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Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Repressed Memory01:16

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Repressed memories are a psychological phenomenon where memories of traumatic events are unconsciously blocked from a person's awareness. This process occurs as a defense mechanism, protecting the mind from the emotional impact of distressing or painful experiences. For example, a person who has experienced childhood trauma may grow up with no conscious recollection of the event. In such cases, the memories are thought to be buried deep within the subconscious, inaccessible to the conscious...
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Long-term Depression01:03

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Long-term Depression01:05

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Higher Mental Functions of Brain: Learning and Memory01:26

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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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Role of Amygdala in Memory01:16

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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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A Prediction Error-driven Retrieval Procedure for Destabilizing and Rewriting Maladaptive Reward Memories in Hazardous Drinkers
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Múltiples mecanismos represivos en el hipocampo durante la formación de la memoria

Jun Cho1, Nam-Kyung Yu2, Jun-Hyeok Choi2

  • 1Center for RNA Research, Institute for Basic Science, Seoul 151-742, Korea. Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea.

Science (New York, N.Y.)
|October 3, 2015
PubMed
Resumen

La represión genética es crucial para la formación de la memoria. Este estudio revela nuevos mecanismos de silenciamiento genético en el hipocampo, incluida la señalización del receptor de estrógeno 1 (ESR1 / ERα), que afecta la estabilización de la memoria después del aprendizaje.

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Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Investigating Long-term Synaptic Plasticity in Interlamellar Hippocampus CA1 by Electrophysiological Field Recording
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Área de la Ciencia:

  • La neurociencia
  • Biología molecular
  • La genómica

Sus antecedentes:

  • La estabilización de la memoria implica procesos moleculares complejos, incluida la regulación genética.
  • La dinámica temporal de estos cambios a escala genómica después del aprendizaje sigue siendo en gran medida inexplorada.

Objetivo del estudio:

  • Investigar los cambios moleculares temporales a escala genómica, específicamente las regulaciones traslacionales y transcripcionales, en el hipocampo del ratón después del condicionamiento del miedo contextual.
  • Identificar nuevos mecanismos de represión genética críticos para la formación de la memoria.

Principales métodos:

  • Se emplearon perfiles de ribosoma y secuenciación de ARN para cuantificar el estado traslacional y los niveles de transcripción.
  • Se realizaron análisis de comportamiento para evaluar el impacto de las manipulaciones genéticas específicas en la memoria.

Principales resultados:

  • Se identificaron tres tipos distintos de represión génica: supresión traslacional de genes de proteínas ribosómicas, represión traslacional inducida por el aprendizaje temprano de genes específicos y supresión persistente tardía a través de la señalización del receptor de estrógeno 1 (ESR1 / ERα).
  • La sobreexpresión de Nrsn1 o la activación de ESR1 / ERα señalan una formación de memoria deteriorada.

Conclusiones:

  • La represión genética juega un papel significativo y previamente subestimado en la formación y estabilización de la memoria.
  • El estudio destaca la importancia del control traslacional y la señalización ESR1/ERα en los procesos de memoria del hipocampo.