Comment by glenstein

I honestly don't think that people's self reports of whether they have an internal monologue are super reliable. They can mean different things by it or be psychologically attached to a particular representation of their thought processes, it can be related to self concept or self esteem or personal perspective in ways that are hard to tease out.

I think something like this proved to be true when it came to folk theories of different learning styles (e.g. visual vs language based) once those started being tested in rigouros ways. People could still be right but I would be interested to see what we get if we test more directly for subvocalization or fmris for language based brain activity.