Converging intracortical signatures of two separated processing timescales in human early auditory cortex

Baroni, Morillon, Trébuchon, Liégeois-Chauvel, Olasagasti, Giraud · bioRxiv · 2019 · neuroscience · 10.1101/730002 · record baroni2019-converging-intracortical-signature
tag layer · index · concepts · authors · עברית
Where this record's text came from. faceted 2026-08 by reading the locally held text (pdftext); every evidence string verified as an exact substring of that text before merging. Method is genuinely hybrid and the single-value facet cannot show it: invasive human iEEG, multivariate decoding (regularised least-square classifiers), and a Wilson-Cowan population rate-model simulation. I recorded 'electrophysiology' because the empirical claims rest on the iEEG recordings; 'simulation' would be equally defensible for the second half of the paper. The queue metadata says bioRxiv 2019, but the text below the marker is the published version, NeuroImage 218 (2020) 116882. Several apt sentences straddle page-header artefacts in the extraction ('...across neighboring / it / 12 / F. Baroni et al. / frequency bands...'), so I restricted quotes to sentences lying wholly inside one extracted line - which is why the Podvalny 'rotation of the power spectrum' contrast, an explicit relation to named prior work, is not recorded as a claim_relation. 2026-08-14, 2026-08-15 and 2026-08-25 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.
How to read this page. The article itself is not reproduced here — this paper is not cleared for redistribution, so what follows is the tag layer alone. The evidence sentences are withheld with the article. The table at the foot lists every tag the record carries; each row names the facet it belongs to, and the whose words column says whether the tag records the paper's own wording or the tagger's sentence about the paper. Every tag links to each other paper in the corpus carrying it. The machine-readable edition of the same thing is the TEI file beside this one, where the tags live in standOff, and the article is at its publisher via the link below. When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.
Other fields define these differently the same word, defined another way in another discipline
information content 3 fields · cross-validation 3 fields · area under the ROC curve 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 20 concept tags on this paper, all 20 are grounded in a quoted sentence. 15 carry the tagger's gloss of what the term means in this paper, which is not something the article can license.
Electrode location Significance thresholds interictal epileptiform discharges decoding auditory cortex dual timescale processing infrastructure information content speech detection speech discrimination phase information power information simple rate model negative feedback loop fast subnetwork slow subnetwork auditory perception scale-free process preferred timescales delta-theta gamma Synaptic interactions between excitatory and inhibitory populations operating at theta and gamma timescales, coupled by a negative feedback loop, generate the two-peaked (delta-theta and gamma) spectral profile of information content. Short-term synaptic depression of the bottom-up pathway depletes available neurotransmitter as the speech envelope arrives, producing large onset responses and attenuated responses to later syllables. The beta peak in early auditory cortex is inherited top-down from higher cortical areas rather than generated locally, which is why a single-area microcircuit model cannot reproduce it. Excessive self-excitation drives the network into strong baseline synchronisation and saturating oscillatory responses, so different speech segments elicit near-identical patterns and stimulus information is lost. Regularized Least-Square Classification A prime Phase Locking Value (PLV) prosody area under the ROC curve spectral power bias current strength of recurrent excitatory connections Wilcoxon signed-rank test two-sided Wilcoxon signed-rank test effect size effect size (Cohen’s d) t-test one-tailed t-test false discovery rate correction permutation test permutation-based statistics null distribution by label shuffling cross-validation cross-correlation cross-correlations were averaged across trial pairs z-score standardization inputs were z-transformed median and percentiles electrophysiology

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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
conceptconceptsan idea the paper works with, quoted where the paper uses it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
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
phenomenonphenomenonthe effect or regularity under study
sensesensesa distinct use of a term, quoted where the paper fixes it
transfertransfersa method or concept carried in from another field
unrecordable relationunhoused_relationsa relation the paper asserts that this vocabulary cannot express, with the reason

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/10.1101/730002. The reading view exists for the papers whose licence permits it.

