Air
Hum-vs-Silent Sternum Resonance
Sit upright on the floor, spine free. Compare the two sensations and locating the difference: the silent attempt will likely miss the resonance because the cavity's eigenfrequency depends on tissue tone you cannot voluntarily set.
Full Lesson Notes
Complete Practice
Sit upright on the floor, spine free. Hum at a comfortable low pitch and slide slowly down in pitch until you find the frequency at which the sternum buzzes most strongly — a forced-resonance match between vocal source and chest cavity. Now stop humming and try to reproduce the same buzz silently, by micro-shaking the ribcage at what feels like the same frequency. Compare the two sensations and locating the difference: the silent attempt will likely miss the resonance because the cavity's eigenfrequency depends on tissue tone you cannot voluntarily set. Challenge: The chest-buzz pitch is a coarse readout and the silent comparison is dominated by memory and imagery rather than vibration matching.
