Memory

Eichenbaum · Scholarpedia · 2008 · neuroscience · 10.4249/scholarpedia.1747 · record Eichenbaum2008-memory
tag layer · index · concepts · authors · עברית
Where this record's text came from. faceted 2026-08 by reading the locally held text (html); every evidence string verified as an exact substring of that text before merging. limitations is empty because this Scholarpedia entry never comments on the limits of its own account - it is a consensus overview with no methods, no data and no hedging about its own scope. Claim relations is empty because although the entry cites prior work heavily (Scoville & Milner 1957, Squire et al. 2004, McClelland et al. 1995 and others), it never positions itself for or against any of them; every citation is a bare source for a stated fact, which rule 7 excludes. method is review inferred from the entry's form - it synthesises other people's studies and reports no study of its own; the quoted sentence is the closest the text comes to describing itself ("a central tenet in this field"), since it never says "this review". Replication status = replicated rests on the entry's own wording that imaging studies "have confirmed" the medial-temporal findings first drawn from patient H.M. 2026-08-12 and 2026-08-26 schema-0.3 passes: every quote verified as an exact substring of the staged text and anchored at merge time; concept terms verified present; every edge endpoint an existing node.
This record’s own method is review, and the tags below follow from that. A review’s findings, quantities and statistics are things stated IN this paper, and some of them report results obtained elsewhere. No tag on this page names a different author. Measured across every review in this corpus, 81% of a review’s tags carry no citation at all — most of them are the review speaking. The corpus does not adjudicate the rest: read an unmarked tag as a claim this paper makes, not necessarily one it made first.
How to read this page. The article itself is not reproduced here — this paper is not cleared for redistribution, so what follows is the tag layer alone. The evidence sentences are withheld with the article. The table at the foot lists every tag the record carries; each row names the facet it belongs to, and the whose words column says whether the tag records the paper's own wording or the tagger's sentence about the paper. Every tag links to each other paper in the corpus carrying it. The machine-readable edition of the same thing is the TEI file beside this one, where the tags live in standOff, and the article is at its publisher via the link below. When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.
Other fields define these differently the same word, defined another way in another discipline
memory 23 fields · learning 7 fields · working memory 4 fields · semantic memory 4 fields · episodic memory 3 fields · priming 2 fields · and 2 more →

Tags on this paper

Every tag the record carries, each linking to every other paper in the corpus that carries it. A tag appears here whether or not its words occur in the article — the spans below are only the ones a sentence in this paper licenses. Of the 22 concept tags on this paper, 2 are grounded in a quoted sentence. All carry the tagger's gloss of what the term means in this paper, which is not something the article can license.
multiple memory systems declarative memory implicit memory episodic memory semantic memory working memory iconic memory procedural memory emotional memory relational memory processing memory consolidation medial temporal lobe hippocampus long-term potentiation long term depression Hebbian synapse false memory habituation sensitization familiarity recollection associative memory Coincident excitatory input and depolarization at NMDA receptors admits Ca++, triggering a cAMP-CREB-immediate-early-gene-protein-synthesis cascade that structurally fixes the synaptic change Repeated two-way medial-temporal-cortical interactions (including replay) progressively reorganize connections among cortical representations, consolidating episodes and semantic knowledge into permanent storage Emotional arousal releases glucocorticoids and engages adrenergic mechanisms through the amygdala, which modulates the strength of memory fixation in other memory systems memory learning priming long-term potentiation (LTP) long term depression (LTD) flashbulb memories review

Legend

second readingalternativesan independent re-reading of a facet, recorded whether or not it agrees
relation to other workclaim_relationshow this paper stands to another: agrees, contradicts, extends, qualifies
claim typeclaim_typethe shape of the claim: existence, mechanism, method, critique, prediction, null
concept edgeconcept_edgesan asserted relation between two concepts, with the sentence asserting it
conceptconceptsan idea the paper works with, quoted where the paper uses it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
limitationlimitationswhat the paper says its evidence cannot support
mechanismmechanismshow the reported effect is said to come about
methodmethodhow the paper produced its evidence
object of studyobject_of_studywhat the paper is about — the thing it investigates
phenomenonphenomenonthe effect or regularity under study
sensesensesa distinct use of a term, quoted where the paper fixes it

The paper

The full text is not reproduced here. This article is not cleared for redistribution, so the page carries the tag layer only. Its evidence sentences are withheld; the grounding status remains with each tag, and the article itself is at https://doi.org/10.4249/scholarpedia.1747. The reading view exists for the papers whose licence permits it.

Every tag on this page

alternatives 2 · claim_relations 3 · claim_type 1 · concept_edges 11 · concepts 2 · content_tags 32 · limitations 3 · mechanisms 9 · method 1 · object_of_study 1 · phenomenon 1 · senses 6

Relations on this page carry a quotation for the claim. Where a relation was separately evidenced — and so tested against the vocabulary for its type — the row says so; none of 11 relations here carry that mark. The rest are the tagger’s reading of the sentence quoted beside them.

