Video Experimental Relacionado
Updated: Jul 2, 2026
04:27
Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans
Published on: March 15, 2019
La experiencia sensorial modifica la dinámica a corto plazo de las sinapsis neocorticales
G T Finnerty1, L S Roberts, B W Connors
1Department of Neuroscience, Brown University, Providence, Rhode Island 02912, USA.
Nature
|August 4, 1999
Resumen
La privación sensorial altera la dinámica sináptica a corto plazo en la corteza de los bigotes de la rata. Estos cambios en las vías excitatorias, particularmente las horizontales, ayudan a explicar cómo los mapas corticales se reorganizan con la experiencia sensorial alterada.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Neurofisiología La neurofisiología.
- Los sistemas sensoriales son sistemas sensoriales.
Sus antecedentes:
- Los mapas corticales en el neocórtex representan estímulos sensoriales topográficamente.
- Estos mapas exhiben plasticidad dependiente de la experiencia, encogiéndose o expandiéndose en función de la información sensorial.
- Los mecanismos celulares subyacentes a la reorganización del mapa cortical después de la privación sensorial siguen sin estar claros.
Objetivo del estudio:
- Para investigar los mecanismos celulares de la plasticidad dependiente de la experiencia en mapas corticales.
- Explorar el papel de la dinámica sináptica a corto plazo en la reorganización cortical.
- Para entender cómo la privación sensorial afecta las vías sinápticas en la corteza supragranular.
Principales métodos:
- Desarrolló una preparación de corte cerebral in vitro de la corteza del barril del bigote de la rata.
- Examinó las vías excitatorias, tanto verticales como horizontales, dentro de la corteza supragranular.
- Evaluó el impacto de la privación sensorial en la dinámica sináptica a corto plazo.
Principales resultados:
- La privación sensorial altera significativamente la dinámica sináptica a corto plazo tanto en las vías excitatorias verticales como horizontales.
- Se encontró que las modificaciones en las vías horizontales amplifican los cambios en las entradas verticales.
- Estas alteraciones sinápticas ocurren dentro de las capas supragranulares de la corteza.
Conclusiones:
- Las dinámicas sinápticas a corto plazo están implicadas en la reorganización cortical funcional después de la privación sensorial.
- La plasticidad sináptica alterada en las vías horizontales juega un papel crucial en la amplificación de las respuestas a las entradas sensoriales restantes.
- Los hallazgos proporcionan una explicación celular para los cambios en el mapa cortical dependientes de la experiencia.
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.
01:16Sensory Functions of the Skin
The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
01:11Sensory Perception: Organization of the Somatosensory System
The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...
01:29Overview of Somatic Sensory Pathways
Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
01:01Neuroplasticity
Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
01:27Tactile and Chemical Senses
Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...