[Verse 1]
Mossy fibers wander in, whispering a hum,
Exciting granule cells, the tiniest of the sum,
Millions packed together in a layer down below,
Their axons climb up high and become parallel fibers, oh,
One signal turns to thousands, spreading like a fan,
Expansion recoding — that's the cerebellum's plan.
[Chorus]
Parallelfasern, fliegen through the tree,
Mille petites fibres, dancing endlessly,
Purkinje cell is listening, two hundred thousand strong,
Un seul climbing fiber sings the error song.
[Verse 2]
Picture the Purkinje cell, a fan-shaped silhouette,
Arborization — branches you won't soon forget,
A flat and spreading dendrite catching every spark
From parallel fibers passing, commuters in the dark.
Two hundred thousand whispers vote but never seem to shout,
Each one a tiny nudge in how the movement plays out.
[Chorus]
Parallelfasern, fliegen through the tree,
Mille petites fibres, dancing endlessly,
Purkinje cell is listening, two hundred thousand strong,
Un seul climbing fiber sings the error song.
[Verse 3]
That lone one's the climbing fiber, from the inferior olive deep,
It coils around the dendrite tight, no secrets left to keep,
While parallel fibers murmur in a chorus, in a crowd,
This single thread delivers error — blunt, undeniable, loud.
A paucity of wiring next to such a vast array,
Scarce, yet so decisive — it still gets the final say.
[Bridge]
Wenn beide feuern gleichzeitig — climbing and parallel paired,
LTD takes hold, the active synapse is impaired,
Synapses depress eux, whenever error meets the beat,
Marr et Albus showed us how movement learns from defeat.
Not louder, but discerning — that's the lesson that we keep,
Ein Fehler macht uns besser — error makes the learning leap.
[Verse 4]
Purkinje's answer isn't cheer, it's hush, an inhibiting choir,
Projecting to deep nuclei, dampening the fire,
The movement gets refined, the error shrinks down small,
C'est le cervelet qui corrige — balance through it all.
[Verse 5]
Long after the spark fades, the pathway still remembers,
Synaptic weights rewritten, turning embers into embers,
The cerebellum stores each lesson deep within its code,
Chaque mouvement appris allège un peu la route,
Memory of motion carved in quiet, patient lines,
A symphony of corrections — written between the lines.
[Chorus]
Parallelfasern, fliegen through the tree,
Mille petites fibres, dancing endlessly,
Purkinje cell is listening, two hundred thousand strong,
Un seul climbing fiber sings the error song.
[Outro]
Mossy, granule, parallel — the climb up to the crown,
One Kletterfaser whispers where the movement settles down,
Lerne durch die Fehler, corrige, corrige encore,
That's the cerebellar circuit — teaching us once more.