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Related Concept Videos

Amnesia01:13

Amnesia

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...
Higher Mental Functions of Brain: Learning and Memory01:26

Higher Mental Functions of Brain: Learning and Memory

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 playing an...
Implicit Memories01:24

Implicit Memories

Implicit memories, also known as non-declarative memories, are long-term memories that function outside of conscious awareness. These memories influence behavior and skills without explicit knowledge. This type of memory is evident in tasks like playing tennis, snowboarding, and texting. Implicit memory has three subsystems: procedural memory, conditioning, and priming. This type of memory is essential in various activities, from everyday tasks to specialized skills.
One key aspect of implicit...
Dissociative Amnesia01:21

Dissociative Amnesia

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...
Forgetting01:21

Forgetting

Forgetting is an intrinsic aspect of human memory, characterized by the gradual loss or inaccessibility of information over time. Hermann Ebbinghaus, a pioneering psychologist, extensively studied this phenomenon and formulated the forgetting curve. This curve illustrates that memory loss occurs rapidly immediately after learning and then decelerates over time. Several mechanisms contribute to forgetting, including encoding failure, storage decay, retrieval failure, and interference.
Encoding...
Interference and Decay01:16

Interference and Decay

Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
Interference occurs when competing memories hinder the retrieval of particular information. It can be classified into two types: proactive and retroactive interference. Proactive...

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Related Experiment Video

Updated: Jul 3, 2026

Examining Recall Memory in Infancy and Early Childhood Using the Elicited Imitation Paradigm
06:35

Examining Recall Memory in Infancy and Early Childhood Using the Elicited Imitation Paradigm

Published on: April 28, 2016

[Knowing without remembering: the contribution of developmental amnesia].

C Lebrun-Givois1, B Guillery-Girard, C Thomas-Anterion

  • 1Service de Neurologie, hôpital de Bellevue, CHU de Saint Etienne, Boulevard Pasteur, 42055 saint Etienne cedex, France.

Revue Neurologique
|August 19, 2008
PubMed
Summary

The hippocampus may not be essential for acquiring new semantic knowledge, as demonstrated by individuals with developmental amnesia. Alternative neocortical networks might support semantic learning despite hippocampal damage.

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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

Published on: August 30, 2011

Related Experiment Videos

Last Updated: Jul 3, 2026

Examining Recall Memory in Infancy and Early Childhood Using the Elicited Imitation Paradigm
06:35

Examining Recall Memory in Infancy and Early Childhood Using the Elicited Imitation Paradigm

Published on: April 28, 2016

Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
11:01

Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

Published on: August 30, 2011

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurobiology

Context:

  • The role of the hippocampus in memory organization, particularly episodic and semantic memory, is a subject of ongoing debate.
  • Historical observations, such as those of patient HM, implicated the hippocampus in both memory systems.
  • Subsequent research has questioned the necessity of the hippocampus for new semantic knowledge acquisition.

Purpose:

  • To investigate the role of the hippocampus in semantic memory formation.
  • To present a new case study of developmental amnesia.
  • To synthesize existing data on hippocampal function in semantic learning.

Summary:

  • This paper details a new case of developmental amnesia with significant hippocampal atrophy and episodic memory impairment.
  • Despite severe hippocampal damage, the individual demonstrated the capacity for de novo semantic knowledge acquisition.
  • Findings align with previous studies, such as Vargha-Kadem's cases, showing preserved semantic learning in amnesic individuals.

Impact:

  • The findings challenge the indispensable role of the hippocampus in all forms of semantic learning.
  • Suggests the existence of a parallel, neocortical memory network for semantic information.
  • This alternative network may compensate for hippocampal impairment, enabling semantic acquisition through slower, more extensive exposure to stimuli.