This record holds no controls. A layer is empty when the tagger recorded nothing in it — which is not the same as the paper having nothing to record.

facettagfieldconf.whose words
object_of_studyThe forms memory takes, the brain systems that support each, and the synaptic mechanisms common to all of them.
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object_of_studythe paper's words
claim_typeexistence
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claim_typethe paper's words
phenomenonmemory
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phenomenonthe paper's words
methodreview
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also in: review
methodthe paper's words
mechanismsmechanisms
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[0]the tagger's words
mechanismsmechanisms
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[1]the tagger's words
mechanismsmechanisms
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mechanisms[2]the tagger's words
mechanismsThe medial temporal lobe converts short-term into long-term memory without being the permanent store, which is why H.M. lost new memories and kept old ones
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mechanisms[3]the tagger's words
mechanismsDeclarative memory works by binding items to each other, to their context and to neighbouring events, which is what makes it relational
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mechanisms[4]the tagger's words
mechanismsFalse memory is a failure of that same relational machinery rather than a separate defect - the network returns relations that never occurred
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mechanisms[5]the tagger's words
mechanismsLong-term potentiation runs through a molecular cascade ending in protein synthesis, and blocking any step blocks permanent memory
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mechanisms[6]the tagger's words
mechanismsThe timing of that blockade separates the two kinds of memory: it stops permanent fixation and leaves initial learning and short-term memory intact
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mechanisms[7]the tagger's words
mechanismsPotentiation and depression share a molecular substrate and differ only in the timing rules of synaptic activity
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mechanisms[8]the tagger's words
limitationsThe foundational evidence for the whole framework rests on a single surgical patient
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what this limits: the empirical base of the whole systems framework: it begins with THE STUDY OF A PATIENT KNOWN BY HIS INITIALS H.M. - a single surgical case
limitations[0]the tagger's words
limitationsThe systems are described as distinct while also interacting and storing the same event separately, so the boundaries are functional rather than sharp
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what this limits: any claim that the memory systems are separable: THE PROCEDURAL AND EMOTIONAL MEMORY SYSTEMS CAN STORE AND DISTINCTLY EXPRESS DIFFERENT FORMS OF MEMORY EVEN FOR THE SAME EVENT - distinct and simultaneously overlapping
limitations[1]the tagger's words
limitationsImplicit memory is characterised as a variety of systems rather than one, so the category is defined by what it is not
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what this limits: the category implicit memory itself: THESE VARIOUS FORMS OF IMPLICIT MEMORY ARE SUPPORTED BY A VARIETY OF MEMORY SYSTEMS - it is not one system but the residue left when declarative memory is removed
limitations[2]the tagger's words
conceptslong-term potentiation
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concepts[13]0.85the paper's words
conceptsassociative memory
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concepts[21]0.9the paper's words
sensesmemory - divided by DURATION: whether it lasts a short or a long period
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senses[0]1.0the tagger's words
sensesmemory - divided by EXPRESSION: explicit conscious remembering versus implicit change in speed or bias
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senses[1]1.0the tagger's words
sensesmemory - divided by CONTENT: unique experiences versus accumulated knowledge, the episodic/semantic axis
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senses[2]1.0the tagger's words
sensesshort-term memory - as working memory: explicitly a form of DECLARATIVE memory, held in consciousness
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senses[3]1.0the tagger's words
sensesimplicit memory - as a family of LONG-term systems: procedural, emotional and priming, each with its own pathway
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senses[4]1.0the tagger's words
sensesrecognition - familiarity versus recollection: two capacities of one cortical-hippocampal system
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senses[5]1.0the tagger's words
alternativesclaim_type: existence
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a second reading reaching the same value. Recorded: existence — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.claim_typethe tagger's words
alternativesphenomenon: memory
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a second reading reaching the same value. Recorded: memory — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.phenomenonthe tagger's words
claim_relationsextends → Scoville and Milner's report of patient H.M.
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claim_relations[0]the tagger's words
claim_relationssupports → Schacter's characterisation of implicit memory
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claim_relations[1]the tagger's words
claim_relationsextends → Eichenbaum and Cohen's multiple-memory-systems framework
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claim_relations[2]the tagger's words
concept_edgesworking memory —is-a→ declarative memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[0]the tagger's words
concept_edgesprocedural memory —is-a→ implicit memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[2]the tagger's words
concept_edgesdeclarative memory —distinct-from→ implicit memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[4]the tagger's words
concept_edgesmedial temporal lobe —causes→ memory consolidation
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes 'converting a short-term memory to a long-term, permanent memory store', not 'memory consolidation'.
concept_edges[5]the tagger's words
concept_edgeshippocampus —part-of→ medial temporal lobe
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strength of the relation: 1
concept_edges[6]the tagger's words
concept_edgesrelational memory processing —causes→ false memory
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but endpoint by anaphora: 'relational processing' = relational memory processing (previous sentence).
concept_edges[7]the tagger's words
