Opening Holes in the Blanket of Inhibition: Localized Lateral Disinhibition by VIP Interneurons — TEI-tagged view

Karnani, Jackson, Ayzenshtat, Hamzehei Sichani, Manoocheri, Kim, Yuste · 2016 · neuroscience · doi:10.1523/jneurosci.3646-15.2016 · 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. Same method caveat as the companion Karnani 2016 paper: 'electrophysiology' is anchored to the slice recordings, but the headline in vivo result uses two-photon calcium imaging plus single-cell two-photon optogenetic activation, which the vocabulary cannot express. Claim type is 'mechanism' (disinhibition happens because VIPs inhibit SOMs which inhibit PCs); the quantitative ~120 um reach could equally be read as an 'existence' measurement. The 'spotlight of attention' framing is offered as speculation, not a tested claim, so it is not tagged. 2026-08-13, 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.
6 quotations on this page contain a reference number where the paper printed a superscript. This journal style prints citations as raised numerals — parameters12,13 — and the extraction flattened them into the line, so the sentence reads parameters 12 , 13 . The digits are citation markers and not part of what the author wrote. The quotes keep them for the same reason they keep every other extraction fault: a quote is reproduced exactly or it proves nothing.
Other fields define these differently the same word, defined another way in another discipline
standard deviation 3 fields
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
blanket of inhibition disinhibition6 VIP14 SOM12 PV22 pyramidal cells2 lateral inhibition2 two-photon optogenetics C1V1 GCaMP6s5 spotlight of attention spiral2 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
phenomenonlocalized lateral disinhibition by VIP interneurons— “Our data indicate that VIPs can make ∼240 μm diameter holes in the blanket of inhibition mediated by SOMs ( Fino and Yuste, 2011 ; Karnani et al., 2014 ).”
claim-typemechanism— “The data in Figure 1 indicate that VIPs specialize in lateral disinhibition and can block FDDI by inhibiting SOMs.”
method — evidence— “In this study, we show with intracellular recordings and optogenetics in neocortical layer 2/3 that VIP activation can override lateral disynaptic inhibition between PCs in slices.”
object of study — evidence— “However, little is known about the fine structure of PC disinhibition through the VIP→SOM→PC circuit, although recent evidence suggests a spatially restricted mode of action for this circuit that may be related to “the spotlight of attention” ( Zhang et al., 2014 ). This facilitation of visual responses is enhanced during locomotion ( Fu et…
research question — evidence— “Inhibitory interneurons in the neocortex often connect in a promiscuous and extensive fashion, extending a “blanket of inhibition” on the circuit. This raises the problem of how can excitatory activity propagate in the midst of this widespread inhibition.”
contribution — evidence— “Although our in vitro results may be underestimates due to the inevitability of cut processes in brain slices, the similarity of the in vivo results increases their credibility, and together the data suggest a ∼120 μm lateral radius of effect for single VIPs.”
