x 10 9 may be x 10⁹, chi 2 5 may be chi-squared with five degrees of freedom, and 1 2 may be one half. Read any expression here against the published paper before relying on it.phenomenon · claim-type · cross-domain-transfer · mechanism · claim-relation · replication-status · limitation — grounded in the full text| phenomenon | hippocampal ensemble reactivation during sleep— “On the hypothesis that hippocampal activity during sleep reflects the reactivation of population events representing the experiences of the prior waking behavior, cell pairs that were coactive during the RUN phase (because of their place field overlap) were examined during the POST phase and compared with cell pairs that were active but not… | |
| claim-type | existence— “Cells that were coactive during behavior showed a significant increase in correlation from their PRE level compared to pairs in which both cells displayed spatial firing but not in the same region of space (11).” | |
| method — evidence | — “With the use of multielectrcde recording techniques (4), the activity of 50 to 100 single cells in area CAI of the hippocampus was monitored simultaneously during sleep periods before and after brief behavioral episodes (Fig. 1).” | |
| object of study — evidence | — “Spike-train cross-correlations were computed for all pairs of principal cells during the pre-behavioral sleep (PRE) , running (RUN), and post-behavioral sleep (POST) periods.” | |
| research question — evidence | ||
| contribution — evidence | 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. | |
| mechanism | Waking experience drives associative synaptic modification, which leaves cells that were coactive during behaviour more likely to be reactivated together in subsequent slow-wave sleep 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 | Event memory is first stored by rapid synaptic modification in the hippocampus, and is then replayed during slow-wave sleep (when further hippocampal modification is suppressed) so that the information is gradually transferred to neocortex 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 | Initial storage of the event occurs through rapid synaptic modification primarily within the hippocampus itself 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 | an autoassociative network in which RECURRENT EXCITATION reproduces a stored activity pattern from very little input - so background noise alone can push the network into a stored state, seen as a population burst 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 | random background noise occasionally lands the network in a correlated state, and the resulting population bursts ARE the ripples - the paper's account of why the effect appears in discrete events rather than continuously 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 | storage is fast synaptic modification in the hippocampus during waking; sleep is the playback, and the transfer target is neocortex 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] |
| builds-on | previous theoretical models of autoassociative memory (ref. 6) 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] |
| extends | the large-ensemble recording method itself, used here because the number of observable pair-wise interactions grows as the square of the cells recorded - the argument that makes an experience-specific effect measurable at all 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] |
| critiques | the indirect synaptic-efficacy evidence for hippocampal learning, on the ground that no change had been shown that was SPECIFIC to a given experience 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] |
| supports | autoassociative network models in which recurrent excitation reconstructs a stored pattern from little 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. | claim_relations[3] |
| sense | reactivation - AS MEASURED HERE: an increase in the short-latency cross-correlation of a cell PAIR from PRE to POST sleep. Not a replayed sequence, not a retrieved memory, not a hippocampal event specifically - the instrument sees a pair statistic and the title names a memory. The paper marks that gap twice rather than closing it 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, AS THE PAPER USES IT HERE: `the structure of distributed representations of the visited locations`, retained across sleep. The definition is spatial and population-level, and it is what the overlap-sorted pairs operationalise 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 | ripple - a synchronised intermittent burst during slow-wave sleep, identified with the EEG sharp wave. Used here as the WINDOW in which the correlation effect is concentrated, and as the network signature of a stored pattern being re-entered 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 | the ripple/inter-ripple split - the paper's own test of where in sleep the effect lives. The design is stated plainly; its RESULT is the one sentence in this record that OCR damage puts out of reach, and the control below says so rather than borrowing a verdict from its neighbour 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] |
| control | cell pairs that were ACTIVE during running but NOT COACTIVE - non-overlapping place fields - are measured through the same PRE and POST sleep sessions as the coactive pairs — held 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. — rules out any explanation that would raise correlations across the board: arousal, electrode drift, general post-behaviour excitability, or a recording artefact of the sleep session itself 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. | controls[0] |
| control | the RUN phase is checked first for the effect the sorting assumes - that overlapping place fields do produce correlated firing and non-overlapping ones do not — held 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. — rules out a sort that does not separate what it claims to, which would make the POST comparison meaningless in either direction 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. | controls[1] |
| control | the correlation is computed separately DURING ripples and in the intervals between them — absent-not-in-staged-text 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. — rules out an effect spread evenly through sleep, which would not support the proposed burst-based transfer mechanism 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. | controls[2] |
| control | whether the correlation increase can be localised to the hippocampus at all — absent-declared-unreported 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. — rules out nothing - the paper states the modification may be at some other stage in the system 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. | controls[3] |
| weight | the large-ensemble recording method itself, used here because the number of observable pair-wise interactions grows as the square of the cells recorded - the argument that makes an experience-specific effect measurable at all — 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. | claim_relations[1] |
| weight | the indirect synaptic-efficacy evidence for hippocampal learning, on the ground that no change had been shown that was SPECIFIC to a given experience — 0.85 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] |
| weight | autoassociative network models in which recurrent excitation reconstructs a stored pattern from little input — 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. | claim_relations[3] |
| outcome | control — held 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. | controls[0] |
| outcome | control — held 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. | controls[1] |
