Video Experimental Relacionado
Updated: Jul 8, 2026
09:45
Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
Published on: March 28, 2012
Selectividad de la forma en la corteza intraparietal lateral de los primates.
1Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA. sereno@cmbn.rutgers.edu
Nature
|October 17, 1998
Resumen
Las neuronas en la corteza parietal posterior, parte de la vía visual "dónde", demuestran selectividad de forma. Esto sugiere que la vía "donde" también procesa las características del objeto, independientemente del movimiento.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- La percepción visual es la percepción visual.
- Neurociencia cognitiva y neurociencia cognitiva.
Sus antecedentes:
- La corteza visual extrastriada se divide funcionalmente en regiones temporales ("qué") y parietales ("dónde").
- Los estudios neuropsicológicos apoyan esta segregación funcional.
- Se está investigando el papel de la corteza prefrontal en la integración de la información "qué" y "dónde".
Objetivo del estudio:
- Para investigar la selectividad de la forma en la corteza parietal posterior ("dónde" vía).
- Para determinar si la vía "dónde" contribuye al procesamiento de las características del objeto independientemente de las acciones motoras.
Principales métodos:
- Actividad neuronal registrada en la corteza parietal posterior de primates durante una tarea de fijación.
- Utilizó un paradigma retrasado de coincidencia con la muestra para evaluar las respuestas neuronales a los estímulos de forma.
- Se analizó la actividad de la unidad neuronal para la selectividad de la forma y las diferencias de período de retraso relacionadas con la forma de la muestra.
Principales resultados:
- Muchas neuronas en la corteza parietal posterior exhibieron selectividad de forma sensorial para formas geométricas 2D.
- Las unidades neuronales mostraron diferencias significativas en la actividad del período de retraso dependiendo de la forma de la muestra.
- La selectividad de la forma en la corteza parietal posterior fue comparable a la observada en la vía ventral ("qué").
Conclusiones:
- Las neuronas en la corteza parietal posterior (vía "dónde") contribuyen a atender y recordar las características de la forma.
- Este procesamiento de la forma ocurre independientemente de los movimientos oculares, el alcance o la manipulación de objetos.
- Los hallazgos desafían la estricta segregación funcional al demostrar el procesamiento de características dentro de la vía espacial "dónde".
Videos de Conceptos Relacionados
01:33Somatosensation
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
01:14Motor and Sensory Areas of the Cortex
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
01:21Association Areas of the Cortex
Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
01:22Lobes of the Cerebrum
The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.
01:23Somatosensory, Motor, and Association Cortex
The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...
01:28Lateralization
Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.