What is spectral tilt?

Spectral tilt refers to vocal effort and intensity in speech, essentially how much emphasis and articulation are placed on words and syllables. Andrew Huberman explained that changes in spectral tilt result in differences in how sentences are enunciated and accented. For example, a person trying to articulate clearly would emphasize certain words and syllables, while someone with reduced spectral tilt, like a frequent cannabis user, would speak with less vocal effort and intensity, leading to more monotone and less enunciated speech. This can impact the overall clarity and expressiveness of communication 1 .