The what, where and how of delay activity

Sreenivasan, D’Esposito · Nature Reviews Neuroscience · 2019 · neuroscience · 10.1038/s41583-019-0176-7 · record Sreenivasan2019-the-what-where-and-how-of-delay-activity
tag layer · index · concepts · authors · עברית

Where this record's text came from. faceted 2026-08 by reading the locally held text (xml); every evidence string verified as an exact substring of that text before merging. Claim relations is empty on purpose. The article is a narrative review and cites prior work by superscript number; where names do appear (e.g. Fuster and Alexander, Kubota and Niki, Lundqvist et al.) they are used to describe other people's findings, not to state a relation between this Review's own claim and that work, so nothing met the 'explicitly relates itself to named prior work' bar. The review does report existing disputes it did not itself adjudicate (e.g. whether gamma bursts merely reflect spiking, and the challenge to the sensory recruitment model); replication status is left untested because the paper makes no replication claim about its own thesis. 2026-08-13 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.

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Other fields define these differently the same word, defined another way in another discipline
EEG 4 fields · species 3 fields · task 2 fields · bistability 2 fields · fMRI 2 fields · WM 2 fields

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 15 concept tags on this paper, none is 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.

delay activity WM lPFC technique scale species task region averaging burst gamma beta mixed selectivity EEG fMRI Structured recurrent excitation with tuned excitation–inhibition balance lets network spiking settle into a self-sustaining attractor state that keeps the memory alive without input Slow NMDA-receptor excitation stabilises attractor networks so that persistent spiking can be maintained over seconds Encoding-driven changes in synaptic weights turn the network into a matched filter, so the memory is stored silently and revealed when noisy input is fed through it Feedforward connections between similarly tuned cells relay brief bursts of spiking along a chain, storing information without any single cell firing continuously Long-range input (from thalamus) is required for local cortical circuits to sustain delay activity at all delay spiking population coding bistability activity silent models nonlinear mixed selectivity sensory recruitment model review

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second reading	`alternatives`	an independent re-reading of a facet, recorded whether or not it agrees
relation to other work	`claim_relations`	how this paper stands to another: agrees, contradicts, extends, qualifies
claim type	`claim_type`	the shape of the claim: existence, mechanism, method, critique, prediction, null
concept edge	`concept_edges`	an asserted relation between two concepts, with the sentence asserting it
content tag	`content_tags`	a finding, definition, quantity, statistic or variable named in the paper
contribution	`contribution`	what the paper claims to add
control	`controls`	an experiment run to eliminate a rival explanation
limitation	`limitations`	what the paper says its evidence cannot support
mechanism	`mechanisms`	how the reported effect is said to come about
method	`method`	how the paper produced its evidence
object of study	`object_of_study`	what the paper is about — the thing it investigates
phenomenon	`phenomenon`	the effect or regularity under study
research question	`research_question`	the question the paper sets itself
sense	`senses`	a 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/10.1038/s41583-019-0176-7. The reading view exists for the papers whose licence permits it.

Every tag on this page

alternatives 3 · claim_relations 4 · claim_type 1 · concept_edges 3 · content_tags 31 · contribution 1 · controls 1 · limitations 9 · mechanisms 8 · method 1 · object_of_study 1 · phenomenon 1 · research_question 1 · senses 14

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 3 relations here carry that mark. The rest are the tagger’s reading of the sentence quoted beside them.

