Generation of Spike Latency Tuning by Thalamocortical Circuits in Auditory Cortex

Zhou, Mesik, Sun, Liang, Xiao, Tao, Zhang · The Journal of Neuroscience · 2012 · neuroscience · 10.1523/jneurosci.1384-12.2012 · record Zhou2012-generation-of-spike-latency-tuning-by-thalam
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Where this record's text came from. faceted 2026-08 by reading the locally held text (html); every evidence string verified as an exact substring of that text before merging. The study combines in vivo whole-cell/loose-patch recording with integrate-and-fire and network simulation; 'electrophysiology' was chosen for method because the recordings carry the central evidence and the models are fed with the recorded conductances, but the simulation component is substantial and the vocabulary cannot express both. 2026-08-13 and 2026-08-15 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
precision 10 fields · model 4 fields · reference 3 fields · spike 2 fields · latency 2 fields · sampling 2 fields · and 2 more →

Tags on this paper

Every tag the record carries, each linking to every other paper in the corpus that carries it. A tag appears here whether or not its words occur in the article — the spans below are only the ones a sentence in this paper licenses. Of the 32 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.
latency spike tuning integration time thalamocortical thalamic intracortical inhibition excitation dynamic range convergence aggregate cortex pyramidal interneuron stellate synaptic strength frequency coding model jitter noise reference silencing QX-314 receptive field feedforward recurrent oscillation precision sampling Differential frequency tuning of the excitatory and inhibitory input strengths creates two opposing effects on integration time (excitation shortens it at the best frequency, inhibition lengthens it away from it), which together stretch the spike latency tuning curve. Because inhibition is more broadly tuned than excitation, the excitation/inhibition ratio falls at the receptive field edges, which further prolongs the already long integration time there. Convergence of many thalamocortical axons with different characteristic frequencies onto one cortical neuron degrades the latency tuning carried by each axon, because the summed input onset is set by the single fastest input. first spike latency (FSL) input latency tone-evoked excitatory and inhibitory synaptic conductances t-test paired t test t test regression best-fit linear regression line coefficient of determination mean and standard deviation spline regression smoothing Bayesian adaptive regression splines mean ± SD electrophysiology

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second readingalternativesan independent re-reading of a facet, recorded whether or not it agrees
relation to other workclaim_relationshow this paper stands to another: agrees, contradicts, extends, qualifies
claim typeclaim_typethe shape of the claim: existence, mechanism, method, critique, prediction, null
concept edgeconcept_edgesan asserted relation between two concepts, with the sentence asserting it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
contributioncontributionwhat the paper claims to add
controlcontrolsan experiment run to eliminate a rival explanation
limitationlimitationswhat the paper says its evidence cannot support
mechanismmechanismshow the reported effect is said to come about
methodmethodhow the paper produced its evidence
object of studyobject_of_studywhat the paper is about — the thing it investigates
phenomenonphenomenonthe effect or regularity under study
research questionresearch_questionthe question the paper sets itself
sensesensesa distinct use of a term, quoted where the paper fixes it
transfertransfersa method or concept carried in from another field

The paper

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Every tag on this page

alternatives 3 · claim_relations 10 · claim_type 1 · concept_edges 9 · content_tags 67 · contribution 1 · controls 1 · limitations 10 · mechanisms 7 · method 1 · object_of_study 1 · phenomenon 1 · research_question 1 · senses 16 · transfers 4

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

facettagfieldconf.whose words
object_of_studyspike latency tuning in layer 4 pyramidal neurons - whether the sharpness of the code is relayed from the thalamus or built locally
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object_of_studythe paper's words
research_questionwhether latency tuning survives the convergence of many thalamic inputs onto one cortical cell, or has to be recreated after that convergence destroys it
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research_questionthe paper's words
contributionthe input latency tuning is nearly flat and the spike latency tuning is three to four times sharper, so the code is generated locally by a push-and-pull of sharply tuned intracortical excitation and broadly tuned inhibition acting on the integration time
