Vocal Fundamental Frequency and Sound Pressure Level in Charismatic Speech: A Cross-Gender and -Language Study.
Rosario Signorello, Didier Demolin, Nathalie Henrich Bernardoni and 3 others
PMID 31196689WHAT IT FOUND
Political leaders adjust pitch and volume to match their audience.
They use higher pitch and wider ranges when addressing large groups to persuade, but lower pitch and narrower ranges when speaking to peers or in informal interviews. This suggests vocal dominance is context-dependent.
Key findings
01Speakers used the highest mean fundamental frequency (pitch) in monologues to followers, intermediate in conferences with peers, and lowest in informal interviews.
02Fundamental frequency and sound pressure level ranges were widest in monologues and narrowest in interviews, indicating more vocal variation when persuading large audiences.
03While some patterns were shared across languages, individual leaders showed distinct strategies for changing pitch and volume over time, reflecting personal style and cultural learning.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study included only 11 speakers, limiting generalizability. Audio was recorded in uncontrolled environments, making absolute volume measures unreliable (though relative range was used). The sample was heavily skewed toward male speakers (9 of 11), with female speakers only from the US. The definition of 'charismatic' was based on prior surveys, which may introduce selection bias.
Declared interests
None declared.
The easy way to misread this
Do not assume that higher pitch and wider range are universally 'better' for all communicative goals. The study found these features were specific to persuading large audiences of followers; leaders lowered pitch and narrowed range when speaking to peers or in informal settings. Context determines the appropriate vocal strategy.