transferfrom attention research: the spotlight metaphor, imported as the functional interpretation of a local disinhibitory hole— “VIP interneurons, themselves regulated by neuromodulators, may therefore enable selective patterns of activity to propagate through the cortex, by generating a “spotlight of attention”transfers[0]
transferfrom dynamical systems: attractors, offered as what selectively sculpted circuits might implement— “This type of local control could be use to dynamically sculpt selective cortical circuits out of a neural network type of connectivity matrix, and use them to implement specific perceptions, behaviors, memory states or, more generally, dynamical attractors.”transfers[1]
mechanismA VIP cell inhibits nearby SOM cells, which removes the SOM-mediated blanket inhibition on local pyramidal cells and thereby lets excitation spread through that patch.— “The data in Figure 1 indicate that VIPs specialize in lateral disinhibition and can block FDDI by inhibiting SOMs.”mechanisms[0]
mechanismThe horizontally narrow VIP axon confines the disinhibitory action to a small cylindrical volume of cortex, setting the size of the hole.— “A horizontally narrow axon ( Fig. 2 A–D ) may restrict the area of effect of a single VIP to a small cylindrical volume of cortex.”mechanisms[1]
mechanismDuring locomotion many VIPs are recruited at once, so the disinhibition from any single stimulated VIP is swamped and loses its spatial structure.— “This is likely because of the increased neuronal activity and recruitment of many more VIPs than the stimulated one during locomotion.”mechanisms[2]
mechanismthe problem: SOM, PV and chandelier cells inhibit most or all pyramidal cells within their axonal arbors, which in principle should stop excitation propagating at all— “Members of the SOM, PV, and chandelier cell populations mediate a broad blanket-like inhibition of most if not all PCs within their axonal arbors ( Fino and Yuste, 2011 ; Packer and Yuste, 2011 ; Karnani et al., 2014 ; Inan et al., 2013 ). This widespread inhibition, in principle, should suppress the propagation of excitatory activity in…mechanisms[3]
mechanismthe interneuron population looks designed to block both fast and slow excitatory activity, since PV and SOM are driven by fast and slow inputs respectively— “In fact, because PV and SOM are activated specifically with fast and slow inputs, and relay fast and slow inhibition, it seems as if the interneuron population was selectively designed to block both fast and slow excitatory activity.”mechanisms[4]
mechanismVIP cells inhibit nearby SOM cells, and SOM cells inhibit pyramidal cells, so activating one VIP opens a local hole in the inhibitory blanket— “We find that VIP interneurons have narrow axons and inhibit nearby somatostatin interneurons, which themselves inhibit pyramidal cells. Moreover, via this lateral disinhibition, VIP cells in vivo make local and transient “holes” in the inhibitory blanket extended by SOM cells.”mechanisms[5]
mechanismtwo-photon spiral scanning excites one targeted VIP and not its neighbours, which is what makes single-cell activation possible— “Targeting the stimulation to other nearby VIPs did not excite the recorded VIP”mechanisms[6]
mechanismthe disinhibitory effect requires concurrent sensory drive - there must be activity for the hole to admit— “As the presence of sensory stimulation ( Fig. 6 ) was required for seeing the disinhibitory effect of single VIP activation (data not shown) the spatiotemporal coincidence of excitation and a disinhibitory hole may be necessary to use the hole in blanket inhibition.”mechanisms[7]
mechanismtwo possible regimes: single VIPs opening tiny patches, or a few nearby VIPs together opening larger ones— “VIPs may be active individually, e.g., during low-activity states or a specific input from prefrontal cortex ( Harris and Thiele, 2011 ; Zhang et al., 2014 ). This mode of activity may thus form highly localized disinhibited patches of cortex. Alternatively, a few closely spaced VIPs may be preferentially activated together, thus forming…mechanisms[8]
extends Kapfer et al. (2007), Silberberg and Markram (2007) and Murayama et al. (2009) on SOM-mediated frequency-dependent disynaptic inhibition— “While many experiments are consistent with SOMs mediating frequency-dependent disynaptic inhibition (FDDI) between neighboring PCs, a…claim_relations[0]
replicates Zhang et al. (2014) on the uniquely localized disinhibitory effect of VIP cellsclaim_relations[1]
extends Pi et al. 2013 and Fu et al. 2014 on the VIP to SOM disinhibitory motif - both independently tagged in this corpus
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.
