Even synthetic versions of these songs, remixed in the lab, could sometimes elicit vocal organ responses.

To translate the pattern in the brain to a full-blown serenade, a bird’s vocal organ needs to first carry out the marching orders.

Careful instruction and natural intelligence, however, have taught him to properly manipulate the vocal organs whose sound he can never hear.

The problems relate to humans' unprecedented use of the tongue, lips and vocal organs as instruments of communication.

As with any fluid-filled tube, resonances (called formants) change as the vocal organs such as the tongue and velum move.