Intracranial recordings (ECoG) from nonprimary auditory cortex in the human superior temporal gyrus were reconstructed in to speech sounds.

You may read the article here:
Pasley BN , David SV , Mesgarani N , Flinker A , Shamma SA , et al. 2012 Reconstructing Speech from Human Auditory Cortex. PLoS Biol 10(1): e1001251,

or listen to an example audio of reconstructed speech.

Furthermore, listen to a PLoS Podcast where PLoS Biology Editor Ruchir Shah interviews Brian Pasley and Robert (Bob) Knight from UC Berkeley.

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