| Clue | Source | Date |
|---|---|---|
| Speech that ends sentences with rising tones | New York Times | 02 Mar 2023 |
| Rise in pitch that can make a statement sound like a question | The Washington Post | 13 May 2022 |
| Rise in pitch that can make a statement sound like a question | LA Times Daily | 13 May 2022 |
| Speaker's rise in pitch |