claim_relations[2]
supports Zhang et al., who also found VIPs uniquely localised with a radius under 200 microns
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claim_relations[3]
supports morphological reports that VIP axons are horizontally restricted
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claim_relations[4]
extends Fu et al. 2014 on locomotion driving VIP activity, by showing the spatial structure is lost in that state
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claim_relations[5]
senseblanket of inhibition is the specific claim that SOM, PV and chandelier cells inhibit most or all pyramidal cells within their arbors indiscriminately - it is what makes disinhibition necessary rather than merely available
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senses[0]
sensethe hole is measured four different ways - axon extent, paired connectivity, activity correlation, and single-cell optogenetics - and reported as a radius of about 120 microns, equivalently a diameter of about 240
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senses[1]
sensespotlight of attention is used as an analogy for what a local disinhibitory hole could implement, not as a claim that it does
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senses[2]
sensedisinhibited is defined operationally as a visual response increasing by more than two standard deviations during VIP activation
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senses[3]
controlthe same analysis re-run triggering on the other cells, mostly pyramidal cells, instead of the original trigger cells — held — rules out a result that follows from which cell was chosen as the trigger rather than from the population structure
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controls[0]
noteVIP —causes→ SOM — inhibits. same edge as Fu2014 and Pi2013 - three corpus papers now carry it, from three labs
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concept_edges[0]
weightVIP —causes→ SOM — 0.95
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concept_edges[0]
weightSOM —causes→ pyramidal cells — 0.95
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concept_edges[1]
auditVIP —operationalised-as→ spotlight of attention — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but VIP interneurons 'MAY' enable propagation by generating a spotlight of attention; operationalised-as is loose and hedged.
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concept_edges[4]
noteVIP —operationalised-as→ spotlight of attention — explicitly an analogy - may therefore enable. the low weight carries that this is offered, not shown
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concept_edges[4]
weightVIP —operationalised-as→ spotlight of attention — 0.4
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concept_edges[4]
auditSOM —operationalised-as→ lateral inhibition — Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but lateral inhibition 'IS THOUGHT TO work through' SOMs - a mechanism; operationalised-as is loose.
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concept_edges[5]
evidential statusSOM —operationalised-as→ lateral inhibition — ATTRIBUTED, NOT MEASURED HERE: the span reports what the field holds - 'disynaptic lateral inhibition between nearby pyramidal cells' 'is thought to work through somatostatin-expressing INs' - with three citations (Kapfer et al. 2007; Silberberg and Markram 2007; Adesnik et al. 2012). This paper's own title is 'Opening holes in the blanket of inhibition', so the received account is the thing it goes on to complicate.
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concept_edges[5]
noteSOM —operationalised-as→ lateral inhibition — RE-GROUNDS another row of this record: the old span named ONE endpoint.
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concept_edges[5]
weightSOM —operationalised-as→ lateral inhibition — 0.9
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concept_edges[5]
outcome (stated by the tagger, no quotation)control — heldcontrols[0]
for which uselimitation — every conclusion in the paper, by layer: AS ALL OUR RECORDINGS WERE FROM LAYER 2/3, THEY ONLY APPLY THERE, and VIPs MAY MEDIATE QUALITATIVELY DIFFERENT EFFECTS IN THE DEEPER LAYERS
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limitations[0]
for which uselimitation — the spatial-reach measurement: OUR IN VITRO RESULTS MAY BE UNDERESTIMATES DUE TO THE INEVITABILITY OF CUT PROCESSES IN BRAIN SLICES
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limitations[1]
for which uselimitation — the direction of the in vivo effect: the results are consistent with VIPs disinhibiting nearby cortex BUT MIGHT EQUALLY ARISE FROM the nearby cells driving the VIPs
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limitations[2]
for which uselimitation — the same scope as limitations[0] - layer 2/3 only
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limitations[3]
for which uselimitation — the same scope as limitations[1] - cut processes underestimate reach
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limitations[4]
duplicate oflimitation — limitations[2]
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limitations[5]
for which uselimitation — the same scope as limitations[2] - the correlation does not fix the direction
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limitations[5]
for which uselimitation — the spatial-structure result outside quiescence: DURING LOCOMOTION EPOCHS THE DISTANCE DEPENDENCE WAS SCRAMBLED, attributed to recruitment of many more VIPs
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limitations[6]
for which uselimitation — the completeness of the disinhibition account: BECAUSE THE INHIBITED CELLS FORMED <1% OF ALL CELLS, WE DID NOT ANALYZE THEM FURTHER, THOUGH WE NOTE THEY MAY BE SOMS - cells that behaved oppositely were set aside
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limitations[7]
for which uselimitation — the stated requirement for sensory stimulation: it WAS REQUIRED FOR SEEING THE DISINHIBITORY EFFECT OF SINGLE VIP ACTIVATION (DATA NOT SHOWN) - the condition for the central effect rests on data not in the paper
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limitations[8]
replicationuntested
limitationAll recordings came from layer 2/3, so the conclusions do not necessarily hold for deeper layers.
