Local category-specific gamma band responses in the visual cortex do not reflect conscious perception — TEI-tagged view

Aru, Axmacher, Do Lam, Fell, Elger, Singer, Melloni · 2012 · neuroscience · doi:10.1523/jneurosci.2051-12.2012 · full text at the source · TEI xml · tagged edition · index · concepts · authors
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. Claim type is 'null-result': the decisive datum is the absence of any previous-exposure effect on gamma band responses despite a matched behavioural effect (a post hoc power analysis is reported to show the null is not a detection failure). The paper is simultaneously a critique of the local-NCC position ('This result contradicts the proposal that local gamma band responses in the higher-order visual cortex reflect conscious perception.'), so 'critique' would be a defensible second tag. Replication status is 'contested' because the paper both reproduces Fisch et al.'s contrastive effect and reaches the opposite conclusion about its interpretation - the two relations are recorded separately (replicates the contrast, contradicts the conclusion). Note the quoted method sentence is the paradigm description; six epilepsy patients (62 artefact-free electrodes) plus 24 healthy controls and an 8-subject rating-scale control provided the behavioural replication. 2026-08-12 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.
Other fields define these differently the same word, defined another way in another discipline
false discovery rate 6 fields · standard deviation 3 fields · neural correlates of consciousness 2 fields · anesthesia 2 fields · statistical power 2 fields · SEM 2 fields · and 1 more →
Tags on this paper every tag the record carries, whether or not the words occur in the text below — a number is how many papers in the corpus carry that tag; a tag with no number is unique to this paper
neural correlates of consciousness5 conscious perception5 gamma band responses hGBR lGBR sensory evidence previous exposure prior knowledge2 contrastive method prerequisites long-range integration category-specific person-selective repetition suppression9 catch images degradation4 subjective task objective task visual cortex9 fusiform gyrus lateral occipital cortex intracranial EEG anesthesia14 electrophysiology110

Our tag layer for this paper

Cross-disciplinary analysis
content-tags & facets: phenomenon · claim-type · cross-domain-transfer · mechanism · claim-relation · replication-status · limitation — grounded in the full text
phenomenonneural correlates of conscious visual perception— “One central controversy in consciousness research is whether conscious perception arises locally from activity in sensory cortices ( Zeki, 2001 ; Malach, 2007 ) or whether it requires integration across brain areas ( Tononi and Koch, 2008 ; Melloni and Singer, 2010 ; Dehaene and Changeux, 2011 ).”
claim-typenull-result— “In contrast, we observed that although subjective reports were modulated both by sensory evidence and by previous exposure, gamma band responses solely reflected sensory evidence.”
method — evidence— “Here we directly address this issue by developing a new experimental paradigm in which conscious perception is modulated either by sensory evidence or by previous exposure of the images while recording intracranial EEG from the higher-order visual cortex of human epilepsy patients.”
object of study — evidence— “Here we directly address this issue by developing a new experimental paradigm in which conscious perception is modulated either by sensory evidence or by previous exposure of the images while recording intracranial EEG from the higher-order visual cortex of human epilepsy patients.”
research question — evidence— “A clear prediction is that neural processes directly reflecting conscious perception should be present regardless of how it comes about.”
contribution — evidence— “In contrast, we observed that although subjective reports were modulated both by sensory evidence and by previous exposure, gamma band responses solely reflected sensory evidence.”
