígenes de los mapas para la orientación, la dirección y la disparidad de la retina no se comprenden completamente.
- Los mapas existentes para la ubicación espacial y el dominio ocular están vinculados a la disposición de los axones aferentes del tálamo.
Objetivo del estudio:
- Investigar los principios organizativos que subyacen a los mapas corticales visuales.
- Determinar la relación entre los mapas de ubicación espacial y otros mapas dimensionales de estímulos visuales.
- Para aclarar el papel de la organización aferente del tálamo en la topografía cortical visual.
Principales métodos:
- Análisis de mapas corticales en la corteza visual del gato (Felis catus).
- Examen de la disposición espacial de los axones aferentes del tálamo.
- Correlación de mapas de estímulo ON-OFF con mapas de orientación, dirección y disparidad retiniana.
Principales resultados:
- Los mapas corticales para la orientación, la dirección y la disparidad de la retina están fuertemente relacionados con el mapa de ubicación espacial de los estímulos claros (ON) y oscuros (OFF).
- El mapa ON-OFF se caracteriza como dominado por OFF, centrado en OFF y ortogonal a las columnas de dominación ocular.
- Esta organización ON-OFF se origina en el agrupamiento de los aferentes tálamicos ON y OFF.
Conclusiones:
- Un principio de organización común subyace a la topografía cortical visual.
- Los axones talamicos con retinotopía similar y polaridad ON-OFF están dispuestos en regiones corticales vecinas.
- Esta disposición dicta la formación de mapas para la orientación, la dirección y la disparidad de la retina.
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