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limitations[0]
limitationSlice measurements of spatial reach may underestimate the true extent because processes are cut.
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limitations[1]
limitationThe correlational in vivo data are directionally ambiguous: nearby cells could be driving the VIPs rather than the reverse.
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limitations[2]
limitationall recordings are from layer 2/3 and the authors say the conclusions only apply there
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limitations[3]
limitationslice results may underestimate the reach because processes are cut
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limitations[4]
limitationthe correlational results could equally reflect nearby cells driving the VIPs rather than the reverse, which is why the optogenetic experiment was needed
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limitations[5]
limitationduring locomotion the spatial structure disappears, attributed to many more VIPs being recruited
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limitations[6]
limitationsix cells were inhibited rather than disinhibited and were set aside as under 1% of the sample
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limitations[7]
limitationthe requirement for sensory stimulation is supported by data not shown
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limitations[8]
Content tags
content-observations: finding · quantity · variable · definition · key-term — grounded in the full text
findingOptogenetically silencing SOM interneurons abolished the disynaptic inhibition between paired pyramidal cells, giving direct loss-of-function evidence that SOMs mediate lateral inhibition.
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content_tags.findings[0]
findingActivating VIP interneurons during the presynaptic spike train also blocked the disynaptic inhibition, showing VIPs can veto lateral inhibition.
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content_tags.findings[1]
findingReconstructed VIP axons were narrower than SOM or PV axons and descended away from the pia.
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content_tags.findings[2]
findingSOMs postsynaptic to a VIP were significantly closer to it than unconnected SOMs, so VIP inhibitory output is spatially restricted.
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content_tags.findings[3]
findingTwo-photon activation of a single VIP in vivo disinhibited visual responses selectively in cells near the stimulated VIP.
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content_tags.findings[4]
findingThe disinhibitory reach of one VIP cell measured about 120 μm in radius, i.e. a hole roughly 240 μm across.
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content_tags.findings[5]
findingSpontaneous VIP activity was closely tied to activity within a 50 um radius, whereas pyramidal-cell activity showed only weak distance dependence.
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content_tags.findings[6]
findingThe spatial localization of the single-VIP effect disappeared during locomotion.
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content_tags.findings[7]
findingdisinhibited cells sat significantly closer to the activated VIP than cells in general, 66 against 101 microns
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content_tags.findings[8]
findingthe effective disinhibitory radius of a single VIP is about 120 microns
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content_tags.findings[9]
findingequivalently, VIPs open holes of about 240 microns diameter in the SOM blanket
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content_tags.findings[10]
findingconnected VIP-SOM pairs sat closer together than unconnected ones, 112 against 163 microns
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content_tags.findings[11]
finding33 of 638 cells were disinhibited and 6 were inhibited by single-VIP activation
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content_tags.findings[12]
findingthe spatial structure of the effect disappears during locomotion
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content_tags.findings[13]
findingtargeting a neighbouring VIP did not excite the recorded one, establishing single-cell resolution
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content_tags.findings[14]
quantity33/638 cells — cells whose visual responses were significantly disinhibited by single-VIP activation, out of all imaged cells
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content_tags.quantities[0]
quantity∼240 μm — diameter of the disinhibitory hole a VIP opens in SOM-mediated blanket inhibition
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content_tags.quantities[1]
quantity440 ± 53 μm, 233 ± 29 μm — vertical and horizontal axon extent of VIP cells, against 756 ± 85 / 615 ± 82 μm for SOMs
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content_tags.quantities[2]
quantity41 ± 16 ms — onset latency of the disynaptic inhibition in the second pyramidal cell after the spike train began
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content_tags.quantities[3]
quantitysix of eight — individual VIP cells successfully driven to spike by targeted two-photon spiral stimulation in slices