facet	tag	field	conf.	whose words
object_of_study	DELAY ACTIVITY - NEURAL ACTIVITY THAT PERSISTS DURING THE RETENTION INTERVAL OF DELAY TASKS, reconsidered as to WHAT IT IS, WHERE IN THE BRAIN IT IS FOUND, WHAT ROLES IT SERVES AND HOW IT MAY BE GENERATED Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`object_of_study`		the paper's words
research_question	what the object even is, once the methods have changed - METHODOLOGICAL AND ANALYTICAL ADVANCES HAVE ALLOWED RESEARCHERS TO UNCOVER PREVIOUSLY UNOBSERVED FORMS OF DELAY ACTIVITY ACROSS THE ENTIRE BRAIN Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`research_question`		the paper's words
contribution	an expanded definition - ANY TASK-RELATED CHANGE IN NEURAL ACTIVITY THAT SPANS THE INTERVAL BETWEEN A STIMULUS AND THE BEHAVIOURAL RESPONSE IN A WM DELAY TASK - and an account of what it costs Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`contribution`		the paper's words
claim_type	critique Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`claim_type`		the paper's words
phenomenon	delay activity in working memory Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`phenomenon`		the paper's words
method	review Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: review	`method`		the paper's words
mechanisms	mechanisms Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: Structured recurrent excitation with tuned excitation–inhibition balance lets network spiking settle into a self-sustaining attractor state that keeps the memory alive without input	`mechanisms[0]`		the tagger's words
mechanisms	mechanisms Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: Slow NMDA-receptor excitation stabilises attractor networks so that persistent spiking can be maintained over seconds	`mechanisms[1]`		the tagger's words
mechanisms	mechanisms Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: Encoding-driven changes in synaptic weights turn the network into a matched filter, so the memory is stored silently and revealed when noisy input is fed through it	`mechanisms[2]`		the tagger's words
mechanisms	mechanisms Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: Feedforward connections between similarly tuned cells relay brief bursts of spiking along a chain, storing information without any single cell firing continuously	`mechanisms[3]`		the tagger's words
mechanisms	mechanisms Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: Long-range input (from thalamus) is required for local cortical circuits to sustain delay activity at all	`mechanisms[4]`		the tagger's words
mechanisms	the definition is widened deliberately and its price is named in the same sentence: THIS EXPANDED DEFINITION ALLOWS FOR A MORE INCLUSIVE AND COMPREHENSIVE EVALUATION OF DELAY ACTIVITY, BUT AT THE SAME TIME CALLS ATTENTION TO THE CHALLENGE OF COMPARING DATA ACROSS DIFFERENT EXPERIMENTAL METHODS, BRAIN REGIONS AND SPECIES Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`mechanisms[5]`	1.0	the tagger's words
mechanisms	and the one design that escapes the problem: WE ADDRESS THIS ISSUE BY HIGHLIGHTING STUDIES THAT RECORD DELAY ACTIVITY ACROSS MULTIPLE BRAIN REGIONS IN THE SAME EXPERIMENT Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`mechanisms[6]`	1.0	the tagger's words
mechanisms	a code that cannot be read from its parts: Quotation withheld AND INSTEAD ARE ENCODED IN THE COMBINED ACTIVITY OF SEVERAL NEURONS Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`mechanisms[7]`	1.0	the tagger's words
limitations	DELAY ACTIVITY IS SEEN MORE GENERALLY IN CONTEXTS THAT REQUIRE AN ORGANISM TO LINK A SENSORY STIMULUS TO A DELAYED BEHAVIOUR, SUCH AS DURING TASKS OF SUSTAINED ATTENTION OR DECISION MAKING; HERE, HOWEVER, WE EXAMINE DELAY ACTIVITY IN TASKS EXPLICITLY TESTING WM, WHERE IT HAS BEEN CHARACTERIZED MOST EXTENSIVELY Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: the attribution of delay activity to working memory: DELAY ACTIVITY IS SEEN MORE GENERALLY IN CONTEXTS THAT REQUIRE AN ORGANISM TO LINK A SENSORY STIMULUS TO A DELAYED BEHAVIOUR, SUCH AS DURING TASKS OF SUSTAINED ATTENTION OR DECISION MAKING	`limitations[0]`		the tagger's words
