phenomenon · claim-type · cross-domain-transfer · mechanism · claim-relation · replication-status · limitation — grounded in the full text| phenomenon | hippocampal contribution to short-term associative memory— “We know from neuropsychological evidence, therefore, that the hippocampus is critical to short-term memory for associative information.” | |
| claim-type | mechanism— “These results suggest that the hippocampus plays an important role in the encoding and retrieval, but perhaps not the active maintenance, of novel associative information in short-term memory.” | |
| method — evidence | — “Editor's Note: These short, critical reviews of recent papers in the Journal, written exclusively by graduate students or postdoctoral fellows, are intended to summarize the important findings of the paper and provide additional insight and commentary.” | |
| object of study — evidence | — “Hannula and Ranganath (2008) use functional magnetic resonance imaging (fMRI) to address this important issue by characterizing brain activity during each phase of a short-term associative memory task and by linking such neural activity to behavioral performance.” | |
| research question — evidence | — “What is not clear from the neuropsychological data, however, is how the hippocampus supports this function.” | |
| transfer | from : Match enhancement, established in monkey inferotemporal and perirhinal single-unit work, imported to read a human hippocampal fMRI result— “As such, the findings observed by Hannula and Ranganath (2008) resemble the well known phenomenon of “match enhancement” observed in monkey inferotemporal/perirhinal cortex in relation to the… | transfers[0] |
| transfer | from : The subsequent-memory design, developed for long-term recognition memory, applied to a short-term task - which required deliberately making the task hard enough to avoid ceiling performance Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | transfers[1] |
| mechanism | the hippocampus holds short-term associative information by transiently changing synaptic efficacy rather than by sustained firing across the delay Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[0] |
| mechanism | the task being performed sets the amplitude of the hippocampal response to novel or familiar input, so top-down task demands determine whether match or mismatch produces the larger signal Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[1] |
| mechanism | The hippocampus may hold associations through transient changes in synaptic efficacy rather than sustained firing, which would explain why no delay-period signal appears Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[2] |
| mechanism | Active maintenance might still occur by a mechanism fMRI cannot see, such as theta/gamma oscillations Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[3] |
| mechanism | The hippocampus is proposed to act as a comparator, detecting discrepancies between predictions from past experience and current input Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[4] |
| mechanism | The commentary's own resolution of the conflicting match/mismatch results: the size of the hippocampal response to novelty depends on what task is being performed, with top-down influence present in explicit recognition and absent in automatic detection Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[5] |
| mechanism | Under explicit recognition the pattern resembles match enhancement in monkey inferotemporal and perirhinal cortex, whereas automatic novelty detection may show the comparator signal uncontaminated by top-down input Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[6] |
| builds-on | Hannula and Ranganath (2008) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[0] |
| contradicts | Kumaran and Maguire (2006) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[1] |
| builds-on | Norman and O'Reilly (2003) comparator model of the hippocampus Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[2] |
| contradicts | the dichotomous short-term/long-term memory account (Squire, 1992) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[3] |
| critiques | the textbook dichotomy of short-term and long-term memory as separate systems (Squire 1992) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[4] |
| supports | Norman and O'Reilly (2003), the hippocampus as comparator Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[5] |
| extends | Cohen and Eichenbaum (1993), the hippocampus as relational binder in long-term memory Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[6] |
| sense | memory - the textbook dichotomy: short-term and long-term as distinct processes with distinct substrates, which is the view under challenge Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[0] |
| sense | memory - the revised view: short-term and long-term as sharing neural mechanisms rather than being qualitatively distinct Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[1] |
| sense | subsequent memory - at the sample phase: encoding-side activity predicting later success, which alone cannot distinguish associative from item encoding Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[2] |
| sense | subsequent memory - at the test phase: retrieval-side activity, whose presence is what rules out the item-encoding explanation Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[3] |
| sense | hippocampal novelty signal - under explicit recognition: largest for MATCH, resembling match enhancement Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[4] |
| sense | hippocampal novelty signal - when novelty is incidental to the task: largest for MISMATCH, the opposite direction, which is the discrepancy the commentary sets out to explain Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[5] |
| sense | spatial strategy - allocentric: world-centred, hippocampally mediated, the one the task was designed to force Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | senses[6] |
| differs in | Kumaran and Maguire (2006) — THE AXIS IS WHETHER THE MEMORY JUDGMENT IS EXPLICIT OR INCIDENTAL. 'when the novelty/familiarity of associative information is incidental to the task at hand (i.e., subjects are not required to make explicit recognition memory judgments), a qualitatively different pattern of findings has been observed with hippocampal activation maximal under conditions of mismatch rather than match.' The direction of the hippocampal effect REVERSES on a task-instruction parameter - the strongest form this field takes, because the two literatures are not in conflict at all once the parameter is named. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | claim_relations[1] |
| differs in | perirhinal cortex —contrasted-with→ hippocampus — THE AXIS IS WHAT KIND OF INFORMATION IS BEING HELD. 'Whereas the perirhinal cortex appears to support short-term memory for novel object information, neuropsychological evidence suggests that the hippocampus is critical when associative information is involved.' Both structures support short-term memory; the division is BY CONTENT, NOT BY DURATION - which is the point, since duration is what the literature usually divides them by. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[1] |
| differs in | allocentric —distinct-from→ egocentric — THE AXIS IS THE REFERENCE FRAME, AND THE MANIPULATION THAT ENFORCES IT IS GIVEN. 'To encourage use of A HIPPOCAMPALLY MEDIATED ALLOCENTRIC (OR WORLD-CENTERED) strategy, rather than an egocentric (OR VIEWER-CENTERED) STRATEGY thought to rely on parietal and prefrontal cortices, subjects were asked to FORM A mental image of the scene rotated 90 [degrees].' The two frames are not observed and distinguished - one is INDUCED BY AN INSTRUCTION, so the result is conditional on subjects complying with it. A row of Kravitz2011 in this corpus gives the same axis as an anatomical tendency, hedged on both sides. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[5] |
