phenomenon · claim-type · cross-domain-transfer · mechanism · claim-relation · replication-status · limitation — grounded in the full text| phenomenon | medial temporal lobe neuronal correlates of recognition and associative memory— “To address this question, we examine the neurophysiological correlates of both recognition and associative memory in the medial temporal lobe of humans, monkeys, and rats.” | |
| claim-type | existence— “These cross-species comparisons show that the patterns of mnemonic activity observed throughout the medial temporal lobe are largely conserved across species.” | |
| method — evidence | — “In this chapter, we review the neurophysiological findings that address these two main points.” | |
| mechanism | Because the hippocampus receives polymodal rather than unimodal input, it is positioned to combine the cortex's stimulus-selective signals into complex conjunctions or to abstract a general output signal from them, which is why its mnemonic code is abstracted rather than stimulus-specific— “The hippocampus is in a privileged position to either combine the stimulus-selective mnemonic information in cortex into more complex conjunctions or to abstract, from the stimulus-selective information, a more general “output” signal.” | mechanisms[0] |
| mechanism | The occasional stimulus-selective, cortex-type recognition signals seen in the hippocampus are inherited through the direct anatomical projections from perirhinal and entorhinal cortex to area CA1— “These “cortexlike” recognition signals may be conveyed via the direct projections from both the perirhinal and the entorhinal cortices to area CA1.” | mechanisms[1] |
| mechanism | At long delays interference builds up, so contextual/episodic conjunctive information becomes the useful cue for recognition, which is why hippocampal damage bites hardest at long delays— “At longer delay intervals, when interference can play a detrimental role, information about the context or episode in which the stimulus was seen could be particularly helpful to successful performance.” | mechanisms[2] |
| mechanism | Cortical stimulus-stimulus association works by a cue acquiring the capacity to generate the neural representation of the stimulus it was paired with, producing pair-coding and pair-recall firing— “Thus, within these cortical areas, stimulus-stimulus associations may be represented by the acquired capacity of a stimulus to generate the neural representation of another stimulus with which it has been associated.” | mechanisms[3] |
| builds-on | Sakai and Miyashita (ref. 52), pair-coding neurons; and Wood et al. (ref. 37), conjunctive coding neurons— “Yet the evidence showing differences between these areas suggests that parahippocampal cortical neurons may participate in associative memory by developing representations of complex perceptual stimuli that can be activated by their associates (i.e., pair-coding neurons of Sakai and Miyashita52), whereas neurons of the hippocampal formation… | claim_relations[0] |
| sense | the anatomical argument - TWO OPPOSITE PREDICTIONS FROM THE SAME STRUCTURES: differing convergent cortical input is read as predicting distinct mnemonic patterns per area, and strong parallel projections as predicting shared access to similar information; both are stated, so neither a difference nor a similarity result can discriminate between them— “On the one hand, the fact that each of these structures differs markedly in the amount and content of convergent cortical input suggests that each area may be able to process or combine information to encode, store, or retrieve memory in different ways. This view suggests that each area may be characterized by distinct patterns of mnemonic… | senses[0] |
| sense | match enhancement - A PROPORTION THAT MOVES WITH THE PROTOCOL: substantially more neurons show it in the ABBA version of the task than in the standard version, so 'how many neurons do X' is a fact about the task that was run as much as about the tissue— “However, the proportion of neurons exhibiting match enhancement was substantially higher during performance of the ABBA version of the task compared to the standard version” | senses[1] |
| sense | neuropsychological evidence - INDIRECT BY THE AUTHORS' OWN DESCRIPTION: lesion work on patients and animals is said to provide only indirect insight into the specific patterns of neural activity, which is why the review turns to recording— “neuropsychological studies on braindamaged patients or experimental animals can provide only indirect insights into the specific patterns of neural activity that allow us to form and retain new long-term declarative memories” | senses[2] |
| effect direction | ABBA version —causes→ match enhancement — increases— “However, the proportion of neurons exhibiting match enhancement was substantially higher during performance of the ABBA version of the task compared to the standard version”— “the proportion of neurons exhibiting match enhancement was substantially higher” | concept_edges[0] |
| for which use | limitation — the anatomical coverage of the review, and the field's coverage it reflects: MUCH LESS IS KNOWN ABOUT THE PATTERNS OF MNEMONIC ACTIVITY IN THE PARAHIPPOCAMPAL/POSTRHINAL CORTEX, AND THEREFORE THIS REGION WILL NOT BE DISCUSSED— “Much less is known about the patterns of mnemonic activity in the parahippocampal/postrhinal cortex, and therefore this region will not be discussed.” | limitations[0] |
| for which use | limitation — any comparison across testing conditions: A COMPELLING DIRECT COMPARISON THAT REVEALS THE CRITICAL ASPECTS OF THESE DIFFERENT TESTING CONDITIONS HAS YET TO BE MADE— “A compelling direct comparison that reveals the critical aspects of these different testing conditions has yet to be made.” | limitations[1] |
| for which use | limitation — the reach of the associative-memory account: ADDITIONAL COMPARATIVE STUDIES ARE NEEDED TO DETERMINE THE FULL SCOPE OF NEURAL SIGNALS UNDERLYING ASSOCIATIVE MEMORY ACROSS THE MEDIAL TEMPORAL LOBE— “Additional comparative studies are needed to determine the full scope of neural signals underlying associative memory across the medial temporal lobe.” | limitations[2] |
| for which use | limitation — the rat delay-activity literature specifically: THE EFFECT OF INTERVENING STIMULI ON THE SELECTIVE DELAY ACTIVITY IN THE PERIRHINAL OR ENTORHINAL CORTICES OF RATS HAS NOT BEEN EXAMINED— “The effect of intervening stimuli on the selective delay activity in the perirhinal or entorhinal cortices of rats has not been examined.” | limitations[3] |
| for which use | limitation — any finding of regional difference in the medial temporal lobe: the review argues from differing convergent cortical input that each area may be characterised by distinct patterns of mnemonic activity, and separately argues from parallel projections that all these regions access similar information— “On the one hand, the fact that each of these structures differs markedly in the amount and content of convergent cortical input suggests that each area may be able to process or combine information to encode, store, or retrieve memory in different ways. This view suggests that each area may be characterized by distinct patterns of mnemonic… | limitations[4] |