limitations	The broad definition the review adopts makes comparison across methods, regions and species harder. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: every comparison the review makes under its own definition: it ALLOWS FOR A MORE INCLUSIVE AND COMPREHENSIVE EVALUATION ... BUT AT THE SAME TIME CALLS ATTENTION TO THE CHALLENGE OF COMPARING DATA ACROSS DIFFERENT EXPERIMENTAL METHODS, BRAIN REGIONS AND SPECIES	`limitations[1]`		the tagger's words
limitations	AS THE RELATIONSHIP BETWEEN THE BIOPHYSICAL PROPERTIES OF NEURONS OR MICRO-SCALE NETWORKS AND THE EFP OR BOLD SIGNALS IS INCOMPLETELY UNDERSTOOD, BIOPHYSICAL MODELS ALMOST EXCLUSIVELY ATTEMPT TO DESCRIBE SPIKING ACTIVITY; ACCORDINGLY, WE FOCUS OUR DISCUSSION HERE ON DELAY SPIKING Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: the coverage of the biophysical modelling literature: AS THE RELATIONSHIP BETWEEN THE BIOPHYSICAL PROPERTIES OF NEURONS OR MICRO-SCALE NETWORKS AND THE EFP OR BOLD SIGNALS IS INCOMPLETELY UNDERSTOOD, BIOPHYSICAL MODELS ALMOST EXCLUSIVELY ATTEMPT TO DESCRIBE SPIKING	`limitations[2]`		the tagger's words
limitations	the expanded definition makes the literature harder to compare, not easier - THE CHALLENGE OF COMPARING DATA ACROSS DIFFERENT EXPERIMENTAL METHODS, BRAIN REGIONS AND SPECIES Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: pooling delay-activity findings across techniques without asking what each technique can see	`limitations[3]`	1.0	the tagger's words
limitations	DIFFERENCES IN TASKS, METHODOLOGY AND SPECIES IN THE ABOVE STUDIES POSE A SIGNIFICANT OBSTACLE TO UNCOVERING THE LOCATION AND FUNCTION OF DELAY ACTIVITY Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: the localisation and function questions the review is asking: DIFFERENCES IN TASKS, METHODOLOGY AND SPECIES IN THE ABOVE STUDIES POSE A SIGNIFICANT OBSTACLE TO UNCOVERING THE LOCATION AND FUNCTION OF DELAY ACTIVITY	`limitations[4]`	1.0	the tagger's words
limitations	each instrument sees a different thing - RECORDING DELAY ACTIVITY AT THESE DIFFERENT SCALES REQUIRES MULTIPLE TECHNIQUES, EACH OF WHICH IS SENSITIVE TO DIFFERENT ASPECTS OF THE UNDERLYING NEURONAL SIGNALS Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: treating a delay signal recorded one way as the same object as one recorded another way	`limitations[5]`	1.0	the tagger's words
limitations	and for one of those instruments the source is unknown - CHALLENGES IN LOCALIZING EEG ACTIVITY MAKE IT UNCLEAR WHERE IN THE BRAIN THESE SIGNALS ORIGINATE Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: the EEG evidence specifically: CHALLENGES IN LOCALIZING EEG ACTIVITY MAKE IT UNCLEAR WHERE IN THE BRAIN THESE SIGNALS ORIGINATE	`limitations[6]`	1.0	the tagger's words
limitations	the interpretation of the burst data is contested - Quotation withheld Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. what this limits: the LFP burst evidence: Quotation withheld	`limitations[7]`	1.0	the tagger's words
limitations	and for one of those instruments the source is unknown - CHALLENGES IN LOCALIZING EEG ACTIVITY MAKE IT UNCLEAR WHERE IN THE BRAIN THESE SIGNALS ORIGINATE Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`limitations[8]`	1.0	the tagger's words
controls	the review restricted, where possible, to experiments that record several regions at once Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. eliminates: differences between studies masquerading as differences between regions - WE ADDRESS THIS ISSUE BY HIGHLIGHTING STUDIES THAT RECORD DELAY ACTIVITY ACROSS MULTIPLE BRAIN REGIONS IN THE SAME EXPERIMENT · outcome (stated by the tagger, no quotation): partial	`controls[0]`	1.0	the tagger's words