Every tag on this page

claim_relations 4 · claim_type 1 · concept_edges 2 · concepts 20 · content_tags 37 · controls 1 · limitations 8 · mechanisms 4 · method 1 · phenomenon 1 · senses 19 · transfers 2 · unhoused_relations 1

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; 2 of 2 relations here carry that mark. The rest are the tagger’s reading of the sentence quoted beside them.

facettagfieldconf.whose words
claim_typeexistence
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claim_typethe paper's words
phenomenondual-timescale speech processing in human early auditory cortex
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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
mechanismsmechanisms
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mechanisms[3]the tagger's words
limitationsSuccessful decoding does not establish that the decoded activity plays a functional role in speech processing.
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what this limits: any functional claim built on the decoding: WE ACKNOWLEDGE THAT OUR DECODING RESULTS DO NOT UNAMBIGUOUSLY IMPLY A CORRESPONDING FUNCTIONAL ROLE IN SPEECH PROCESSING
limitations[0]the tagger's words
limitationsThe study is correlational; establishing causal contributions would require intervention, which was not done.
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what this limits: any causal reading: CAUSAL CONTRIBUTIONS ARE BEST EXPLORED WITH INTERVENTIONAL APPROACHES, WHICH ARE BEYOND THE SCOPE OF THIS WORK
limitations[1]the tagger's words
limitationsThe model fails to reproduce the baseline beta power peak and its speech-induced reduction.
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what this limits: the model's account of the spectral profile: A KEY FEATURE THAT OUR MODEL DOES NOT REPRODUCE IS THE PRESENCE OF A POWER PEAK IN THE BETA RANGE, WHICH IS REDUCED BY SPEECH STIMULATION
limitations[2]the tagger's words
limitationsThe model does not capture the full inter-trial variability of the iEEG data.
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what this limits: the model's account of trial-to-trial variability: OUR RATE MODEL ... IS NOT EXPECTED TO FULLY CAPTURE THE EXTENT AND COMPLEXITY OF THE INTER-TRIAL VARIABILITY IN THE iEEG DATASET
limitations[3]the tagger's words
limitationsWhere the study can record was decided by clinical need, not by the research question.
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what this limits: the spatial coverage of these recordings as a sample of auditory cortex: Quotation withheld
limitations[4]1.0the tagger's words
limitationsA known contaminant is acknowledged and then set aside by expectation rather than by measurement.
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what this limits: these signals as free of epileptiform contamination: the authors state isolated interictal discharges could have occurred and that their properties are EXPECTED to be unrelated to the variables of interest
limitations[5]1.0the tagger's words
limitationsThe two significance thresholds are not estimated the same way: the stricter one required pooling null values across decoding types.
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file. · what this limits: comparing results reported at p = 0.01 with those at p = 0.001 in this paper: the first threshold was estimated per classification and the second required pooling null values across decoding types
limitations[6]0.85the tagger's words
limitationsThe paper's stricter significance threshold is estimable only by pooling null values across decoding types, so p = 0.001 and p = 0.01 in this paper are not two points on one scale but two differently-constructed tests.
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file.
limitations[7]0.85the tagger's words
transfersThe fast-to-slow negative feedback loop is adopted as a circuit motif because control-theoretic arguments identify it as a building block giving both sensitivity and stability.
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transfers[0]the tagger's words
transfersRegularized Least-Square Classifiers, explicitly described as a machine learning technique, are used to quantify how much stimulus information the neural signal carries.
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transfers[1]the tagger's words
controlsstimuli delivered in a pseudo-randomised order at a fixed comfortable hearing level across both protocols
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eliminates: order effects and adaptation - a fixed sequence would confound stimulus identity with position in the run · outcome (stated by the tagger, no quotation): held
controls[0]0.85the tagger's words
conceptsElectrode location
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concepts[0]the paper's words
conceptsSignificance thresholds
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file.
concepts[1]0.85the paper's words
conceptsinterictal epileptiform discharges
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concepts[2]the paper's words
conceptsdecoding
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file.
also in: decoding
concepts[3]0.85the paper's words
conceptsauditory cortex
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concepts[4]0.95the paper's words
conceptsdual timescale processing infrastructure
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concepts[5]0.95the paper's words
conceptsinformation content
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concepts[6]0.95the paper's words
conceptsspeech detection
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concepts[7]0.95the paper's words
conceptsspeech discrimination
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concepts[8]0.95the paper's words
conceptsphase information
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concepts[9]0.95the paper's words
conceptspower information
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concepts[10]0.95the paper's words
conceptssimple rate model
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concepts[11]0.95the paper's words
conceptsnegative feedback loop
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concepts[12]0.95the paper's words
conceptsfast subnetwork
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concepts[13]0.95the paper's words
conceptsslow subnetwork
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concepts[14]0.95the paper's words
conceptsauditory perception
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concepts[15]0.95the paper's words
conceptsscale-free process
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concepts[16]0.95the paper's words