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content_tags.quantities[4]
quantity112 ± 25 μm vs 163 ± 14 μm, p = 0.01 — intersomatic distance of SOMs connected versus not connected to a recorded VIP
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content_tags.quantities[5]
quantity∼233 μm/2 = 116 μm ... ∼112 μm — convergent anatomical and functional estimates of a single VIP's lateral reach
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content_tags.quantities[6]
quantityabout 120 microns — effective disinhibitory RADIUS of a single VIP cell
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content_tags.quantities[7]
quantityabout 240 microns — the same result expressed as a DIAMETER - not a discrepancy with the 120 figure
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content_tags.quantities[8]
quantityaxons about 233/2 = 116 microns laterally; SOMs inhibited within about 112; correlations raised at 75 to 150; optogenetic disinhibition within 60 to 120 — four independent estimates of one quantity, converging on about 120 microns
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content_tags.quantities[9]
quantityconnected 112 plus or minus 25 microns, not connected 163 plus or minus 14, p = 0.01 — VIP to SOM connection probability against distance
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content_tags.quantities[10]
quantitydisinhibited 66 plus or minus 9 microns against all cells 101 plus or minus 2, p = 0.002 — how much closer the affected cells were
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content_tags.quantities[11]
quantity33 disinhibited, 6 inhibited, 599 unchanged of 638 cells across 27 experiments — the classification outcome
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content_tags.quantities[12]
variabletwo-photon optogenetic activation (independent)
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content_tags.variables[0]
variabledistance from spiral target (independent)
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content_tags.variables[1]
variablechange in visual responses (dependent)
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content_tags.variables[2]
definitionblanket of inhibition
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content_tags.definitions[0]
definitiondisinhibition
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content_tags.definitions[1]
definitionfrequency-dependent disynaptic inhibition (FDDI)
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content_tags.definitions[2]
definitionholes in the blanket of inhibition
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content_tags.definitions[3]
definitionlocomotion epoch
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content_tags.definitions[4]
definitionblanket of inhibition
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content_tags.definitions[5]
definitiondisinhibited cells
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content_tags.definitions[6]
key-termsblanket of inhibition, disinhibition, VIP, somatostatin, parvalbumin, pyramidal cells, lateral inhibition, two-photon, optogenetics, C1V1, GCaMP6s, spiral, visual cortex, layer 2/3, spotlight of attention, interneuron, locomotion, vasoactive intestinal peptide, neocortex, axon
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.
rank sum test p
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content_tags.statistics[0]
paired t-test p
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content_tags.statistics[1]
t-test as written: unpaired Student's t tests
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content_tags.statistics[2]
correlation as written: Pearson's correlation
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content_tags.statistics[3]
z-test p as written: Z test against zero
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content_tags.statistics[4]
standard deviation SD as written: >2 × SD
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content_tags.statistics[5]
standard error of the mean SEM as written: mean ± SEM
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content_tags.statistics[6]
rank sum test
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content_tags.statistics[7]
Z test against zero by distance bin
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content_tags.statistics[8]
pairwise Pearson correlation against intersomatic distance
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content_tags.statistics[9]
Second readings
a facet read a second time, independently, from its own sentence — and whether the two readings agree
claim typemechanism — a second reading reaching the same value; recorded: mechanism
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alternatives.claim_type
methodtwo-photon optogenetic activation of individual VIP cells with C1V1 during calcium imaging in vivo, plus paired slice recordings and morphological reconstruction — a second reading DIFFERING from the recorded value; recorded: electrophysiology
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alternatives.method
phenomenonlateral disinhibition in neocortex — a second reading DIFFERING from the recorded value; recorded: localized lateral disinhibition by VIP interneurons
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alternatives.phenomenon

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