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Related Concept Videos

Amnesia01:13

Amnesia

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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.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
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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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Dissociative amnesia is a complex psychological condition that manifests as an inability to recall personal information, often tied to traumatic or stressful events. Unlike general amnesia, individuals with this condition retain the ability to perform routine activities and procedural tasks, such as operating a phone or navigating public transportation, yet experience profound gaps in autobiographical memory. These lapses may encompass significant life events, such as suicide attempts or...
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False memories represent a cognitive distortion in which individuals recall events that did not happen, or remember them in an altered form. This phenomenon highlights the brain's constructive nature in processing and recalling memories, emphasizing that memory is not a perfect representation of past events but rather a dynamic reconstruction influenced by various factors.
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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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Explicit memories, also known as declarative memories, are consciously remembered, recalled, and reported. Studying for a chemistry exam involves material that will become part of explicit memory. There are two types of explicit memory: episodic and semantic.
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The amnesias.

R Shayna Rosenbaum1,2, Kelly J Murphy3,4, Jill B Rich1,3

  • 1Department of Psychology, York University, Toronto, ON, Canada.

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Summary

This study explores memory and amnesia, distinguishing between different memory types like implicit and explicit memory. Rethinking memory representation is crucial if amnesia affects more than just conscious recall.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Clinical Neuropsychology

Background:

  • Memory and amnesia have long been central to philosophical and empirical studies.
  • Distinguishing between memory types (e.g., implicit/explicit, episodic/semantic) is key, informed by amnesic individuals like H.M. and K.C.

Purpose of the Study:

  • To provide an overview of memory and amnesia from multiple scientific perspectives.
  • To examine memory organization in healthy brains and memory dissociations in amnesia.
  • To explore theories of medial temporal lobe (MTL) amnesia and the hippocampus's role.

Main Methods:

  • Review of historical perspectives on memory.
  • Analysis of extensively studied amnesia cases (H.M., K.C.).
  • Selective review of amnesia and neuroimaging literature, focusing on MTL amnesia.

Main Results:

  • Memory impairment is linked to damage in specific brain regions: medial temporal lobe (MTL), diencephalon, basal forebrain, and frontal lobes.
  • MTL amnesia has received significant research attention.
  • The hippocampus's role in episodic memory, spatial memory, future imagining, perception, implicit memory, and working memory is discussed.

Conclusions:

  • Amnesia may not be restricted solely to explicit (consciously accessible) memory.
  • Findings challenge current models of how memory is represented in the human brain.
  • Further research is needed to fully understand the complexities of memory and amnesia.