senses	THE DEFINITION IS WIDENED IN THE SECOND PARAGRAPH, AND THE COST IS IN THE SAME SENTENCE: Quotation withheld - THIS EXPANDED DEFINITION ALLOWS FOR A MORE INCLUSIVE AND COMPREHENSIVE EVALUATION OF DELAY ACTIVITY, BUT AT THE SAME TIME CALLS ATTENTION TO THE CHALLENGE OF COMPARING DATA ACROSS DIFFERENT EXPERIMENTAL METHODS, BRAIN REGIONS AND SPECIES Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[0]`	1.0	the tagger's words
senses	and what it replaces is named: DISCUSSIONS OF DELAY ACTIVITY THAT TYPICALLY FOCUS ON INCREASES IN SPIKE RATE OR FUNCTIONAL MRI (fMRI) SIGNAL THAT PERSIST THROUGHOUT A WM DELAY. The older definition is a MEASUREMENT; the new one is a RELATION to the task Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[1]`	1.0	the tagger's words
senses	THE PHENOMENON GREW WHEN THE INSTRUMENTS CHANGED: ALTHOUGH INITIALLY THERE WAS A NARROW FOCUS ON SUSTAINED ACTIVATION IN A SMALL NUMBER OF BRAIN REGIONS, METHODOLOGICAL AND ANALYTICAL ADVANCES HAVE ALLOWED RESEARCHERS TO UNCOVER PREVIOUSLY UNOBSERVED FORMS OF DELAY ACTIVITY ACROSS THE ENTIRE BRAIN Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[2]`	1.0	the tagger's words
senses	and each instrument sees a different thing: RECORDING DELAY ACTIVITY AT THESE DIFFERENT SCALES REQUIRES MULTIPLE TECHNIQUES, EACH OF WHICH IS SENSITIVE TO DIFFERENT ASPECTS OF THE UNDERLYING NEURONAL SIGNALS Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[3]`	1.0	the tagger's words
senses	THE CLASSIC RESULT IS A PRODUCT OF THE AVERAGE: ONLY AFTER AVERAGING ACTIVITY OVER TRIALS DID THE CLASSIC PATTERNS OF SUSTAINED GAMMA AND BETA ENHANCEMENT EMERGE. The sustained pattern that named the phenomenon is not present in any single trial Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[4]`	1.0	the tagger's words
senses	and the underlying signal is disputed: Quotation withheld Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[5]`	1.0	the tagger's words
senses	THE OBSTACLE IS THE SAME THREE THINGS EVERY TIME: DIFFERENCES IN TASKS, METHODOLOGY AND SPECIES IN THE ABOVE STUDIES POSE A SIGNIFICANT OBSTACLE TO UNCOVERING THE LOCATION AND FUNCTION OF DELAY ACTIVITY Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[6]`	1.0	the tagger's words
senses	and the only clean design is named: WE ADDRESS THIS ISSUE BY HIGHLIGHTING STUDIES THAT RECORD DELAY ACTIVITY ACROSS MULTIPLE BRAIN REGIONS IN THE SAME EXPERIMENT - compare within one experiment, because between experiments the comparison is not available Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[7]`	1.0	the tagger's words
senses	A CODE THAT CANNOT BE READ FROM ITS PARTS: NONLINEAR MIXED SELECTIVITY ENABLES INDIVIDUAL NEURONS TO RESPOND TO COMBINATIONS OF TASK AND STIMULUS FEATURES SUCH THAT FEATURE COMBINATIONS CANNOT BE READ OUT FROM THE RESPONSES OF THE INDIVIDUAL NEURON ALONE AND INSTEAD ARE ENCODED IN THE COMBINED ACTIVITY OF SEVERAL NEURONS. A per-neuron tag cannot carry what the population encodes Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[8]`	1.0	the tagger's words
senses	and it is offered as a reconciliation of two positions: ATTEMPTS TO RECONCILE THESE PERSPECTIVES HAVE GIVEN RISE TO A MORE NUANCED VIEW, THAT lPFC DELAY ACTIVITY SIMULTANEOUSLY REPRESENTS MULTIPLE DIMENSIONS OF WM CONTENT AND GOALS Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[9]`	1.0	the tagger's words
senses	AND FOR ONE INSTRUMENT THE SOURCE OF THE SIGNAL IS UNKNOWN: CHALLENGES IN LOCALIZING EEG ACTIVITY MAKE IT UNCLEAR WHERE IN THE BRAIN THESE SIGNALS ORIGINATE - so a `where` claim from that instrument is not a claim about a place Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[10]`	1.0	the tagger's words