transferfrom signal processing / wavelet analysis: Morlet wavelet convolution at roughly six cycles, used to resolve gamma power in time without committing to fixed epochs— “For each trial, bipolar derivations were analyzed in the time–frequency domain by convolution with complex Gaussian Morlet wavelets with a bandwidth parameter f 0 /σ f = 6, i.e., wavelets of approximately six cycles length.”transfers[0]
transferfrom computational statistics: Monte Carlo resampling used not to test the hypothesis but to establish that the reported null had the power to have found an effect— “Post hoc power analysis was done with Monte Carlo simulations.”transfers[1]
transferfrom multiple-comparison methodology: false discovery rate control applied across the full electrode-by-time grid, which is what lets the per-electrode table be read as a whole— “Results were corrected for multiple comparisons using false discovery rate across all time windows and electrodes.”transfers[2]
mechanismCategory-specific gamma indexes local sensory processing that is a necessary precondition for conscious perception rather than its direct correlate— “Thus, an alternative explanation for the findings of Fisch et al. (2009) is that category-specific GBRs in sensory cortices reflect local processing, which is a necessary prerequisite for but not the direct correlate of conscious perception.”mechanisms[0]
mechanismStronger local preprocessing raises the probability that a stimulus reaches awareness, which manufactures a correlation between gamma and 'seen' reports without gamma causing awareness— “In other words, in a paradigm such as used by Fisch et al. (2009) , it cannot be ruled out that the enhanced GBR just reflected more effective preprocessing of stimuli that enhanced the chances of these stimuli to get perceived consciously.”mechanisms[1]
mechanismDifferences in unconscious local processing propagate into different conscious outcomes, so local responses can correlate with awareness while being prerequisites of it— “In typical experimental paradigms, differences in local unconscious processing might lead to different outcomes regarding conscious perception, and therefore, specific local responses can correlate with conscious perception without necessarily being direct correlates of conscious experience.”mechanisms[2]
mechanismthe criterion is invariance, not correlation: a correlate of consciousness must move whenever consciousness moves, whatever moved it— “A clear prediction is that neural processes directly reflecting conscious perception should be present regardless of how it comes about.”mechanisms[3]
mechanismthe disconfirmation rests on that invariance failing, which is why a single dissociation is enough to reject the proposal— “It is this lack of invariance of the local GBR that makes it unlikely that GBR reflect a mechanism directly responsible for conscious perception.”mechanisms[4]
mechanismtwo routes to the same behavioural endpoint are engineered — one that runs through local processing and one that does not — so the neural measure can be asked to choose— “we manipulated conscious perception in two different ways: either by changing the amount of sensory evidence, which directly modulates local…mechanisms[5]
mechanismthe equivalence of the two routes is established behaviourally first, across three separate samples, because the whole argument collapses if one manipulation is simply strongermechanisms[6]
mechanismthe null is defended by Monte Carlo power simulation rather than asserted, showing the test would have caught a 30% shift
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mechanisms[7]
mechanismthe electrode selection contrast is chosen so that neither experimental factor can contaminate it — same degradation, neither group previously seen
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mechanisms[8]
mechanismthe disputed study's own frequency band is analysed unchanged so the comparison is direct, and only then extended
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mechanisms[9]
mechanismcatch trials containing only background give an independent check that the subjective report is trustworthy before it is used as the criterion
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mechanisms[10]
mechanismthe rival explanation for the null — repetition suppression cancelling an enhancement — is closed with a boundary condition from the literature: repetition of degraded images enhances rather than suppresses
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mechanisms[11]
mechanismimages are rotated through every condition across patients so no result can be an artefact of particular pictures
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mechanisms[12]
mechanismthe within-subject reply to 'sensory evidence is just stronger' is that even patients for whom exposure mattered more behaviourally showed only the sensory effect neurally
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mechanisms[13]
contradicts Fisch et al. (2009), the finding that local category-specific gamma band responses in visual cortex mark conscious perception
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claim_relations[0]
builds-on Fisch et al. (2009) - electrode-selection procedure and analysed frequency range adopted for direct comparability
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claim_relations[1]
replicates Fisch et al. (2009) - the contrastive seen-versus-unseen gamma band enhancement
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claim_relations[2]
builds-on Aru et al. (2012) and de Graaf et al. (2012), the argument that standard NCC methods confound prerequisites and consequences of consciousness
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claim_relations[3]
contradicts Fisch et al. (2009), that category-specific gamma in visual cortex correlates with and marks conscious perception
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claim_relations[4]
critiques the contrastive method as used throughout consciousness research
