Plain wording

Distal dendritic inhibition cuts firing the same way perisomatic inhibition does, by raising the spike threshold rather than by suppressing dendritic spikes.

slug alt-distal-inhibition-raises-somatic-thresholdrole hypothesis

Perisomatic and distal inhibition work through one shared mechanism, so perisomatic inhibition also controls dendritic spiking.

slug alt-perisomatic-and-distal-share-mechanismrole hypothesis

Phase-dependent control of dendritic spikes and spike timing needs many cycles of a rhythm to build up.

slug alt-phase-modulation-requires-builduprole hypothesis

Beta-rhythm inhibition on distal dendrites both raises dendritic spiking in its troughs and suppresses it in its peaks.

slug beta-bidirectional-dendritic-controlrole empiricalpanel fig5, fig7

Clustered apical inputs reach the soma when they arrive in the trough of a distal beta rhythm and are blocked at its peak.

slug beta-gates-distal-apical-inputsrole empiricalpanel fig10

Across a sweep of rhythm frequencies, beta near 20 Hz locks distal dendritic Ca²⁺ and NMDA spikes to phase most strongly.

slug beta-optimal-distal-dendritic-entrainmentrole empiricalpanel fig7

Phase-dependent control of dendritic spikes and spike timing appears within the first few cycles of a beta or gamma burst.

slug burst-effects-emerge-first-cyclesrole empiricalpanel fig9

Ca²⁺ spikes in apical tuft dendrites lead somatic action potentials by about 20 ms, most tightly in the most distal compartments.

slug ca-spikes-couple-20ms-before-aprole empiricalpanel fig2, fig3

Doubling distal dendritic inhibition nearly silences the neuron by shutting down dendritic Ca²⁺ and NMDA spikes, not by raising spike threshold.

slug distal-inhib-drops-firing-02hzrole empiricalpanel fig4, fig5

Changing the delay between excitation and inhibition barely moves the firing rate but changes which dendrites drive the spikes.

slug ei-lag-sensitivity-firing-raterole empiricalpanel fig4

Gamma-rhythm inhibition near the soma gates clustered proximal and basal inputs by phase while leaving distal apical inputs largely alone.

slug gamma-gates-proximal-basal-inputsrole empiricalpanel fig10

Across a sweep of rhythm frequencies, gamma modulates the somatic spike threshold most strongly when inhibition sits near the soma.

slug gamma-optimal-perisomatic-ap-modulationrole empiricalpanel fig8

Gamma rhythms near the soma shift the spike threshold by phase without changing how often dendritic spikes occur.

slug gamma-perisomatic-no-dendritic-spike-changerole empiricalpanel fig5

Perisomatic inhibition controls the soma's spike output, while distal dendritic inhibition controls dendritic spikes and their timing.

slug hypothesis-distinct-compartmental-rolesrole hypothesispanel hypothesis

A rhythm controls a compartment best when its cycle matches the local spike timescale — gamma at the soma, beta at distal dendrites.

slug hypothesis-frequency-compartment-matchingrole hypothesispanel hypothesis

Earlier work found that PV+ interneurons target the soma and accompany gamma, while SST+ interneurons target distal dendrites and beta.

slug interprets-pv-gamma-sst-beta-associationsrole literature-contextpanel fig10 synthesis / discussion

Every result comes from a compartmental model of one layer 5 pyramidal neuron, with no network or population effects simulated.

slug l5-model-single-cell-scoperole scopepanel fig1A

Na+ dendritic spikes in proximal compartments lead somatic action potentials by 2–3 ms, with coupling weakening farther from the soma.

slug na-spikes-couple-2to3ms-before-aprole empiricalpanel fig2, fig3

Synaptic drive uses published experimental parameters and yields a typical in vivo firing rate, with no sensitivity analysis over those choices.

slug naturalistic-drive-parameterizationrole scopepanel fig1A (inset)

NMDA spikes lead somatic action potentials by about 25 ms, longer than Na+ spikes because their kinetics are slower.

slug nmda-spikes-couple-25ms-before-aprole empiricalpanel fig2, fig3

Doubling perisomatic inhibition nearly silences the neuron by raising the spike threshold, while dendritic spikes carry on.

slug perisomatic-inhib-drops-firing-07hzrole empiricalpanel fig4, fig5

Perisomatic inhibition lowers both the neuron's baseline firing and the slope of its input-output curve, compressing its dynamic range.

slug perisomatic-inhib-subtractive-divisiverole empiricalpanel fig5, fig6

Distal inhibition should work best at beta, whose cycle matches the roughly 20–25 ms lead of dendritic spikes over somatic spikes.

slug prediction-beta-optimal-distalrole predictionpanel prediction

Doubling distal dendritic inhibition should cut firing by suppressing apical Ca²⁺ and NMDA spikes, leaving the spike threshold alone.

slug prediction-distal-dendritic-spike-mechanismrole predictionpanel prediction

Perisomatic inhibition should work best at gamma, whose cycles match the 2–3 ms lead of proximal Na+ spikes over somatic spikes.

slug prediction-gamma-optimal-perisomaticrole predictionpanel prediction

Beta at the distal dendrites should gate apical inputs and gamma at the soma should gate basal inputs, each working independently.

slug prediction-orthogonal-input-gatingrole predictionpanel prediction

Perisomatic inhibition should both shift and flatten the somatic input-output curve rather than simply moving its operating point.

slug prediction-perisomatic-input-output-shapingrole predictionpanel prediction

Doubling perisomatic inhibition should cut firing by raising the somatic spike threshold, leaving dendritic Ca²⁺ and NMDA spikes intact.

slug prediction-perisomatic-threshold-mechanismrole predictionpanel prediction

The model explains why PV+ cells pair with gamma and SST+ cells with beta: each rhythm is optimal where that cell type makes its synapses.

slug pv-gamma-sst-beta-correspondencerole interpretationpanel fig10 (synthesis / discussion)