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Representación topográfica de la numerosidad en la corteza parietal humana
B M Harvey1, B P Klein, N Petridou
1Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, 3584 CS, Netherlands. b.m.harvey@uu.nl
Science (New York, N.Y.)
|September 7, 2013
Resumen
Los investigadores descubrieron un mapa topográfico de numerosidad en la corteza parietal humana. Este mapa representa la cantidad de elementos, lo que demuestra que la información numérica abstracta está organizada de manera similar a los datos sensoriales.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Neurociencia cognitiva y neurociencia cognitiva.
- La neuroimagen es una técnica de neuroimagen.
Sus antecedentes:
- El procesamiento de la multiplicidad ocurre en la corteza de asociación, exhibiendo propiedades similares a los sentidos primarios.
- Las cortizas sensoriales primarias presentan mapas topográficos que reflejan las estructuras de los órganos sensoriales.
- La organización de la representación numérica en el cerebro sigue siendo una pregunta abierta.
Objetivo del estudio:
- Investigar si la representación cortical y el procesamiento de la numerosidad están organizados topográficamente.
- Para determinar si las características numéricas abstractas están mapeadas topográficamente en la corteza de asociación.
Principales métodos:
- Utilizó imágenes de resonancia magnética funcional de alto campo (7 Tesla) para estudiar poblaciones neuronales en la corteza parietal humana.
- Examinó la sintonización neuronal a pequeñas cantidades y su organización espacial.
Principales resultados:
- Se identificaron poblaciones neuronales organizadas topográficamente sintonizadas con pequeñas numerosidades en la corteza parietal, formando un "mapa de la numerosidad".
- Este mapa demostró la robustez frente a los cambios en las características de estímulo de bajo nivel.
- Se observó que el área de la superficie cortical disminuyó con el aumento de la numerosidad, mientras que el ancho de afinación aumentó con la numerosidad preferida.
Conclusiones:
- La corteza parietal humana exhibe un mapa topográfico para la representación de las numerosidades.
- Estos hallazgos extienden los principios topográficos a la organización de rasgos abstractos de orden superior dentro de la corteza de asociación.
- Sugiere un principio organizativo fundamental para representar tanto la información sensorial como la abstracta en el cerebro.
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