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contributionthe paper's words
claim_typemechanism
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claim_typethe paper's words
phenomenonspike latency tuning for sound frequency
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phenomenonthe paper's words
methodelectrophysiology
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methodthe paper's words
mechanismsmechanisms
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mechanisms[0]the tagger's words
mechanismsmechanisms
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mechanisms[1]the tagger's words
mechanismsmechanisms
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mechanisms[2]the tagger's words
mechanismssharply tuned intracortical excitation shortens the integration time most at the optimal frequency, while broadly tuned inhibition prolongs it most at off-optimal frequencies - two antagonistic effects that together triple the dynamic range
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mechanisms[3]1.0the tagger's words
mechanismsand because inhibition is more broadly tuned than excitation, the excitation-to-inhibition ratio is worst at the receptive field periphery, where the integration time is already longest
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mechanisms[4]1.0the tagger's words
mechanismswith the onset of this second component is 2.6 ms after the initial onset of the excitatory response, while the first evoked spike is at 4.2 ms
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mechanisms[5]1.0the tagger's words
mechanismsthe aggregate thalamic input is flat because it is set by the shortest latency among many convergent inputs, so the sharpness carried by each individual afferent is destroyed by the summation
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mechanisms[6]1.0the tagger's words
limitationsQX-314 in the pipette prevented recording real spikes from the same voltage-clamped cells, so spike responses had to be modeled.
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what this limits: any spike-response claim about the recorded cells: DUE TO THE USE OF QX-314 IN THE INTRAPIPETTE SOLUTION TO IMPROVE THE RECORDING QUALITY, WE WERE UNABLE TO EXAMINE THE BONA FIDE SPIKE RESPONSES OF THE SAME NEURON
limitations[0]the tagger's words
limitationsInhibitory responses were not recorded in the cortical-silencing experiments.
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what this limits: the cortical-silencing experiments: TO SIMPLIFY THE EXPERIMENT AND IMPROVE THE SUCCESS RATE, INHIBITORY RESPONSES WERE NOT RECORDED
limitations[1]the tagger's words
limitationsNon-specific effects of the pharmacological silencing mixture cannot be entirely ruled out.
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what this limits: the silencing results: NONSPECIFIC EFFECTS OF THE MIXTURE APPLICATION ... CANNOT BE TOTALLY EXCLUDED
limitations[2]the tagger's words
limitationsThe identity of the early-spiking neurons proposed to supply the fast intracortical excitation is unknown.
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what this limits: the proposed relay population: THE IDENTITIES OF THESE PRESUMPTIVE EXCITATORY RELAY NEURONS ARE ELUSIVE
limitations[3]the tagger's words
limitationsWhether the cortex actually uses the proposed population-onset time reference is not established.
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what this limits: the functional claim: WHETHER THIS STRATEGY IS INDEED IMPLEMENTED BY THE CORTICAL CIRCUITS REMAINS AN OPEN QUESTION
limitations[4]the tagger's words
limitationsthe drug that made the recording possible made the target unmeasurable - QX-314 blocks the spikes of the very cell whose spikes are the output being explained, so they were derived from a model instead
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what this limits: every spike response reported: DUE TO THE USE OF QX-314 ... WE WERE UNABLE TO EXAMINE THE BONA FIDE SPIKE RESPONSES OF THE SAME NEURON - the drug enabling the recording blocks the spikes, so they are derived rather than observed
limitations[5]1.0the tagger's words
limitationsinhibition was not recorded at all in the silencing experiments, and the missing frequency range was replaced by a 55% threshold taken from a different set of recordings
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what this limits: the silencing experiments specifically: TO SIMPLIFY THE EXPERIMENT AND IMPROVE THE SUCCESS RATE, INHIBITORY RESPONSES WERE NOT RECORDED
limitations[6]1.0the tagger's words
limitationsthe cells the mechanism requires have never been recorded from - their identities are called elusive, and the recording methods are stated to be biased against them