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claim_relations[5]
supports theories grounding consciousness in long-range integration rather than local processing depth
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claim_relations[6]
builds-on Gray and Singer (1989), that stimulus-specific gamma persists under anesthesia
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claim_relations[7]
critiques neuroimaging evidence for local accounts, as too slow to see the dynamics at issue
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claim_relations[8]
extends the authors' own theoretical critique of NCC methodology (Aru et al., 2012), by turning it into an experiment
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claim_relations[9]
senseneural correlate — as anything that covaries with report, versus as the process uniquely and directly associated with the experience; the paper's whole case turns on the second
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senses[0]
sensegamma band response — low (30–70 Hz) versus high (70–150 Hz); the paper argues they are one broadband process seen more strongly at high frequencies
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senses[1]
senseconscious perception — as the subjective report of seeing versus as the objective gender discrimination; both are collected and the analysis rests on the first
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senses[2]
senseenhancing perception — by adding stimulus information versus by adding prior knowledge; behaviourally equivalent here, neurally not
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senses[3]
senseconsciousness arising locally in sensory cortices versus requiring integration across areas — the controversy the paper is intervening in
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senses[4]
sensean effect that is corrected across electrodes and times versus one that is uncorrected; Table 1 reports both and the argument uses them differently
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senses[5]
controlthe pictures containing a person were PSEUDORANDOMISED across four patients, so that each picture was assigned to every condition exactly once — held — rules out picture-specific effects - any gamma-band response peculiar to one image is spread across all conditions instead of loading onto one, so it cannot be read as category selectivity
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controls[0]
auditgamma band responses —distinct-from→ neural correlates of consciousness — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes that gamma responses do not 'reflect conscious perception', not 'neural correlates of consciousness'; distinct-from is loose.
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concept_edges[0]
weightgamma band responses —distinct-from→ neural correlates of consciousness — 0.95
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concept_edges[0]
auditgamma band responses —is-a→ prerequisites — Audit 2026-09-28: DOUBTFUL - read against its span and kept, but the span calls local processing a necessary prerequisite for conscious perception; is-a 'prerequisites' is loose.
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concept_edges[1]
weightgamma band responses —is-a→ prerequisites — 0.8
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concept_edges[1]
auditsensory evidence —contrasted-with→ previous exposure — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but sensory evidence and previous exposure are the TWO FACTORS that controlled visibility; contrasted-with is loose.
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concept_edges[2]
retractedEVIDENCE CORRECTED (RE-GROUNDED) · sensory evidence —causes→ gamma band responses — RE-GROUNDED. The old span said hGBR rather than the endpoint's own name. This sentence names both and states the dependence in its careful form - gamma band responses 'SOLELY reflected sensory evidence', while subjective reports were modulated by two things.
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concept_edges[3]
weightEVIDENCE CORRECTED (RE-GROUNDED) · sensory evidence —causes→ gamma band responses — 0.95
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concept_edges[3]
auditEVIDENCE CORRECTED (RE-GROUNDED FROM A NEITHER-ENDPOINT SPAN) · previous exposure —causes→ conscious perception — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes 'reported to perceive', not 'conscious perception'.
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concept_edges[4]
retractedEVIDENCE CORRECTED (RE-GROUNDED FROM A NEITHER-ENDPOINT SPAN) · previous exposure —causes→ conscious perception — RE-GROUNDED FROM A NEITHER-ENDPOINT SPAN. The old span named neither term - it described what subjects reported. This sentence names both and states the DESIGN: 'a new experimental paradigm in which CONSCIOUS PERCEPTION…'. The causal claim is the manipulation, not an observed association.
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concept_edges[4]
weightEVIDENCE CORRECTED (RE-GROUNDED FROM A NEITHER-ENDPOINT SPAN) · previous exposure —causes→ conscious perception — 0.95
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concept_edges[4]
edgesensory evidence —operationalised-as→ degradation
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concept_edges[6]
retractedEVIDENCE CORRECTED (RE-GROUNDED) · conscious perception —operationalised-as→ subjective task — RE-GROUNDED. The old span described the subjective task without naming conscious perception. This sentence names both and says WHY the task stands for the concept: it addresses the neural profile correlating with subjective reports about conscious perception.
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concept_edges[7]
auditlong-range integration —same-as→ neural correlates of consciousness — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but theories PROPOSE that conscious experience is grounded in long-range integration; same-as is loose and attributed.