concept_edgeslong-term potentiation —part-of→ Hebbian synapse
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but LTP is INDUCED AT the Hebbian synapse; part-of is loose.
concept_edges[8]the tagger's words
concept_edgeslong term depression —contrasted-with→ long-term potentiation
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[9]the tagger's words
concept_edgeshabituation —part-of→ multiple memory systems
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but habituation is named among the elementary FORMS of memory; part-of 'multiple memory systems' is loose.
concept_edges[11]the tagger's words
concept_edgesfamiliarity —distinct-from→ recollection
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[12]the tagger's words
concept_edgesepisodic memory —is-a→ associative memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 0.9 · note: REPLACES concept_edges[1], which typed episodic memory as a kind of DECLARATIVE memory. That is true of the field and this paper does not say it: the only sentence in the staged body placing episodic memory under a superclass places it under ASSOCIATIVE memory. The old edge is withdrawn, not corrected in place, because its 'to' was wrong rather than its quote. NO 'relation'/relation evidence ON THIS EDGE, DELIBERATELY: the sentence's class cue is 'the most complex forms of associative memory', and the gate's is-a cue list holds 'a form of' but not 'forms of'. That is an earlier note of ours exactly - the cue vocabulary lacks the plural of a form it already accepts - and I am not editing the cue lists, which have two named amenders. The edge therefore joins the 92% that carry a span and no marked clause. Add the clause when the vocabulary is widened.
concept_edges[14]0.9the tagger's words
content_tagsAcross all its varieties, memory is claimed to reduce to changes in synaptic connections inside the circuits of each memory system.
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content_tags.findings[0]the tagger's words
content_tagsBlocking the molecular cascade only works within minutes of learning, which shows the cascade is needed for permanent fixation but not for initial or short-term memory.
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content_tags.findings[1]the tagger's words
content_tagsEpisodic memory is the form most prominently impaired by aging, even though all types of learning capacity decline somewhat.
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content_tags.findings[2]the tagger's words
content_tagsAge-related memory loss is attributed to fewer synaptic connections and weakened neuromodulation rather than to neuronal death.
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content_tags.findings[3]the tagger's words
content_tagsFalse memory is characterised as a failure of relational processing that retrieves relations which never occurred but are supported by the relational network.
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content_tags.findings[4]the tagger's words
content_tagsH.M. could not remember new information, yet kept considerable memories from childhood up to a few years before his surgery.
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[5]the tagger's words
content_tagsblocking the molecular cascade prevents permanent memory while leaving initial learning and short-term memory intact
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content_tags.findings[6]the tagger's words
content_tagsamnesic patients impaired in declarative memory typically retain implicit memory
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content_tags.findings[7]the tagger's words
content_tagspotentiation and depression occur in every structure known to take part in memory
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content_tags.findings[8]the tagger's words
content_tagsmemory
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also in: memory
content_tags.definitions[0]the tagger's words
content_tagsmultiple memory systems
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content_tags.definitions[1]the tagger's words
content_tagslearning
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also in: learning
content_tags.definitions[2]the tagger's words
content_tagsdeclarative memory
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content_tags.definitions[3]the tagger's words
content_tagsworking memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[4]the tagger's words
content_tagsepisodic memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[5]the tagger's words
content_tagssemantic memory
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[6]the tagger's words
content_tagsimplicit memory
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content_tags.definitions[7]the tagger's words
content_tagspriming
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also in: priming
content_tags.definitions[8]the tagger's words
content_tagsprocedural memory
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content_tags.definitions[9]the tagger's words
content_tagsmemory consolidation
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content_tags.definitions[10]the tagger's words
content_tagsrelational memory processing
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content_tags.definitions[11]the tagger's words
content_tagslong-term potentiation (LTP)
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[12]the tagger's words
content_tagslong term depression (LTD)
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content_tags.definitions[13]the tagger's words
content_tagsflashbulb memories
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content_tags.definitions[14]the tagger's words
content_tagsdeclarative memory
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content_tags.definitions[15]the tagger's words
content_tagsimplicit memory
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content_tags.definitions[16]the tagger's words
content_tagsepisodic memory
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content_tags.definitions[17]the tagger's words
content_tagsworking memory
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content_tags.definitions[18]the tagger's words
content_tagsprocedural memory
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content_tags.definitions[19]the tagger's words
content_tagslong-term potentiation
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content_tags.definitions[20]the tagger's words
content_tagsmemory consolidation
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content_tags.definitions[21]the tagger's words
content_tagslearning
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also in: learning
content_tags.definitions[22]the tagger's words

Interpretive choices

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What was deliberately not tagged, and why, is recorded per paper by the tagger. Where a paper has no such record, this page says so rather than implying that nothing was declined.

© 2026 Shir Sivroni · ORCID 0009-0000-2597-2824