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what this limits: the population size the mechanism depends on: THEIR NUMBER COULD BE UNDERESTIMATED SINCE THEY ARE REPORTED TO BE RESISTANT TO GOLGI IMPREGNATION AND DIFFICULT TO SAMPLE WITH INTRACELLULAR RECORDINGS - the absence is a property of the methods
limitations[7]1.0the tagger's words
limitationsnonspecific effects of the silencing mixture cannot be totally excluded, and the argument for specificity is that the changes appear in both the temporal and the frequency domain
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duplicate of: limitations[2] · what this limits: the same scope as limitations[2] - specificity argued rather than demonstrated
limitations[8]1.0the tagger's words
limitationsand whether the brain actually uses a population onset as its time reference remains an open question
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what this limits: the same scope as limitations[4] - whether the brain uses a population onset as its time reference is open
limitations[9]1.0the tagger's words
transfersfirst spike latency as a code for stimulus identity, imported as the property to be explained
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transfers[0]0.8the tagger's words
transfersthe integrate-and-fire neuron fed with measured conductances, used to obtain the spikes the recording method destroyed
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transfers[1]1.0the tagger's words
transfersa four-layer thalamocortical network with background activity, used to ask whether input latency tuning is necessary at all
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transfers[2]1.0the tagger's words
transfersthe requirement for an internal time reference, since the organism has no access to stimulus onset
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transfers[3]0.9the tagger's words
controlsspike latency measured with excitatory input only, and again with both excitatory and inhibitory input present
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eliminates: the contribution of inhibition to latency tuning - the excitation-only condition is the same cell without the thing being tested · outcome (stated by the tagger, no quotation): held
controls[0]0.85the tagger's words
sensesA PROPERTY EVERY ELEMENT HAS, THAT THEIR SUM DOES NOT: individual thalamic neurons are sharply latency-tuned, but the aggregate input to one cortical cell is FLAT, because the sum is set exclusively by the SHORTEST latency among the convergent inputs
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senses[0]1.0the tagger's words
sensesand the network model reproduces exactly that - clear tuning in each thalamic neuron, flat tuning in the aggregate, sharp tuning again in the output
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senses[1]1.0the tagger's words
sensesso the sharpness is NOT INHERITED but reconstructed: the input dynamic range is about 1 ms and the output about 4 ms
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senses[2]1.0the tagger's words
sensesTHE SAME INPUT, THE SAME STRENGTH AT THE OPTIMAL FREQUENCY, AND OPPOSITE EFFECTS ON THE CODE: sharply tuned intracortical excitation INCREASED the dynamic range where cotuned excitation DECREASED it - the tuning width decides, not the amplitude
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senses[3]1.0the tagger's words
sensesPUSH AND PULL: sharply tuned excitation shortens the integration time at the optimal frequency, broadly tuned inhibition prolongs it off-optimum - and an initial tuning of input latency is then NOT ABSOLUTELY REQUIRED
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senses[4]1.0the tagger's words
sensesTHE DRUG THAT MADE THE RECORDING POSSIBLE MADE THE TARGET UNMEASURABLE: QX-314 was used to improve recording quality, and the bona fide spikes of the same neuron could then not be examined - the output had to be DERIVED
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senses[5]1.0the tagger's words
sensesand the derivation is validated the right way - sequential cell-attached and whole-cell recording FROM THE SAME NEURON, with the derived and recorded receptive fields and latency tunings compared directly
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senses[6]1.0the tagger's words
sensesA MISSING MEASUREMENT REPLACED BY A NUMBER FROM ANOTHER EXPERIMENT: inhibition was not recorded in the silencing condition, so the spiking frequency range was set by thresholding the excitatory tuning curve at 55%, a ratio measured elsewhere
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senses[7]1.0the tagger's words
sensesTHE CELL THE MECHANISM REQUIRES IS THE ONE THE METHOD CANNOT SEE: spiny stellate cells are resistant to Golgi impregnation and hard to sample intracellularly, and every current recording method shows SAMPLING BIAS TOWARD LARGE PYRAMIDAL NEURONS
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senses[8]1.0the tagger's words
