[Verse 1] Mountcastle's lab, nineteen seventy-five, Microelectrodes keeping the cortex alive, Area five and its neighbor called seven, Mapping the room like a tactical heaven, "Arm projection" cells fire when you're set to extend, "Hand manipulation" cells wake at the grip, at the end, He named it command apparatus, a general's chart, For working the world just an arm's length apart. [Chorus] Area five, where the hand meets the eye, A living blueprint of where limbs comply, Not just a photograph, not just a plan, It's reach before reaching, the body's own span, Vision borrows touch, touch borrows sight, Area five stitches both into one site, Where is my arm, where's the cup, where's the door, Five computes it before you ever keep score. [Verse 2] Kalaska watched monkeys before they would move, Eighty-three data, a pattern to prove, Cells leaning toward where the arm's about to go, Tuned to direction like a compass held low, Ninety-five with Crammond, the plot thickens more, Area five tracks the limb's state, not just the motor's roar, M1 fires muscle, the twitch and the pull, Five holds the posture, the felt-sense, the full. [Verse 3] Two-thousand, Graziano, Cooke, and Taylor too, Hid the real arm, brought a rubber one into view, Neurons that once read the elbow's true bend, Now fired for the fake arm, a visual friend, Felt position merging with what the eyes behold, The body's address isn't fixed, it's told, A story cortex writes from signals it's fed, Not carved into bone, but spun from a thread. [Verse 4] Buneo, two-thousand-two, in Nature's bright page, Said hand-to-target vectors are five's chosen stage, Not eye-only, not hand-only, a mix instead, A combined eye-hand frame living in your head, Gaze shifts the target, the vector recalculates, Space isn't static, it constantly updates, This is the chapter on frames you'll recall, Five speaks geometry, the cortex's call. [Bridge] Now the rubber hand lying still on the table, Botvinick and Cohen, ninety-eight fable, Stroke the fake hand while the real one hides, Soon you feel touch where the rubber resides, Ehrsson, two-thousand-four, watched the brain ignite, Intraparietal sulcus and premotor alight, This chimeric hand, a seeming not a lie, Borrows your body schema, makes you occupy. [Chorus] Area five, where the hand meets the eye, A living blueprint of where limbs comply, Not just a photograph, not just a plan, It's reach before reaching, the body's own span, Vision borrows touch, touch borrows sight, Area five stitches both into one site, Where is my arm, where's the cup, where's the door, Five computes it before you ever keep score. [Outro] From Mountcastle's map to the rubber hand's spell, The parietal cortex knows your body well, Command apparatus, vectors, and skin, Area five is the space you live in.
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