conceptspreferred timescales
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concepts[17]0.95the paper's words
conceptsdelta-theta
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also in: delta-theta
concepts[18]0.95the paper's words
conceptsgamma
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also in: gamma
concepts[19]0.95the paper's words
unhoused_relationsfast subnetwork → slow subnetwork
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The model couples the fast and slow subnetworks through a negative feedback loop. Coupling-by-feedback is not is-a, part-of, same-as, distinct-from, contrasted-with, operationalised-as, causes, or renamed-across-fields.
unhoused_relations[0]0.95the tagger's words
sensessignificance threshold - AT p = 0.01: estimated separately for each classification considered
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file.
senses[0]0.85the tagger's words
sensessignificance threshold - AT p = 0.001: estimated from null values POOLED across decoding types, because the per-classification estimate was not good enough at that level
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file.
senses[1]0.85the tagger's words
sensesmodel failure - treated as INFORMATIVE rather than as a defect: the features the model does not reproduce are said to highlight the limitations of the approach
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senses[2]1.0the tagger's words
sensesmodel failure - treated as INFORMATIVE rather than as a defect: features the model fails to reproduce are said to highlight the limitations of the modelling approach, so a mismatch is read as a finding about the model
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senses[3]0.95the tagger's words
sensesDual timescale processing infrastructure - convergent auditory-cortex structure supported by spectral analysis and decoding
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senses[4]0.95the tagger's words
sensesInformation content - bimodal spectral decoding at delta-theta and gamma rather than intermediate beta frequencies
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senses[5]0.95the tagger's words
sensesSpeech detection - distinguishing speech from pre-stimulus neural activity
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senses[6]0.95the tagger's words
sensesSpeech discrimination - distinguishing neural patterns for different speech segments
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senses[7]0.95the tagger's words
sensesPhase information - generally decodes better than power information, with detection-only exceptions
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senses[8]0.95the tagger's words
sensesPower information - the comparison baseline that phase generally outperforms
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senses[9]0.95the tagger's words
sensesSimple rate model - two different-timescale excitatory/inhibitory subnetworks connected by negative feedback
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senses[10]0.95the tagger's words
sensesNegative feedback loop - reciprocal fast/slow subnetwork connectivity from Ge to Te and Te to Gi
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senses[11]0.95the tagger's words
sensesFast subnetwork - model subsystem with a natural frequency of 85.9 Hz
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senses[12]0.95the tagger's words
sensesSlow subnetwork - model subsystem with a natural frequency of 3.8 Hz
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senses[13]0.95the tagger's words
sensesAuditory perception - evidence suggests two separated frequency bands rather than scale-free dynamics
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senses[14]0.95the tagger's words
sensesScale-free process - the auditory-processing description rejected by the two-band evidence
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senses[15]0.95the tagger's words
sensesPreferred timescales - ranges where sensory responses dominate and input information is encoded more effectively
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senses[16]0.95the tagger's words
sensesDelta-theta - low-frequency peak of speech information decoding
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senses[17]0.95the tagger's words
sensesGamma - high-frequency peak of speech information decoding
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senses[18]0.95the tagger's words
claim_relationscontradicts → the scale-free account of ECoG/iEEG signals (Miller et al., 2009; He et al., 2010; He, 2014; Podvalny et al., 2015)
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claim_relations[0]the tagger's words
claim_relationsbuilds-on → Lakatos et al., 2005
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claim_relations[1]the tagger's words
claim_relationsextends → Doelling et al. (2019) rate network model
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claim_relations[2]the tagger's words
claim_relationsreplicates → prior reports of phase information outperforming power (Luo and Poeppel, 2007; Howard and Poeppel, 2010; Ng et al., 2013; Gross et al., 2013 and others)
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claim_relations[3]the tagger's words
concept_edgesspeech detection —distinct-from→ speech discrimination
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the relation itself is separately evidenced · strength of the relation: 1 · note: The paper separately defines detection as speech-vs-baseline and discrimination as segment-vs-segment, using a 'not only ... but also' construction.
concept_edges[2]0.95the tagger's words
concept_edgesauditory perception —distinct-from→ scale-free process
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the relation itself is separately evidenced · strength of the relation: 0.9 · note: The paper says multiple pieces of evidence suggest the non-scale-free result, so weight 0.9 preserves that hedge.
concept_edges[3]0.95the tagger's words
content_tagsWilcoxon signed-rank test
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content_tags.statistics[0]the tagger's words
content_tagseffect size
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also in: effect size
content_tags.statistics[1]the tagger's words
content_tagst-test
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also in: t-test
content_tags.statistics[2]the tagger's words
content_tagsfalse discovery rate correction
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content_tags.statistics[3]the tagger's words
content_tagspermutation test
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content_tags.statistics[4]the tagger's words