senseswith the honest consequence stated - the identities of the presumptive excitatory relay neurons are ELUSIVE, and the proposal rests on reasoning rather than on having recorded them
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senses[9]1.0the tagger's words
sensesTHE ZERO POINT OF THE MEASURE BELONGS TO THE EXPERIMENTER, NOT TO THE ORGANISM: the brain has NO ACCESS to the external stimulus onset, so latency is well defined for the observer and undefined for the system being studied
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senses[10]1.0the tagger's words
sensesand the proposed substitutes are all internal - oscillations, local field potentials, population onsets - with whether any is actually used left an open question
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senses[11]1.0the tagger's words
sensesTHREE ALTERNATIVES ELIMINATED BY TIMING ALONE: feedback and recurrent inputs arrive after the first spike, a recurrent component would appear at about 4 ms and was not evident, and the small jitter rules out a random early-firing subgroup
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senses[12]1.0the tagger's words
sensesand gamma oscillations are excluded by arithmetic - a 2 ms delay is difficult to explain by a 30 to 80 Hz rhythm
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senses[13]1.0the tagger's words
sensesTHE TWO CODES NEED DIFFERENT AMOUNTS OF DATA: a smooth latency tuning curve is established in a SINGLE TRIAL, where the spike-rate curve relies on averaging multiple trials
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senses[14]1.0the tagger's words
sensesand the case against the latency code is answered rather than dismissed - noise is thought more destructive to latency than to rate coding, but pooling helps both, and jitter relative to other neurons may be smaller than jitter relative to the stimulus
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senses[15]1.0the tagger's words
alternativesclaim_type: mechanism
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a second reading reaching the same value. Recorded: mechanism — note: a second reading reaching the same value from a different sentence. Not applied - a person decides.
alternatives.claim_typethe tagger's words
alternativesmethod: spikes derived from recorded excitatory and inhibitory conductances with an integrate-and-fire model, validated against cell-attached spikes recorded sequentially from the same neuron
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a second reading DIFFERING from the recorded value. Recorded: electrophysiology — note: a second reading, verbatim-verified, disagreeing with the value on the record. Not applied - a person decides.
alternatives.methodthe tagger's words
alternativesphenomenon: first spike latency tuned for sound frequency - a timing code whose dynamic range is about 1 ms at the input and about 4 ms at the output
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a second reading DIFFERING from the recorded value. Recorded: spike latency tuning for sound frequency — note: a second reading, verbatim-verified, disagreeing with the value on the record. Not applied - a person decides.
alternatives.phenomenonthe tagger's words
claim_relationsbuilds-on → the cortical silencing method of Liu et al. (2007)
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claim_relations[0]the tagger's words
claim_relationsreplicates → Liu et al. (2007), on flattened excitatory frequency tuning after cortical silencing
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claim_relations[1]the tagger's words
claim_relationsreplicates → Wu et al. (2008) and Sun et al. (2010), on inhibition being more broadly tuned than excitation
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differs in: THE AXIS IS RELATIVE TUNING BREADTH, AND IT IS WHAT IS BEING REPLICATED. 'THE TUNING CURVE OF INHIBITORY INPUTS APPEARED BROADER THAN THAT OF EXCITATORY INPUTS TO THE SAME CELL, CONSISTENT WITH PREVIOUS REPORTS.' A 'replicates' usually records that two papers agree; naming the property says WHAT AGREES - and 'to the same cell' is the control that makes the comparison mean anything.
claim_relations[2]the tagger's words
claim_relationsextends → the thalamocortical network model of de la Rocha et al. (2008)
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claim_relations[3]the tagger's words
claim_relationscontradicts → the assumption that spike latency tuning is relayed unchanged along the ascending pathway
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differs in: THE AXIS IS WHERE IN THE CIRCUIT THE LATENCY IS MEASURED. 'the onset latency of their aggregate thalamic input exhibited nearly flat tuning for sound frequency, whereas their spike latency tuning was much sharper.' Relay and local generation are not rival readings of one measurement; they are claims about different stages, and the paper measures both.