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concept_edges[8]
weightlong-range integration —same-as→ neural correlates of consciousness — 0.6
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concept_edges[8]
auditRETRACTED ('part of the same X' IS 'part-of', AND THE SCHEMA HAS THAT TYPE) · hGBR —same-as→ lGBR — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span says the result is 'SUGGESTING' lGBR and hGBR are part of the same broadband process; same-as is hedged.
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concept_edges[9]
retractedRETRACTED ('part of the same X' IS 'part-of', AND THE SCHEMA HAS THAT TYPE) · hGBR —same-as→ lGBR — 'part of the same X' IS 'part-of', AND THE SCHEMA HAS THAT TYPE. The edge is 'hGBR --same-as--> lGBR'. The span: '…that lGBR and hGBR are part of the same broadband process…' Two things being parts of one process does not make them each other - and the relation the sentence states is available in the vocabulary, as two 'part-of' edges to the broadband process, which would also preserve the third term the identity edge deletes. THE AUTHOR DECLINES THE IDENTITY IN THE SAME BREATH, and the tag is stronger than the sentence it quotes. 'Suggesting' is the authors reporting what a figure is consistent with, not what they have shown.
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Quotation withheld — this paper is not ours to reproduce, and the page has already quoted as much of it as the rights layer allows. The tag, its field and its confidence stand; the sentence is at the publisher.
concept_edges[9]
weightRETRACTED ('part of the same X' IS 'part-of', AND THE SCHEMA HAS THAT TYPE) · hGBR —same-as→ lGBR — 0.8
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concept_edges[9]
auditperson-selective —operationalised-as→ catch images — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but person-selectivity was judged by COMPARISON WITH catch images; operationalised-as is loose.
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concept_edges[10]
weightperson-selective —operationalised-as→ catch images — 0.95
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concept_edges[10]
auditgamma band responses —distinct-from→ conscious perception — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but local gamma increases 'MIGHT thus reflect' unconscious processing; distinct-from is hedged.
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concept_edges[11]
weightgamma band responses —distinct-from→ conscious perception — 0.9
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concept_edges[11]
noteprevious exposure —causes→ conscious perception — RE-GROUNDS another row of this record: the old span named NEITHER endpoint.
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concept_edges[15]
weightprevious exposure —causes→ conscious perception — 0.95
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concept_edges[15]
outcome (stated by the tagger, no quotation)control — heldcontrols[0]
duplicate oflimitation — limitations[1]
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limitations[3]
replicationcontested
limitationElectrode coverage did not permit testing the alternative account, that long-range integration rather than local gamma tracks conscious perception.
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limitations[0]
limitationWhether the two manipulations affect interareal integration in the same way is left open.
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limitations[1]
limitationthe alternative the paper favours — long-range integration — could not be tested with the electrodes available
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limitations[2]
limitationwhether the two manipulations affect interareal integration equally is unknown, so the positive account is untested
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limitations[3]
limitationonly one electrode showed a low-gamma effect surviving correction, so the low-band comparison with the disputed study rests on uncorrected effects
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limitations[4]
limitationthe frequency comparison with the disputed study is partly inference, since that study did not analyse above 70 Hz
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limitations[5]
limitationfull randomisation held for only four of the six patients
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limitations[6]
limitationthe integration account is left standing rather than supported, pending paradigms of this kind applied to it
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limitations[7]
Content tags
content-observations: finding · quantity · variable · definition · key-term — grounded in the full text
findingBoth experimental routes to conscious perception worked: reducing image degradation and having previously seen the image each raised the rate of 'seen' reports.
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content_tags.findings[0]
findingThe two manipulations boosted subjective visibility to a statistically indistinguishable degree and did not interact.
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content_tags.findings[1]
findingIn the larger sample of healthy controls, previous exposure and sensory evidence each significantly affected subjective perception.
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content_tags.findings[2]
findingCategory-specific gamma responses were larger on trials where the person was reported seen, replicating the earlier result the study set out to test.
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content_tags.findings[3]
findingHigh-gamma responses were modulated by sensory evidence on 6 of 7 person-specific electrodes, and none of them by previous exposure.
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content_tags.findings[4]
findingA post hoc power analysis showed the null effect of previous exposure was not a detection failure.
