Video Experimental Relacionado
Updated: Jan 30, 2026
06:04
Author Spotlight: Establishment and Confirmation of a Postnatal Right Ventricular Volume Overload Mouse Model
Published on: June 9, 2023
1.5K
Aparición de secuencias preconfiguradas y plásticas comprimidas en el tiempo en el desarrollo posnatal temprano
1Interdepartmental Neuroscience Program, Yale School of Medicine, New Haven, CT, USA.
Science (New York, N.Y.)
|January 12, 2019
Resumen
El cerebro en desarrollo organiza gradualmente las redes neuronales del hipocampo para la memoria. Las secuencias independientes de la experiencia se forman en la semana 3, con un procesamiento de memoria similar al adulto que emerge en la semana 4.
Área de la Ciencia:
- La neurociencia
- Neurociencia del desarrollo
- La neurociencia cognitiva
Sus antecedentes:
- La organización de los conjuntos neuronales del hipocampo es crucial para la memoria episódica.
- La línea de tiempo de desarrollo y los mecanismos subyacentes a esta organización siguen siendo en gran medida desconocidos.
Objetivo del estudio:
- Investigar el surgimiento de la organización del conjunto neuronal del hipocampo que apoya la codificación y consolidación de la memoria.
- Determinar el papel de la edad, la experiencia de navegación y el sueño en este proceso de desarrollo.
Principales métodos:
- Registros electrofisiológicos de grandes conjuntos neuronales del hipocampo en ratas ingenuas.
- Las grabaciones se llevaron a cabo desde la apertura de los ojos hasta la semana 4 postnatal durante la navegación y el sueño en entornos lineales.
Principales resultados:
- Secuencias preconfiguradas, similares a la trayectoria, ensambladas independientemente de la experiencia de navegación en la semana postnatal 3.
- La formación de trayectoria comprimida similar a la de los adultos durante la navegación y la repetición dependiente de la experiencia durante el sueño surgieron simultáneamente a principios de la semana posparto 4.
- Estos patrones secuenciales se desarrollaron a partir de secuencias espontáneas y preconfiguradas.
Conclusiones:
- Existen distintas fases de desarrollo para la formación de patrones secuenciales en el hipocampo.
- El desarrollo temprano implica una preconfiguración independiente de la experiencia, seguida de un refinamiento dependiente de la experiencia crucial para la memoria episódica.
Videos de Conceptos Relacionados
01:27Emerging Adulthood
681
Jeffrey Arnett's concept of emerging adulthood offers a framework to understand the unique developmental stage between adolescence and full-fledged adulthood, generally from ages 18 to 25. This period is marked by extensive exploration and shifts in identity, relationships, and career choices, a process known in psychology as role experimentation. Emerging adulthood reflects the evolving cultural expectations surrounding adulthood and the dynamic process of personal transformation during...
681
00:58Plasticity
3.1K
Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
3.1K
01:31Plasticizers
367
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
367
01:21Plastic Behavior
573
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
573
01:14Plastic Deformations
438
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
438
01:19Plastic Deformations
461
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
461