claim_relations[4]1.0the tagger's words
claim_relationssupports → the feedforward-inhibition account of cortical response sharpening, extended from spike rate to spike timing
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claim_relations[5]1.0the tagger's words
claim_relationsexplains-away → the apparent need for latency-tuned thalamic input, since the model generates output tuning from flat input tuning
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claim_relations[6]1.0the tagger's words
claim_relationsdistinguishes-from → feedback, recurrent and oscillatory sources of the second excitatory component, each excluded on timing grounds
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differs in: THE AXIS IS ARRIVAL TIME RELATIVE TO THE FIRST SPIKE. 'In principle, Quotation withheld.' Three candidate sources are excluded by a single argument about WHEN they could act - not by measuring them, and not by denying they exist. An elimination that costs no experiment and holds only for the quantity being explained, which is first-spike latency.
claim_relations[7]1.0the tagger's words
claim_relationscritiques → the objection that noise destroys latency codes more than rate codes, on the grounds that pooling helps both and the relevant reference is other neurons
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differs in: THE AXIS IS WHAT EACH CODE IS ASSUMED TO BE READ BY. 'Quotation withheld together, while with latency codes, single spikes ar[e considered].' The comparison is unfair by construction: one code is given a population and the other a single spike, so the noise result follows from the assumption rather than from the codes.
claim_relations[8]1.0the tagger's words
claim_relationspredicts → that spiny stellate neurons, if they can be recorded in vivo, will be the postulated fast excitatory relay
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claim_relations[9]0.9the tagger's words
concept_edgesinhibition —causes→ integration time
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strength of the relation: 1 · note: broadly tuned inhibition PROLONGS the integration time preferentially at off-optimal frequencies
concept_edges[3]1.0the tagger's words
concept_edgesexcitation —causes→ integration time
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strength of the relation: 1 · note: sharply tuned intracortical excitation SHORTENS it selectively at the optimal frequency Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span credits broadly tuned INHIBITION with prolonging integration time; excitation's role is not stated here.
concept_edges[4]1.0the tagger's words
concept_edgesintegration time —causes→ dynamic range
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status: the paper's own words: likely · strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the push-pull mechanisms expand the dynamic range; integration time as the cause is loose.
concept_edges[6]1.0the tagger's words
concept_edgesinhibition —contrasted-with→ excitation
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strength of the relation: 1
concept_edges[18]1.0the tagger's words
concept_edgesinhibition —causes→ receptive field
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strength of the relation: 1 · note: broader inhibitory tuning imposes larger E/I ratios at receptive field PERIPHERIES, where the integration time is already long Audit 2026-09-28: DOUBTFUL - read against its span and kept, but broader inhibitory tuning sharpens spike tuning; causes 'receptive field' is loose.
concept_edges[20]1.0the tagger's words
concept_edgesrecurrent —distinct-from→ feedforward
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strength of the relation: 1 · note: THREE ALTERNATIVES ELIMINATED BY TIMING: feedback and recurrent inputs arrive after the first spike, a recurrent component would show at about 4 ms and WAS NOT EVIDENT, and the small jitter rules out a random early-firing subgroup Audit 2026-09-28: DOUBTFUL - read against its span and kept, but feedforward, feedback and recurrent are listed as alternative sources; distinct-from is loose.
concept_edges[40]1.0the tagger's words
concept_edgestuning —contrasted-with→ spike
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differs in: THE AXIS IS HOW MANY TRIALS THE TUNING NEEDS TO EXIST. 'Quotation withheld.' A code available on one trial and a code that exists only in the average are different claims about what a downstream neuron could use - and the averaging that makes the second visible is the analyst's, not the brain's. Same paper whose aggregation operator is already in this corpus for deciding the meaning of a sum. · strength of the relation: 1 · note: THE TWO CODES NEED DIFFERENT AMOUNTS OF DATA: the latency curve is established in a SINGLE TRIAL, the spike-rate curve relies on averaging Audit 2026-09-28: DOUBTFUL - read against its span and kept, but latency tuning emerges on a single trial while rate tuning needs averaging; contrasted-with is loose.