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content_tags.findings[5]
findingLow and high gamma effects formed one continuous broadband response starting near 50 Hz rather than two distinct phenomena.
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content_tags.findings[6]
findingBecause local gamma does not track conscious perception invariantly across the two routes to it, it cannot be the mechanism directly responsible for conscious perception.
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content_tags.findings[7]
findingboth lower degradation and prior exposure raised the proportion of trials where a person was reported seen
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content_tags.findings[8]
findingthe two manipulations boosted subjective perception to a statistically indistinguishable degree, with no interaction
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content_tags.findings[9]
findingin 24 healthy controls both previous exposure and sensory evidence significantly affected subjective perception
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content_tags.findings[10]
findingand again in eight subjects using an 11-point perceptual rating scale rather than a yes/no report
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content_tags.findings[11]
findinggamma tracked sensory evidence on 6 of 7 person-specific electrodes and prior exposure on none
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content_tags.findings[12]
findingthe population analysis agreed: sensory evidence significant from 100 to 450 ms, previous exposure at p > 0.2 in every window
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content_tags.findings[13]
findingthe null was not a power failure — the test had 0.94 power to detect a 30% change uncorrected, 0.9 corrected
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content_tags.findings[14]
findingthe paper did replicate the original positive result: gamma was higher on trials where the person was consciously perceived, on 5 of 7 electrodes
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content_tags.findings[15]
findingperson-specific gamma appeared on 7 electrodes across 5 patients, all on lateral occipital cortex and fusiform gyrus
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content_tags.findings[16]
findingthe person-vs-background difference ran from about 50 Hz upward, indicating one broadband process rather than two bands
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content_tags.findings[17]
findingfalse alarms on background-only catch trials averaged 1.5 of 44, so the visibility reports were reliable
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content_tags.findings[18]
quantity6 — epilepsy patients with intracranial electrodes who performed the main experiment
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content_tags.quantities[0]
quantity62 — electrodes free of epileptic activity that entered the analysis
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content_tags.quantities[1]
quantityseven — electrodes showing person-specific high gamma enhancement, in five patients
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content_tags.quantities[2]
quantity85% (6/7) — person-specific electrodes whose high gamma tracked sensory evidence, versus none for previous exposure
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content_tags.quantities[3]
quantity70% (5/7) — person-specific electrodes showing sustained gamma on consciously perceived trials
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content_tags.quantities[4]
quantity0.94 and 0.9 — statistical power to detect a 30% change, uncorrected and corrected
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content_tags.quantities[5]
quantity24 — healthy control subjects in the psychophysical replication
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content_tags.quantities[6]
quantity60% to 90% in 5% steps — range of image noise levels used to titrate visibility
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content_tags.quantities[7]
quantityForty-four — trials acquired per experimental condition in the patient experiment
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content_tags.quantities[8]
quantitysix patients — intracranial sample
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content_tags.quantities[9]
quantity24 healthy human subjects — psychophysical control sample
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content_tags.quantities[10]
quantity62 electrodes — contacts free of epileptic activity that were examined
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content_tags.quantities[11]
quantity7 electrodes, 5 patients — person-specific electrodes found
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content_tags.quantities[12]
quantity85% (6/7) — person-specific electrodes modulated by sensory evidence
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content_tags.quantities[13]
quantity70% (5/7) — person-specific electrodes showing higher gamma on consciously perceived trials
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content_tags.quantities[14]
quantity0.94 and 0.9 — statistical power to detect a 30% change, uncorrected and corrected
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content_tags.quantities[15]
quantity30–70 Hz and 70–150 Hz — the low and high gamma ranges analysed
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content_tags.quantities[16]
quantity150 ms — duration of the degraded image presentation
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content_tags.quantities[17]
quantity100–500 ms — the post-stimulus analysis window, split into eight 50 ms bins
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content_tags.quantities[18]
quantity60% to 90% in 5% steps — the noise levels used to degrade images
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content_tags.quantities[19]
quantity∼70% — the recognition performance the individual degradation thresholds targeted
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content_tags.quantities[20]
quantity148 pictures, 22 catch images — the patient stimulus set
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content_tags.quantities[21]