senses	the review's own framing of what it is doing: IN LIGHT OF THESE NEW FINDINGS, THIS REVIEW RECONSIDERS WHAT DELAY ACTIVITY IS, WHERE IN THE BRAIN IT IS FOUND, WHAT ROLES IT SERVES AND HOW IT MAY BE GENERATED Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[11]`	1.0	the tagger's words
senses	and it is offered as a reconciliation of two positions: ATTEMPTS TO RECONCILE THESE PERSPECTIVES HAVE GIVEN RISE TO A MORE NUANCED VIEW, THAT lPFC DELAY ACTIVITY SIMULTANEOUSLY REPRESENTS MULTIPLE DIMENSIONS OF WM CONTENT AND GOALS Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[12]`	1.0	the tagger's words
senses	AND FOR ONE INSTRUMENT THE SOURCE OF THE SIGNAL IS UNKNOWN: CHALLENGES IN LOCALIZING EEG ACTIVITY MAKE IT UNCLEAR WHERE IN THE BRAIN THESE SIGNALS ORIGINATE - so a `where` claim from that instrument is not a claim about a place Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`senses[13]`	1.0	the tagger's words
alternatives	claim_type: critique Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. a second reading reaching the same value. Recorded: critique — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.	`alternatives.claim_type`		the tagger's words
alternatives	method: review across scales and techniques, giving weight to studies that record in multiple regions within one experiment because that is the only way to compare Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. a second reading DIFFERING from the recorded value. Recorded: review — note: a second reading, verbatim-verified, disagreeing with the value on the record. Not applied - a person decides.	`alternatives.method`		the tagger's words
alternatives	phenomenon: a fifty-year-old phenomenon whose extent grew when the instruments changed, not when the brain did Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. a second reading DIFFERING from the recorded value. Recorded: delay activity in working memory — note: a second reading, verbatim-verified, disagreeing with the value on the record. Not applied - a person decides.	`alternatives.phenomenon`		the tagger's words
claim_relations	critiques → the narrow definition of delay activity as sustained spike-rate or fMRI increase Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. differs in: what counts as delay activity - ANY TASK-RELATED CHANGE IN NEURAL ACTIVITY THAT SPANS THE INTERVAL BETWEEN A STIMULUS AND THE BEHAVIOURAL RESPONSE	`claim_relations[0]`	1.0	the tagger's words
claim_relations	reconciles → the positions that lPFC delay activity codes content and that it codes goals Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. differs in: the assumption that a neuron codes one thing - NONLINEAR MIXED SELECTIVITY ENABLES INDIVIDUAL NEURONS TO RESPOND TO COMBINATIONS OF TASK AND STIMULUS FEATURES	`claim_relations[1]`	1.0	the tagger's words
claim_relations	qualifies → the classic sustained-enhancement description of delay activity Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. differs in: whether trials are averaged - ONLY AFTER AVERAGING ACTIVITY OVER TRIALS DID THE CLASSIC PATTERNS OF SUSTAINED GAMMA AND BETA ENHANCEMENT EMERGE	`claim_relations[2]`	1.0	the tagger's words
claim_relations	reconciles → the positions that lPFC delay activity codes content and that it codes goals Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. differs in: the assumption that a neuron codes one thing - NONLINEAR MIXED SELECTIVITY ENABLES INDIVIDUAL NEURONS TO RESPOND TO COMBINATIONS OF TASK AND STIMULUS FEATURES	`claim_relations[3]`	1.0	the tagger's words