also in: tuning · spike
concept_edges[44]1.0the tagger's words
concept_edgesprecision —part-of→ coding
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strength of the relation: 1 · note: two prerequisites stated - precise spike timing per presentation, and a broad dynamic range; submillisecond precision with a 4 ms range is judged sufficient Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but precise spike timing is one of 'two prerequisites' for latency coding; part-of is loose.
also in: precision · coding
concept_edges[45]1.0the tagger's words
concept_edgesdynamic range —part-of→ coding
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strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but a broad dynamic range is one of 'two prerequisites' for latency coding; part-of is loose.
also in: dynamic range · coding
concept_edges[46]1.0the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[0]the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[1]the tagger's words
content_tagsregression
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also in: regression
content_tags.statistics[2]the tagger's words
content_tagscoefficient of determination
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content_tags.statistics[3]the tagger's words
content_tagsmean and standard deviation
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content_tags.statistics[4]the tagger's words
content_tagsspline regression smoothing
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content_tags.statistics[5]the tagger's words
content_tagspaired t test
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also in: paired t test
content_tags.statistics[6]0.8the tagger's words
content_tagsmean ± SD
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also in: mean ± SD
content_tags.statistics[7]1.0the tagger's words
content_tagsThe onset latency of the aggregate thalamic input to layer 4 neurons is almost untuned for sound frequency, while the same cells' spike latency is sharply tuned with a much wider dynamic range.
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content_tags.findings[0]the tagger's words
content_tagsBroadly tuned intracortical inhibition lengthens the integration time for spike generation at off-optimal frequencies, whereas sharply tuned intracortical excitation shortens it at the optimal frequency.
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content_tags.findings[1]the tagger's words
content_tagsThe dynamic range of spike latency is three times that of synaptic input latency.
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content_tags.findings[2]the tagger's words
content_tagsoutputs of individual thalamic neurons exhibited a clear latency tuning, and the aggregate input to each pyramidal neuron had a flat latency tuning
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content_tags.findings[3]the tagger's words
content_tagsCortical pyramidal neurons produced sharp spike latency tuning even when their input latency tuning was flat.
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content_tags.findings[4]the tagger's words
content_tagsthe onset of this second component is 2.6 ms after the initial onset of the excitatory response, while that of the first evoked spike is 4.2 ms
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content_tags.findings[5]the tagger's words
content_tagsFirst spike latency was tuned much like spike rate, with a similar preferred frequency.
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content_tags.findings[6]the tagger's words
content_tagsAdding inhibition to the derived responses lengthened spike latency mostly at the tuning-curve tails, widening the dynamic range and sharpening latency tuning.
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content_tags.findings[7]the tagger's words
content_tagsthe input latency tuning is nearly flat and the spike latency tuning much sharper, so the code is NOT simply inherited from the thalamus
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content_tags.findings[8]1.0the tagger's words
content_tagsbroadly tuned intracortical inhibition prolongs the integration time at off-optimal frequencies while sharply tuned intracortical excitation shortens it at the optimal frequency
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content_tags.findings[9]1.0the tagger's words
content_tagswith the stated strategy being the conversion of information spatially coded in synaptic strength into a temporal representation
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content_tags.findings[10]1.0the tagger's words
content_tagsTHE SUM LOSES WHAT EVERY ELEMENT HAS: the summed input latency is determined exclusively by the SHORTEST latency among many convergent inputs, so a sharp output tuning has to be recreated from a flat input tuning
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content_tags.findings[11]1.0the tagger's words
content_tagsand the network model reproduces it - clear latency tuning in each thalamic neuron, flat tuning in the aggregate, sharp tuning in the output anyway
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content_tags.findings[12]1.0the tagger's words
content_tagsthe dynamic range is about 1 ms for the input and about 4 ms for the spike output
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content_tags.findings[13]1.0the tagger's words
content_tagsmeasured stepwise: 1.5 ms of input latency, 2.0 ms from thalamocortical input alone, 3.1 ms once intracortical excitation is included
