[Verse 1] From the postcentral sulcus, watch it carve away, back toward the transverse occipital — but it won't behave, interrupted mid-course, a fracture in the seam, horizontal, occipital segments split the scheme, asymmetric left to right, no mirror, no twin, every hemisphere writes its own rule within. [Chorus] Solco intraparietale, mappa della mente mia, postcentral to occipital, it's a labile line — (labile, meaning restless, quick to bend and change) IPS, IPS, non è mai uguale, Jensen cuts between the gyri, sempre variabile. [Verse 2] Jensen's sulcus intermedius primus draws the seam, supramarginal from angular — a border, not a dream, add the anterior intermediate parietal crease, caudal rami of the temporal refuse to hold their peace, they reshape the angular gyrus, bend it, make it strange — Segal and Petrides, twenty-twelve, confirmed the change. [Chorus] Solco intraparietale, mappa della mente mia, postcentral to occipital, it's a labile line — IPS, IPS, non è mai uguale, hidden boundaries shifting, sempre variabile. [Verse 3] Ono, Kubik, Abernathey, ninety's steady hand, charted every sulcal turn across the human land, Zlatkin and Petrides, twenty-fourteen's return, traced the IPS and the Jensen fold to learn how patterns echo, how they differ brain to brain — the atlas keeps the memory the cortex can't retain. [Bridge] But the deepest pits stay patient, they don't sway or roam, while surface folds are restless, wandering from home, sulcal pits hold steady — anchors in the fold, depth and branching, asymmetry, the story that they hold. Profondità, profondità — the deep part never lies. [Verse 4] IPS zero through five, a visual map unrolled, hIP one, two, three — cytoarchitecture bold, depth and branching point you toward the borders that they hide, function follows folding, form and feature side by side. Volumetric blending turns the banks into a haze, average every brain and lose the local ways — FreeSurfer, MSM-All, surface-aligned and true, follow the folding pattern, bring the signal back to view. [Verse 5] Twin studies whisper softly of a genetic thread, how deep the pits are buried, how the branches spread, but the shallow folds keep drifting, shaped by life and use, nature laying ground rules, nurture turning loose, compare a thousand cortices, the pattern still holds true — one deep root of structure, a thousand ways to grow and strew. The parietal whispers secrets only depth can tell, while surface rivers wander, never settling to dwell. [Chorus] Solco intraparietale, mappa della mente mia, postcentral to occipital, it's a labile line, IPS, IPS, non è mai uguale, Jensen, Segal, Petrides — sempre variabile. [Outro] Variabile, variabile — la mappa cambia ancora, one sulcus, many stories, folding more and more. Profondità, variabile — the cortex sings forever, every brain a different map, every fold a tether.
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