content_tagsnull distribution by label shuffling
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about this quote: THE MATHS LAYER OF THE STAGED TEXT WAS MOJIBAKE AND HAS BEEN REPAIRED. This paper's extraction rendered '=' as U+00BC (the vulgar fraction one quarter) and '+' as U+00FE (thorn), so the quote read 'p ¼ 0.01' where the paper says 'p = 0.01'. It passed every check we own, because the staged text said the same wrong thing: the offsets were right and the recorded hash of the staged text matched. Repaired only where the character stands in an operator's place - spaced, with a number after it - because the same U+00BC is a REAL QUARTER in six other papers ('a ¼ inch condenser microphone'). Original in evidence as extracted, pre-repair file in an internal file.
content_tags.statistics[5]0.85the tagger's words
content_tagscross-validation
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content_tags.statistics[6]the tagger's words
content_tagscross-correlation
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content_tags.statistics[7]the tagger's words
content_tagsz-score standardization
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content_tags.statistics[8]the tagger's words
content_tagsmedian and percentiles
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content_tags.statistics[9]the tagger's words
content_tagsPre-stimulus spectra often showed a delta shoulder and a beta bump; speech lowered beta power and raised delta-theta and gamma power.
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content_tags.findings[0]the tagger's words
content_tagsSingle-trial decoding of speech was better from phase than from power, and information content was bimodal across frequency — high at delta-theta and at gamma, low at the intervening beta band.
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content_tags.findings[1]the tagger's words
content_tagsPhase's decoding advantage over power grew as the discrimination got harder, from an effect size of 0.79 for easy discrimination to 1.21 for hard discrimination.
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content_tags.findings[2]the tagger's words
content_tagsConcatenating power and phase patterns gave no decoding gain over whichever of the two was already the more informative.
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content_tags.findings[3]the tagger's words
content_tagsPower information for speech detection generalized across low and high frequencies but not to the alpha-beta range.
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content_tags.findings[4]the tagger's words
content_tagsPhase-based decoders trained at one frequency failed when tested at a sufficiently different frequency, showing that speech information sits in frequency-specific phase patterns.
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content_tags.findings[5]the tagger's words
content_tagsUnlike every iEEG subject, the model showed no significant beta power reduction with speech.
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content_tags.findings[6]the tagger's words
content_tagsBoth the model-iEEG and the iEEG-iEEG similarity profiles were bimodal: high at delta-theta and gamma, low at alpha-beta.
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content_tags.findings[7]the tagger's words
content_tagsRecurrent excitatory connection strength in either subnetwork had the largest effect on decoding performance.
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content_tags.findings[8]the tagger's words
content_tagsFor the hardest discrimination, phase gave strongly significant decoding in 9 of 10 patients while power did so in only 4 of 10.
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content_tags.findings[9]the tagger's words
content_tagsRegularized Least-Square Classification
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content_tags.definitions[1]the tagger's words
content_tagsA prime
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also in: A prime
content_tags.definitions[2]the tagger's words
content_tagsPhase Locking Value (PLV)
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content_tags.definitions[3]the tagger's words
content_tagsspeech detection
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content_tags.definitions[4]the tagger's words
content_tagsspeech discrimination
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content_tags.definitions[5]the tagger's words
content_tagsprosody
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also in: prosody
content_tags.variables[0]the tagger's words
content_tagsarea under the ROC curve
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content_tags.variables[1]the tagger's words
content_tagsspectral power
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content_tags.variables[2]the tagger's words
content_tagsbias current
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also in: bias current
content_tags.variables[5]the tagger's words
content_tagsstrength of recurrent excitatory connections
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content_tags.variables[6]the tagger's words
content_tags10 — epilepsy patients from whom intracortical EEG was recorded
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content_tags.quantities[0]the tagger's words
content_tags3.8 Hz and 85.9 Hz — natural resonance frequencies of the slow and fast model subnetworks
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content_tags.quantities[1]the tagger's words
content_tags9/10 vs 4/10 — patients with strongly significant hard-discrimination decoding from phase versus from power
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content_tags.quantities[2]the tagger's words
content_tags7 and 22 Hz / 20 and 40 Hz — inter-individual spread of the two crossover frequencies between speech-induced activation and deactivation bands
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content_tags.quantities[3]the tagger's words
content_tags100 — simulated trials per phrase used for the model decoding analyses
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content_tags.quantities[4]the tagger's words
content_tags0.975 / 0.951 — median phase-decoding accuracy across gamma-subnetwork parameter variations, and its worst value at the most extreme parameters
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content_tags.quantities[5]the tagger's words
content_tags0.79 and 1.21 — Cohen's d for phase's advantage over power in easy and hard discrimination
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content_tags.quantities[6]the tagger's words

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