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content_tags.findings[14]1.0the tagger's words
content_tagsthe onset of this second component is 2.6 ms after the initial onset of the excitatory response, while the first evoked spike is at 4.2 ms
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content_tags.findings[15]1.0the tagger's words
content_tagsPUSH AND PULL, with the consequence that an initial tuning of input latency is NOT ABSOLUTELY REQUIRED for the creation of spike latency tuning
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content_tags.findings[16]1.0the tagger's words
content_tagsinhibition is more broadly tuned than excitation, so the E/I ratio is worst at receptive field peripheries where the integration time is already longest
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content_tags.findings[17]1.0the tagger's words
content_tagscotuned and sharply tuned intracortical excitation shortened integration time equally at the optimal frequency, but the sharply tuned kind increased the dynamic range of spike latency while the cotuned kind decreased it
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content_tags.findings[18]1.0the tagger's words
content_tagsthe derived spikes were validated against cell-attached spikes recorded sequentially FROM THE SAME NEURON, on receptive field, best frequency and dynamic range
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content_tags.findings[19]1.0the tagger's words
content_tagsTHE DRUG THAT IMPROVED THE RECORDING REMOVED THE OBSERVATION: with QX-314 in the pipette the bona fide spikes of the same neuron could not be examined, so they were derived from a model
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content_tags.findings[20]1.0the tagger's words
content_tagsA MISSING MEASUREMENT REPLACED BY A NUMBER FROM ANOTHER EXPERIMENT: inhibition was not recorded in the silencing condition and the spiking frequency range was set by thresholding at 55%
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content_tags.findings[21]1.0the tagger's words
content_tagsspiny stellate cells, the candidate relay, resist Golgi impregnation and are hard to sample intracellularly, and current patch-recording methods are biased toward large pyramidal neurons
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content_tags.findings[22]1.0the tagger's words
content_tagswith the identities of the presumptive excitatory relay neurons called ELUSIVE and the proposal resting on reasoning rather than on recordings
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content_tags.findings[23]1.0the tagger's words
content_tagsTHE ZERO POINT OF THE MEASURE BELONGS TO THE EXPERIMENTER: the brain has no access to the external stimulus onset, so an internally generated time reference is necessary
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content_tags.findings[24]1.0the tagger's words
content_tagsthree candidate internal references are named - oscillations, local field potentials, population onsets - and whether any is used is left an open question
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content_tags.findings[25]1.0the tagger's words
content_tagsTHREE ALTERNATIVES ELIMINATED BY TIMING ALONE: feedback and recurrent inputs arrive too late, the expected recurrent component was not evident, and the small jitter excludes a random early-firing subgroup
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content_tags.findings[26]1.0the tagger's words
content_tagsand gamma oscillations are excluded by arithmetic - a 2 ms delay is difficult to explain by a 30 to 80 Hz rhythm
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content_tags.findings[27]1.0the tagger's words
content_tagsnonspecific effects of the silencing mixture cannot be totally excluded, and the specificity argument is that the changes appear in both the temporal and the frequency domain
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content_tags.findings[28]1.0the tagger's words
content_tagsTHE TWO CODES NEED DIFFERENT AMOUNTS OF DATA: the latency tuning curve is established in a single trial, the spike-rate curve relies on averaging multiple trials
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content_tags.findings[29]1.0the tagger's words
content_tagstwo prerequisites for a latency code are stated - precise spike timing per presentation and a broad dynamic range - and submillisecond precision with a 4 ms range is judged sufficient
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WHOSE RESULT THIS IS: Previous studies have demonstrated - THE SUBJECT OF THIS RESULT IS AN INDEFINITE STUDY, NOT THIS PAPER. 'Previous studies reported', 'studies in guinea pig showed', 'recent studies have reported' - somebody else's work under a common noun rather than a name, with a citation in the sentence and no first-person marker. The quote is verbatim and the claim is true; only the attribution is wrong. FOUND BY MEASURING MY OWN CUE'S RECALL: the first sweep required a NAMED author as the subject ('Sperling (1960) demonstrated') and found 17. Reading eleven citation-bearing findings on 'Plakke2016' by hand showed four the cue could not see - 'A study examining recognition found', 'studies of typical human subjects have demonstrated', 'A follow up study found' - so the named cue's 17 was a floor and not a count. A CUE'S FALSE POSITIVES TELL YOU NOTHING ABOUT ITS FALSE NEGATIVES, and the only way to find these was to read a record's whole layer.
