[Verse 1] Medial septum, basement drummer, deep below the cortex floor Three-way wiring — cholinergic, GABAergic, glutamate galore Cholinergic keeps the tone up, sets the hum along the stage GABAergic swings the baton, glutamate turns the page Down the fimbria and fornix, cables running to the EC Not one channel, triple threat, a whole orchestra in one deck [Chorus] Septum strikes the seven-hertz bell, disinhibition's the trick Silence the silencer, principal cells go quick No baton, no theta, no grid without the beat Septum's the metronome under the entorhinal street [Verse 2] Here's the clever choreography, listen to the steps GABAergic septal cells don't hit principal cells direct They grab the interneurons, the local bouncers at the door Inhibit the inhibitor, the target fires like before Rhythmic disinhibition, a strobe light on the gate Principal cells stay dark then bright, syncing to the septal rate That's how seven-cycles-per-second theta rolls in waves Not one clock ticking lone — a chorus of downstream slaves [Chorus] Septum strikes the seven-hertz bell, disinhibition's the trick Silence the silencer, principal cells go quick No baton, no theta, no grid without the beat Septum's the metronome under the entorhinal street [Verse 3] Brandon-two-thousand-eleven, Koenig same old year Muscimol drips in the septum, watch the theta disappear Flatline on the LFP, the rhythm's croaked, it's gone Grid cells lose their hexagons, the lattice comes undone Fields that fired in crystal rows go sloppy, smeared, adrift But head direction cells stay locked — no compass loses shift So the beat makes the grid, not the pointer on the dial Dissociation proves the circuits run on separate files [Bridge] But the wire ain't one-way traffic, entorhinal talks right back Feedback climbing up the fornix, closing up the sack Loop within a loop, a conversation not a shout Septum leads the tempo, EC still gets a say about [Verse 4] Now the exercise — don't sleep on it, here's what silence can confess Kill the septum, kill the theta, kill the grid, that tests necessity, yes Oscillatory-interference needs a working clock to run its math So losing theta breaks the model's engine, clears one science path But absence ain't the same as proof of how the engine's built Grids could crash from other wiring, not the interference silt Maybe theta's just permissive, sets a window, not the code — Correlation with a scalpel still won't map the whole road [Chorus] Septum strikes the seven-hertz bell, disinhibition's the trick Silence the silencer, principal cells go quick No baton, no theta, no grid without the beat Septum's the metronome under the entorhinal street [Outro] Septum ticks, cortex listens, rhythm is the report Sparing the direction, breaking the resort Ask the question twice before you trust the frame Necessary ain't sufficient — that's the whole refrain
← C5 — Direct vs Indirect Inputs to CA1 | C7 — Island/Patch Circuits and Contralateral Projections →