| for which use | limitation — any proportion of match-enhancement neurons quoted from this work: the proportion was substantially higher during the ABBA version of the task than during the standard version— “However, the proportion of neurons exhibiting match enhancement was substantially higher during performance of the ABBA version of the task compared to the standard version” | limitations[5] |
| for which use | limitation — any inference from lesion studies to patterns of neural activity: the authors state that neuropsychological studies of brain-damaged patients or experimental animals provide only indirect insights into the specific patterns of activity underlying declarative memory— “neuropsychological studies on braindamaged patients or experimental animals can provide only indirect insights into the specific patterns of neural activity that allow us to form and retain new long-term declarative memories” | limitations[6] |
| replication | untested | |
| limitation | The parahippocampal/postrhinal cortex is excluded from the review because too little is known about its mnemonic activity.— “Much less is known about the patterns of mnemonic activity in the parahippocampal/postrhinal cortex, and therefore this region will not be discussed.” | limitations[0] |
| limitation | No direct comparison exists that would identify which testing conditions produce similar versus different coding in cortex and hippocampus.— “A compelling direct comparison that reveals the critical aspects of these different testing conditions has yet to be made.” | limitations[1] |
| limitation | The scope of associative-memory signals across the medial temporal lobe is not yet established.— “Additional comparative studies are needed to determine the full scope of neural signals underlying associative memory across the medial temporal lobe.” | limitations[2] |
| limitation | A specific empirical gap: intervening stimuli have not been tested against selective delay activity in rat perirhinal/entorhinal cortex. | limitations[3] |
| limitation | The anatomy is used to support two opposite expectations, both stated in the same passage. | limitations[4] |
| limitation | How many neurons show the effect depends on which version of the task was run. 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[5] |
| limitation | The neuropsychological literature is stated to give only indirect insight into neural activity. 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[6] |
finding · quantity · variable · definition · key-term — grounded in the full text| finding | Across humans, monkeys and rats the patterns of memory-related firing in the medial temporal lobe are largely the same, so mnemonic signals are conserved across species. 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 | Unlike the stimulus-selective recognition signals of cortex, hippocampal-formation neurons convey abstracted recognition memory signals. 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 | Selective delay activity in perirhinal cortex was disrupted by even a single intervening stimulus. 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 | Match-enhancement neurons were enhanced only when the behaviourally relevant stimulus was repeated. 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 | Match suppression is not sensory fatigue or habituation, because the suppression is abolished when the same stimulus reappears as the sample on the next trial. 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 | Hippocampal neurons nearly always showed different, independent spatial firing patterns in the two environments. 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 | Damage limited to the hippocampus produces the most striking recognition impairments at long delays of many minutes to hours. 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 | About a third to two fifths of human hippocampal (35%) and entorhinal (40%) neurons recorded at retrieval were influenced by whether the item was new or old. 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 | Pair-recall neurons increased firing during the delay after the associate of their optimal cue, leading up to a robust response to that cue. 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] |
| quantity | 47% ... 94% — proportion of visually responsive monkey entorhinal (47%) versus perirhinal (94%) neurons that respond selectively to particular visual stimuli 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 | 35% ... 11% — proportion of sampled rat lateral entorhinal (35%) versus perirhinal (11%) neurons with odor-specific firing 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 | 15 of 120 or 12.5% — share of responsive hippocampal neurons that differentiated match from nonmatch presentations 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 | 13 of 91 or 14% — share of responsive rat hippocampal neurons carrying an abstracted match-nonmatch signal independent of odor identity 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 | 18 of 91 or 20% ... 4 of 91 or 4% — share of responsive hippocampal neurons coding match-nonmatch status conjointly with position (20%), or with both position and odor identity (4%) 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 | 24 hours — longest delay across which repetition suppression to a once-novel stimulus persists 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 | 74 neurons in 3 regions — size of the human single-unit sample in the recognition study whose results matched the animal cortical pattern 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] |
| quantity | 24 — number of fractal stimulus patterns used in the paired-associate study of inferotemporal and perirhinal neurons 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[7] |
| quantity | between 1 and 10 hours — encoding-to-retrieval interval in the human single-unit recognition task, a delay known to challenge amnesic patients 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[8] |
| variable | physical characteristics (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[1] |
| variable | location of the odor presentation (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] |
| definition | associative 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 | priming 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 | hippocampal formation 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] |
| definition | "abstracted" recognition 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. | content_tags.definitions[3] |
| definition | conjunctive coding 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 | familiarity 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. | content_tags.definitions[6] |
| concept | 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. | concepts[0] |
| concept | ABBA version 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 | convergent cortical 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. | concepts[2] |
| concept | parallel projections 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 | declarative memories 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] |
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