concept_edges	delay activity —part-of→ WM Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. depends on: which definition is in force - the older one focuses on INCREASES IN SPIKE RATE OR FUNCTIONAL MRI (fMRI) SIGNAL THAT PERSIST THROUGHOUT A WM DELAY · strength of the relation: 1 · note: ANY TASK-RELATED CHANGE IN NEURAL ACTIVITY THAT SPANS THE INTERVAL BETWEEN A STIMULUS AND THE BEHAVIOURAL RESPONSE IN A WM DELAY TASK Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but delay activity is defined as activity spanning a WM delay; part-of is loose. also in: delay activity · WM	`concept_edges[0]`	1.0	the tagger's words
concept_edges	delay activity —operationalised-as→ fMRI Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. strength of the relation: 0.5 — the record marks this weak · note: the definition being replaced: DISCUSSIONS OF DELAY ACTIVITY THAT TYPICALLY FOCUS ON INCREASES IN SPIKE RATE OR FUNCTIONAL MRI (fMRI) SIGNAL THAT PERSIST THROUGHOUT A WM DELAY Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the paper widens delay activity BEYOND spike-rate and fMRI increases; operationalised-as fMRI is loose. also in: delay activity · fMRI	`concept_edges[1]`	1.0	the tagger's words
concept_edges	gamma —contrasted-with→ beta Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. strength of the relation: 1 · note: beta bursts SEEMED TO INHIBIT GAMMA BURSTS AND REDUCED THE INFORMATION CONTENT OF SPIKING ACTIVITY Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span reports gamma bursts; the beta contrast is not in the shown text. also in: gamma · beta	`concept_edges[7]`	1.0	the tagger's words
content_tags	One lateral prefrontal study estimated that only 3% of delay-active neurons spike at a stable rate throughout the delay. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[0]`		the tagger's words
content_tags	Quotation withheld Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[1]`		the tagger's words
content_tags	Optogenetically inhibiting thalamic delay activity disrupted delay activity in frontal regions. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[2]`		the tagger's words
content_tags	Thalamic delay activity is not a copy of the cortical signal — it is less content-selective than frontal delay activity yet causally sets frontal selectivity. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[3]`		the tagger's words
content_tags	Quotation withheld Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[4]`		the tagger's words
content_tags	Which region shows delay activity depends on the animal's strategy: a prospective motor strategy raised prefrontal delay activity while a retrospective sensory strategy raised it in posterior cortex. 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_tags	In monkey lPFC, drift in population delay spiking predicted the size of the behavioural error. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[6]`		the tagger's words
content_tags	Blocking prefrontal NMDA receptors eliminates delay spiking in non-human primates. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[7]`		the tagger's words
content_tags	No single biophysical model reproduces every property of delay activity, and most empirical results are equally compatible with several model classes. Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[8]`		the tagger's words
content_tags	Quotation withheld Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[9]`	1.0	the tagger's words
content_tags	THIS EXPANDED DEFINITION ALLOWS FOR A MORE INCLUSIVE AND COMPREHENSIVE EVALUATION OF DELAY ACTIVITY, BUT AT THE SAME TIME CALLS ATTENTION TO THE CHALLENGE OF COMPARING DATA ACROSS DIFFERENT EXPERIMENTAL METHODS, BRAIN REGIONS AND SPECIES Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[10]`	1.0	the tagger's words
content_tags	METHODOLOGICAL AND ANALYTICAL ADVANCES HAVE ALLOWED RESEARCHERS TO UNCOVER PREVIOUSLY UNOBSERVED FORMS OF DELAY ACTIVITY ACROSS THE ENTIRE BRAIN Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[11]`	1.0	the tagger's words
content_tags	ONLY AFTER AVERAGING ACTIVITY OVER TRIALS DID THE CLASSIC PATTERNS OF SUSTAINED GAMMA AND BETA ENHANCEMENT EMERGE Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[12]`	1.0	the tagger's words
