I hope this isn't obvious (although maybe it's better if it is)! I'm working with an interview transcript and I have a participant who says 'Hmmm?' in a way that I want to discuss. Unfortunately, I don't know how to refer to it. Here's an example of what he's saying (note, he's a non-native speaker):
- Interviewer: Did you help them yourself?
- Participant: Hmmmm?
- I: Did you personally help them, or was it..
- P: Oh yes, I...
And so on. I don't think it's a vocalized pause or a filler word, since he's not speaking at length, just prompting the interviewer to provide clarification. Does this type of sound/question have a name, or am I completely off track?