| outcome | control — absent-not-in-staged-text 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. | controls[2] |
| outcome | control — absent-declared-unreported 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. | controls[3] |
| replication | untested | |
| limitation | The increased correlation implies associative synaptic change somewhere in the system, but not necessarily inside 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. | limitations[0] |
| limitation | Neocortical or subcortical changes are an alternative source of the increased correlations. 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 PAPER REFUSES TO LOCATE ITS OWN MECHANISM. The increased correlation is called consistent with associative synaptic modification `at some stage in the system, although not necessarily in the hippocampus` - the structure it recorded from 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 | a PAIR-WISE correlation cannot show that the activity is organised into a coherent representation; the paper says the prior single-cell result was suggestive and could not settle it, which is the same limit its own measure has 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 population encoding any one event is expected to be small, so the whole design depends on recording enough cells for the pair count to grow as the square 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 CA1 cells that fired together during a spatial behavioural task showed increased tendency to fire together in the sleep that followed, relative to the sleep that preceded the task. 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 | The increase was specific to coactive pairs: cells silent during behaviour, and active cells whose place fields did not overlap, showed no such increase. 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 | Coactive (overlapping place field) pairs rose significantly above their pre-behaviour correlation level, whereas pairs of spatially firing cells with non-overlapping fields did not. 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 | The reactivation effect decayed across the post-behaviour sleep session with a time constant of about 12 minutes. 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 sleep correlations were concentrated in the synchronized population bursts (ripples) rather than in the intervals between them. 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 | During running, cells with overlapping place fields were strongly positively correlated while non-overlapping pairs were not, confirming the grouping used for the sleep comparison. 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 | 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] |
| 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. | content_tags.findings[7] |
| 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. | content_tags.findings[8] |
| 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. | content_tags.findings[9] |
| 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. | content_tags.findings[10] |
| quantity | approximately 12 min — time constant of the decay of the reactivated correlation during post-behaviour sleep 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 | rat 1: 49 cells; rat 2: 74 cells; rat 3: 69 cells — number of simultaneously recorded hippocampal pyramidal cells in each of the three rats 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 | 50 to 100 — number of single CA1 cells monitored simultaneously in each recording session 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 | NON 437 and OVR 60; NON 719 and OVR 95; NON 941 and OVR 147 — numbers of non-overlapping versus overlapping cell pairs contributing to the histograms for rats 1, 2 and 3 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] |
| quantity | P < 0.05 — significance level at which the post-run correlation increase for coactive pairs was established by ANOVA 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[4] |
| quantity | approximately 20 min — duration of each of the PRE, RUN and POST recording periods 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[5] |
| quantity | minutes - the approximate duration of each of the three phases, PRE, RUN and POST 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[6] |
| variable | amount of overlap (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[1] |
| variable | cross-correlation of spike trains (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] |
| variable | significant spatial firing (control) 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[3] |
| variable | place fields 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[4] |
| variable | overlap 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[5] |
| definition | ripples 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 | autoassociative 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[2] |
| concept | place fields — not defined in this paper's own words; the spatial firing distribution of a cell during running - the variable pairs are sorted by, and therefore the operational definition of 'same experience' here 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. | concepts[0] |
| concept | cross-correlations — not defined in this paper's own words; short-latency coincidence of two spike trains, computed per pair per phase - the only quantity this paper measures 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. | concepts[1] |
| concept | ripples — not defined in this paper's own words; intermittent synchronised bursts in slow-wave sleep, associated with the EEG sharp wave 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. | concepts[2] |
| concept | autoassociative memory — not defined in this paper's own words; a network that reproduces a stored pattern from partial input by recurrent excitation - the model the observed bursts are read through 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. | concepts[3] |
| concept | synaptic modification — not defined in this paper's own words; the postulated cause of the correlation increase, and the thing the paper declines to place in 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. | concepts[4] |
| ANOVA P | as written: analysis of variance 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.statistics[0] |
| cross-correlation | as written: Spike-train cross-correlations 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.statistics[1] |
| mean | as written: Mean crosscorrelations 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.statistics[2] |
| cross-correlations | 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.statistics[3] |
| correlation | 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.statistics[4] |
| claim type | existence — a second reading reaching the same value; recorded: existence 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. | alternatives.claim_type |
| method | simultaneous recording of 50 to 100 CA1 cells, short-latency spike-train cross-correlation computed per pair over each of three phases, pairs sorted by how much their place fields overlap — a second reading DIFFERING from the recorded value; recorded: electrophysiology 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. | alternatives.method |
| phenomenon | experience-specific reactivation - coactivity acquired during waking behaviour re-expressed in hippocampal circuits during subsequent slow-wave sleep — a second reading DIFFERING from the recorded value; recorded: hippocampal ensemble reactivation during sleep 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. | alternatives.phenomenon |
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.
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