| audit | hippocampus —distinct-from→ active maintenance — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the hippocampus supports encoding and retrieval 'but PERHAPS NOT' active maintenance; distinct-from is hedged. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[8] |
| weight | hippocampus —distinct-from→ active maintenance — 0.8 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[8] |
| edge | novelty —contrasted-with→ familiarity Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[9] |
| audit | match enhancement —part-of→ perirhinal cortex — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but match enhancement was OBSERVED IN monkey inferotemporal/perirhinal cortex; part-of is loose. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[10] |
| weight | match enhancement —part-of→ perirhinal cortex — 0.9 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[10] |
| audit | hippocampal amnesia —causes→ short-term memory — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but patients with hippocampal amnesia were IMPAIRED at remembering locations across a short delay; the edge lacks its direction (reduces). Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[12] |
| weight | hippocampal amnesia —causes→ short-term memory — 0.9 Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | concept_edges[12] |
| for which use | limitation — the commentary's central conclusion, which rests on an absence: ALTHOUGH CAUTION IS ADVISED IN INTERPRETING SUCH A NULL FINDING, THIS RESULT DOES SUGGEST THAT PERSISTENT NEURAL FIRING IN THE HIPPOCAMPUS DOES NOT OCCUR DURING THE DELAY PERIOD Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[0] |
| for which use | limitation — the match-versus-mismatch comparison it relies on: WITHOUT CONFIDENCE RATING DATA, IT IS DIFFICULT TO ENTIRELY EXCLUDE THE POSSIBILITY THAT SUBJECTS MAY HAVE BEEN MORE CONFIDENT IN MAKING (CORRECT) MATCH ... JUDGMENTS Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[1] |
| for which use | limitation — the same scope as limitations[1], and it is a re-raising rather than a new objection: THE AUTHORS CAREFULLY CONSIDERED AND DISCOUNTED SUCH AN EFFECT Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[2] |
| duplicate of | limitation — limitations[0] Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[3] |
| for which use | limitation — the same scope as limitations[0] - the maintenance conclusion is a null finding Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[3] |
| for which use | limitation — the comparator account: ONE IMPORTANT DIRECTION FOR FUTURE RESEARCH WILL BE TO DEVELOP AND EMPIRICALLY TEST FORMAL COMPUTATIONAL MODELS OF RECOGNITION MEMORY ... AND AUTOMATIC NOVELTY PROCESSING Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[4] |
| evidential status | mechanism — the paper's own words: One possibility is that Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | mechanisms[0] |
| replication | contested | |
| limitation | The commentary's central conclusion rests on a null delay-period result in the study it reviews, which it flags as requiring caution. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[0] |
| limitation | Absent confidence ratings, a performance/confidence confound in the match-versus-mismatch comparison it relies on cannot be entirely excluded. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[1] |
| limitation | The commentary's own caution: without confidence ratings, better performance on match trials cannot be fully separated from the neural difference attributed to match Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[2] |
| limitation | The central conclusion about maintenance rests on an absence of difference, which the commentary flags as a null result Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[3] |
| limitation | The formal models that would make the comparator account testable do not yet exist in the required form Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | limitations[4] |
finding · quantity · variable · definition · key-term — grounded in the full text| finding | Hippocampal activity measured during the sample (encoding) phase predicted whether the later recognition judgment would be correct. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[0] |
| finding | A subsequent-memory effect in the perirhinal cortex appeared only in the sample phase, consistent with that region encoding item-specific rather than associative information. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[1] |
| finding | Hippocampal delay-period activity did not differ with later recognition accuracy. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[2] |
| finding | On correct trials, hippocampal activation was higher for match displays than for either type of mismatch display. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[3] |
| finding | The direction of the hippocampal match/mismatch response reverses when novelty is incidental rather than the object of an explicit recognition judgment, with activation then peaking for mismatch. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[4] |
| finding | The hippocampus contributes to short-term memory for novel associations at encoding and retrieval but apparently not during active maintenance. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[5] |
| finding | Finding a hippocampal subsequent-memory effect at test as well as at sample excludes the alternative that sample-phase activity merely reflected encoding of the individual objects rather than the object-location associations. Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.findings[6] |
| quantity | 33% — chance level of correct responses in the three-alternative test classification Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[0] |
| quantity | 78, 65, and 60% — accuracy on match, mismatch-position and mismatch-swap displays respectively Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[1] |
| quantity | 11 s — length of the delay over which the rotated scene had to be maintained Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[2] |
| quantity | four objects (out of a set of nine objects), nine possible locations — composition of each sample scene: four of nine objects placed in nine possible grid positions Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.quantities[3] |
| variable | types of test trials (independent) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.variables[0] |
| variable | memory for the positions (dependent) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.variables[1] |
| variable | hippocampal activation (dependent) Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.variables[2] |
| definition | short-term memory Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[0] |
| definition | match-mismatch detector Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[1] |
| definition | short-term memory Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[3] |
| definition | comparator Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[4] |
| definition | allocentric Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[5] |
| definition | egocentric Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[6] |
| definition | match enhancement Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[7] |
| definition | Journal Club Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher. | content_tags.definitions[8] |
| key-terms | short-term memory, long-term memory, hippocampus, medial temporal lobe, perirhinal cortex, entorhinal cortex, relational binder, comparator, subsequent memory, allocentric, egocentric, match enhancement, novelty, familiarity, active maintenance, hippocampal amnesia |
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