Radiolab Radiolab

A 4-Track Mind

Oct 2, 2026 · 21m

Summary

This episode features a Radio Lab classic about Bob Milne, a ragtime pianist who can mentally hear and track four full symphonies simultaneously. Neurologist Kirsten Batterman tested his ability using an MRI, confirming he can accurately recall complex pieces while a control conductor failed. The story explores how Bob’s unique emotional and spatial visualization of music allows him to process multiple streams of sound without interference.

Topics discussed

AT&T iPhone 18 Pro sponsorship Introduction of Anisa and the fanny pack concept Design details of the Radio Lab fanny pack Join the Lab membership promotion Lulu introduces the '4-Track Mind' episode Jad and Robert introduce Bob Milne Bob's background and love for ragtime The challenge of playing multiple rhythms Bob's claim of hearing multiple symphonies Skepticism and the need for a test Setting up the fMRI experiment and controls Single-symphony tracking results Multi-symphony task: Conductor fails Bob successfully tracks four symphonies Explanation: Emotional connection to keys Capital One sponsorship and Sl Advice Explanation: Visualizing orchestras in 3D Bob's immersive auditory experience Bob's lifestyle and current projects Outro, credits, and funding acknowledgments
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