content_tags	DIFFERENCES IN TASKS, METHODOLOGY AND SPECIES IN THE ABOVE STUDIES POSE A SIGNIFICANT OBSTACLE TO UNCOVERING THE LOCATION AND FUNCTION OF DELAY ACTIVITY Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[13]`	1.0	the tagger's words
content_tags	FEATURE COMBINATIONS CANNOT BE READ OUT FROM THE RESPONSES OF THE INDIVIDUAL NEURON ALONE AND INSTEAD ARE ENCODED IN THE COMBINED ACTIVITY OF SEVERAL NEURONS Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[14]`	1.0	the tagger's words
content_tags	CHALLENGES IN LOCALIZING EEG ACTIVITY MAKE IT UNCLEAR WHERE IN THE BRAIN THESE SIGNALS ORIGINATE Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[15]`	1.0	the tagger's words
content_tags	Quotation withheld Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.findings[16]`	1.0	the tagger's words
content_tags	delay spiking Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: delay spiking	`content_tags.definitions[1]`		the tagger's words
content_tags	population coding Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: population coding	`content_tags.definitions[2]`		the tagger's words
content_tags	bistability Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: bistability	`content_tags.definitions[3]`		the tagger's words
content_tags	activity silent models Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: activity silent models	`content_tags.definitions[4]`		the tagger's words
content_tags	nonlinear mixed selectivity Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: nonlinear mixed selectivity	`content_tags.definitions[5]`		the tagger's words
content_tags	sensory recruitment model Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: sensory recruitment model	`content_tags.definitions[6]`		the tagger's words
content_tags	ANY TASK-RELATED CHANGE IN NEURAL ACTIVITY THAT SPANS THE INTERVAL BETWEEN A STIMULUS AND THE BEHAVIOURAL RESPONSE IN A WM DELAY TASK Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: delay activity	`content_tags.definitions[7]`	1.0	the tagger's words
content_tags	individual neurons RESPOND TO COMBINATIONS OF TASK AND STIMULUS FEATURES SUCH THAT FEATURE COMBINATIONS CANNOT BE READ OUT FROM THE RESPONSES OF THE INDIVIDUAL NEURON ALONE Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: mixed selectivity	`content_tags.definitions[8]`	1.0	the tagger's words
content_tags	3% — Proportion of delay-active lateral prefrontal neurons that fire at a stable rate through the whole delay Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.quantities[0]`		the tagger's words
content_tags	40–100 Hz — Frequency range the review assigns to the gamma band whose power is sustained during working-memory delays Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.quantities[1]`		the tagger's words
content_tags	42 — Number of cortical areas recorded simultaneously in the broadest-coverage monkey study of content-selective delay spiking Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.quantities[2]`		the tagger's words
content_tags	~100,000 — Number of voxels in a 3D fMRI brain image, each pooling tens of thousands of neurons Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.quantities[3]`		the tagger's words
content_tags	10–15 s — Typical fixed delay length used in the most common fMRI boxcar design for estimating delay activity Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.	`content_tags.quantities[4]`		the tagger's words
content_tags	delay activity Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above. also in: delay activity	`content_tags.variables[0]`	1.0	the tagger's words

Interpretive choices

Tags that could not be placed in the text:

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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.