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Participación de la corteza visual en la discriminación táctil de la orientación
A Zangaladze1, C M Epstein, S T Grafton
1Department of Neurology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
Nature
|October 19, 1999
Resumen
La corteza visual es crucial para la percepción táctil. La alteración de la corteza occipital con la estimulación magnética transcraneal (EMT) deterioró la discriminación de la orientación táctil, lo que demuestra la visión visual.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Ciencias Cognitivas Ciencias Cognitivas.
- La percepción sensorial es la percepción sensorial.
Sus antecedentes:
- Los sentidos primarios como la visión y el tacto suelen considerarse separados.
- Sin embargo, las imágenes visuales influyen en la percepción táctil de las propiedades del objeto (por ejemplo, forma, tamaño, orientación).
- Las tareas táctiles, incluida la discriminación de orientación de la rejilla, activan áreas de la corteza visual.
Objetivo del estudio:
- Investigar la necesidad de la corteza visual para la discriminación de la orientación táctil.
- Para determinar si el trastorno de la función de la corteza occipital afecta la percepción táctil.
Principales métodos:
- Estimulación magnética transcraneal focal (TMS) aplicada a la corteza occipital.
- TMS alteración de la función de la corteza visual.
- Comparación con el TMS sobre la corteza somatosensorial.
- Evaluación de la discriminación táctil de la orientación y textura de la rejilla.
- Registro de potenciales evocados durante las tareas táctiles.
Principales resultados:
- La alteración de la función de la corteza occipital con TMS interfirió con la discriminación de la orientación táctil.
- Este efecto fue específico de la orientación, no de la discriminación de texturas o de la detección de estímulos eléctricos.
- TMS sobre la corteza somatosensorial afectó tanto a la discriminación de la textura y la orientación.
- Potenciales evocados observados en el cuero cabelludo posterior durante la discriminación de orientación táctil.
Conclusiones:
- La corteza visual juega un papel necesario en la discriminación de la orientación táctil.
- Este estudio proporciona la primera evidencia de que el procesamiento cortical visual es esencial para la percepción táctil normal.
- Los hallazgos desafían la visión tradicional de las distintas modalidades sensoriales.
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