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Los focos de plasticidad de orientación en la corteza visual
1Department of Brain and Cognitive Sciences and Center for Learning and Memory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. vdragoi@ai.mit.edu
Nature
|May 3, 2001
Resumen
Las neuronas en la corteza visual del gato (V1) exhiben plasticidad localizada a corto plazo en la sintonización de la orientación. Los centros de pinwheel muestran una adaptación significativa, a diferencia de las áreas circundantes, lo que sugiere una plasticidad cortical no uniforme.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Plasticidad de la corteza visual Plasticidad de la corteza visual
- Los microcircuitos corticales son
Sus antecedentes:
- Las áreas corticales se consideran típicamente uniformes en su plasticidad.
- Las neuronas en la corteza visual están organizadas en dominios sintonizados por la orientación y centros de pinwheel.
Objetivo del estudio:
- Para investigar la uniformidad espacial de la plasticidad inducida por la adaptación en la corteza estriada del gato (V1).
- Para determinar si las neuronas en diferentes dominios corticales (iso-orientación frente a los centros de pinwheel) exhiben plasticidad diferencial.
Principales métodos:
- Registros electrofisiológicos de las neuronas V1 del gato.
- Adaptación utilizando estímulos orientados de rejilla de deriva.
- Análisis de las propiedades de ajuste de orientación antes y después de la adaptación.
Principales resultados:
- Las neuronas en y cerca de los centros de la rueda de piñón V1 mostraron una plasticidad significativa inducida por la adaptación en el ajuste de la orientación.
- La adaptación causó cambios repulsivos en la preferencia de orientación y magnitudes de respuesta alteradas en las neuronas del centro del pinwheel.
- Las neuronas en los dominios de iso-orientación exhibieron cambios mínimos en la sintonización después de la adaptación.
Conclusiones:
- La plasticidad cortical, específicamente la adaptación de ajuste de orientación, no es uniforme en V1.
- Los centros de pinwheel representan focos de plasticidad a corto plazo pronunciada, que difieren de los dominios de iso-orientación.
- Las interacciones intracorticales locales probablemente median la anisotropía observada en la plasticidad inducida por la adaptación.
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