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System of Memory01:23

System of Memory

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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Long-Term Memory01:18

Long-Term Memory

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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Traumatic Memory01:20

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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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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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The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
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Pridopidine Reverses Phencyclidine-Induced Memory Impairment.

Kristoffer Sahlholm1,2, Marta Valle-León1,3, Víctor Fernández-Dueñas1,3

  • 1Unitat de Farmacologia, Departament Patologia i Terapèutica Experimental, Facultat de Medicina i Ciències de la Salut, IDIBELL-Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain.

Frontiers in Pharmacology
|April 26, 2018
PubMed
Summary

Pridopidine, a potential treatment for Huntington's disease, reversed memory loss in mice. This pro-cognitive effect was linked to its action on sigma-1 receptors, suggesting neuroprotective benefits.

Keywords:
cognitiondopamine stabilizersmicephencyclidinesigma-1 receptor

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Pridopidine is under investigation for Huntington's disease (HD).
  • It targets dopamine D2 receptors but has higher affinity for sigma-1 receptors.
  • Pridopidine shows promise in preclinical and preliminary clinical HD studies.

Purpose of the Study:

  • To investigate the anti-amnesic potential of pridopidine.
  • To explore the role of sigma-1 receptors in pridopidine's cognitive effects.

Main Methods:

  • Memory impairment was induced in mice using phencyclidine (PCP).
  • Mice were treated with pridopidine or saline.
  • Novel object recognition tests assessed memory performance.
  • The effect of a sigma receptor antagonist (NE-100) was evaluated.

Main Results:

  • PCP-induced memory deficits were observed in mice.
  • Pridopidine treatment successfully counteracted PCP-induced amnesia.
  • The anti-amnesic effect of pridopidine was reduced when co-administered with NE-100.

Conclusions:

  • Pridopidine demonstrates significant anti-amnesic properties.
  • These effects are mediated, at least in part, by sigma-1 receptor interactions.
  • Pridopidine shows potential as a pro-cognitive and neuroprotective agent.