In that case, what qualifications are you looking for in volunteers?

And-or, what's the purpose of the experiment, assuming you can tell me that. [ Matt doesn't sound challenging. He's purely curious. Maybe a bit pleased to be back on academic terrain, which is an emotion he never thought he'd feel. ] Where I come from, sometimes there's a worry that knowing an experiment's purpose can bias participants, but that's usually like ... sociological stuff.