content_tags.findings[30]1.0the tagger's words
content_tagsthe standing objection that noise hurts latency codes more than rate codes is answered: pooling helps both, and jitter relative to other neurons may be lower than relative to the stimulus
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content_tags.findings[31]1.0the tagger's words
content_tagswith 20 Hz background activity the latency tuning is largely preserved, but the jitter increases especially at off-optimal frequencies
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content_tags.findings[32]1.0the tagger's words
content_tagsfirst spike latency (FSL)
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content_tags.definitions[1]the tagger's words
content_tagsinput latency
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also in: input latency
content_tags.definitions[2]the tagger's words
content_tagsintegration time
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content_tags.definitions[3]the tagger's words
content_tagsintegration time
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content_tags.definitions[5]0.9the tagger's words
content_tagsdynamic range
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also in: dynamic range
content_tags.definitions[6]0.9the tagger's words
content_tagsreference
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also in: reference
content_tags.definitions[7]1.0the tagger's words
content_tagsfeedforward
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also in: feedforward
content_tags.definitions[8]0.9the tagger's words
content_tagstone-evoked excitatory and inhibitory synaptic conductances
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content_tags.variables[3]the tagger's words
content_tagsintegration time
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content_tags.variables[5]1.0the tagger's words
content_tagsdynamic range
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also in: dynamic range
content_tags.variables[6]1.0the tagger's words
content_tagsjitter
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also in: jitter
content_tags.variables[7]1.0the tagger's words
content_tagsfrequency
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also in: frequency
content_tags.variables[8]1.0the tagger's words
content_tagsa factor of three — how much broader the spike-latency dynamic range is than the input-latency dynamic range
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content_tags.quantities[0]the tagger's words
content_tags1.5 ± 0.5 ms — dynamic range of the isolated thalamocortical input latency across frequency
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content_tags.quantities[1]the tagger's words
content_tags3.1 ± 0.8 ms — dynamic range of derived spike latency once intracortical excitation was included
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content_tags.quantities[2]the tagger's words
content_tags14.34 ± 0.42 ms — average first spike latency in the intracellularly recorded layer 4 neurons
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content_tags.quantities[3]the tagger's words
content_tags2.6 ± 0.7 ms — delay of the second (intracortical) excitatory component after the onset of excitation
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content_tags.quantities[4]the tagger's words
content_tags4.2 ± 0.3 ms — delay of the first evoked spike after the onset of excitation
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content_tags.quantities[5]the tagger's words
content_tags93 — number of middle-layer neurons whose first spike latencies were sampled with cell-attached recording
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content_tags.quantities[6]the tagger's words
content_tags∼55% — fraction of the excitatory response range over which the cell actually spikes, used to threshold the tuning curve
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content_tags.quantities[7]the tagger's words
content_tags800 — number of model cells in each of the four layers of the thalamocortical network model
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content_tags.quantities[8]the tagger's words
content_tags∼1 ms ... ∼4 ms — the dynamic range of latency tuning within the frequency range for spiking response - for the input, and increased for the spike output
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content_tags.quantities[9]1.0the tagger's words
content_tags1.5 ± 0.5 ms ... 2.0 ± 0.8 ms ... 3.1 ± 0.8 ms — the same range measured stepwise as each input component is added back, so the mechanism is attributed by subtraction rather than asserted
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content_tags.quantities[10]1.0the tagger's words
content_tags2.6 ± 0.7 ms ... 4.2 ± 0.3 ms — the intracortical component arrives before the first spike, which is the entire license for saying it can modulate spike timing
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content_tags.quantities[11]1.0the tagger's words
content_tags55% — a ratio measured in current-clamp recordings and used as a threshold in a different experiment where inhibition was never recorded
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content_tags.quantities[12]1.0the tagger's words
content_tags20 Hz — background firing set deliberately ABOVE the typical level, so preserved tuning is a conservative result
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content_tags.quantities[13]1.0the tagger's words

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