I'm glad that I specified I was guessing:)
I think both constructs can classify as closures, since both are essentially creating functions that capture their surrounding scope.
http://jim-mcbeath.blogspot.com/2009/05/scala-functions-vs-methods.html has some info on it, but I don't think it is a 100% match to your question. You might try the mailing list if you can't get a satisfactory answer (but please come back;).