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Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or...
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Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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La memoria, el recuerdo. Las células de engramas retienen la memoria bajo amnesia retrógrada.

Tomás J Ryan1, Dheeraj S Roy2, Michele Pignatelli2

  • 1RIKEN-MIT Center for Neural Circuit Genetics at the Picower Institute for Learning and Memory, Department of Biology and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|May 30, 2015
PubMed
Resumen
Este resumen es generado por máquina.

La consolidación de la memoria estabiliza los recuerdos mediante el fortalecimiento de las conexiones dentro de células cerebrales específicas, conocidas como engramas de memoria. Incluso cuando la síntesis de proteínas está bloqueada, la reactivación de estas células de engramas puede recuperar recuerdos, destacando su papel crucial.

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Investigación de la memoria Investigación de la memoria.
  • Biología celular Biología celular.

Sus antecedentes:

  • La consolidación de la memoria transforma los recuerdos inestables en estables a largo plazo.
  • Los mecanismos precisos de la consolidación de la memoria, particularmente el papel de los engramas de memoria, siguen siendo incompletamente entendidos.

Objetivo del estudio:

  • Investigar si la consolidación de la memoria se basa únicamente en la estabilización de los engramas de memoria.
  • Explorar los cambios celulares y sinápticos asociados con la consolidación y recuperación de la memoria.

Principales métodos:

  • Utilizó el etiquetado celular dependiente del aprendizaje para identificar células de engramas de memoria.
  • Evaluación de la fuerza sináptica y la densidad de la columna dendrítica en células de engramas.
  • Empleó la activación optogenética para sondear los mecanismos de recuperación de memoria.

Principales resultados:

  • Las células de engramas de memoria consolidada exhibieron un aumento de la fuerza sináptica y la densidad de la columna dendrítica.
  • Las células de Engram afectadas por los inhibidores de la síntesis de proteínas carecían de estas propiedades.
  • La activación optogenética directa de las células engramas condujo a la recuperación de la memoria, correlacionándose con la conectividad preservada.

Conclusiones:

  • Los patrones específicos de conectividad dentro de las células de engramas son vitales para almacenar información de la memoria.
  • Las sinapsis fortalecidas en las células del engrama juegan un papel crítico en el proceso de recuperación de la memoria.