quantity44 trials per condition — trials acquired per condition in the patients
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content_tags.quantities[22]
quantity11 experimental blocks — blocks in the main experiment, each with a familiarization and a test phase
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content_tags.quantities[23]
quantitymean 1.5, SD 2.3 — false alarms on the 44 background-only catch trials
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content_tags.quantities[24]
quantity−400 to −100 ms — the prestimulus baseline for power normalisation
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content_tags.quantities[25]
variablecatch trials (control)
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content_tags.variables[4]
variablesensory evidence
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content_tags.variables[7]
variableprevious exposure
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content_tags.variables[8]
variablepercentage of “seen” responses
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content_tags.variables[9]
variablehGBR
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content_tags.variables[10]
variablerelative power
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content_tags.variables[11]
variableMNI coordinates
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content_tags.variables[12]
definitionneural correlates of consciousness
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content_tags.definitions[0]
definitiongamma band responses
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content_tags.definitions[1]
definitioncontrastive method
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content_tags.definitions[3]
definitionperson-selective
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content_tags.definitions[5]
definitioncontrastive method
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content_tags.definitions[6]
definitionSensory evidence
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content_tags.definitions[7]
definitionPrevious exposure
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content_tags.definitions[8]
definitionpower
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content_tags.definitions[9]
definitionfamiliarization phase
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content_tags.definitions[10]
key-termsneural correlates of consciousness, conscious perception, gamma band responses, hGBR, lGBR, sensory evidence, previous exposure, prior knowledge, contrastive method, long-range integration, category-specific, person-selective, repetition suppression, catch images, degradation, subjective task, objective task, visual cortex, fusiform gyrus, lateral occipital cortex, intracranial EEG, anesthesia, Morlet wavelets, false discovery rate, Wilcoxon rank-sum test, Monte Carlo simulations, epileptogenic foci, body-selective areas, familiarization phase
Statistics — cross-field join keys
field-invariant statistical terms, used in their statistical sense (gated on a number / symbol / test). A p-value or a standard deviation means the SAME thing in physics, biology, psychology and sociology — so these are the strongest cross-field join keys. Grounded verbatim.
repeated-measures ANOVA F as written: repeated-measures ANOVA with factors previous exposure
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content_tags.statistics[0]
t-test t as written: t test on the difference of the effects: t (7) = 0.237, p = 0.891
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content_tags.statistics[1]
Wilcoxon rank-sum test as written: nonparametric Wilcoxon rank-sum test
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content_tags.statistics[2]
false discovery rate correction as written: corrected for multiple comparisons using false discovery rate
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content_tags.statistics[3]
Monte Carlo simulation as written: Post hoc power analysis was done with Monte Carlo simulations
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content_tags.statistics[4]
statistical power as written: power corresponds to the proportion of comparisons the Wilcoxon test correctly identifies
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content_tags.statistics[5]
standard error of the mean SEM as written: Error bars indicate SEM
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content_tags.statistics[6]
standard deviation SD as written: mean 1.5, SD 2.3
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content_tags.statistics[7]
repeated-measures ANOVA
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content_tags.statistics[8]
Wilcoxon rank-sum test
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content_tags.statistics[9]
false discovery rate
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content_tags.statistics[10]
Post hoc power analysis
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content_tags.statistics[11]
Monte Carlo simulations
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content_tags.statistics[12]
F
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content_tags.statistics[13]
SEM
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content_tags.statistics[14]
Second readings
a facet read a second time, independently, from its own sentence — and whether the two readings agree
claim typenull-result — a second reading reaching the same value; recorded: null-result
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alternatives.claim_type
methodintracranial EEG over occipital and temporal visual cortex while conscious perception is raised two independent ways — lower image degradation, and prior exposure to the clear image — with the two first shown behaviourally equivalent — a second reading DIFFERING from the recorded value; recorded: electrophysiology
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alternatives.method
phenomenonconscious perception of a degraded image, and its dissociation from local category-specific cortical processing — a second reading DIFFERING from the recorded value; recorded: neural correlates of conscious visual perception
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alternatives.phenomenon

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