I knew I was an aphant since age 7 and did not think about it. At least until a chance comment led to a continuing research in the area. Since I do not have imagery thinking is in the form of words. Usually, a dialogue or lecture format. My inner voice is an active speaking on my part, but many hear rather than speak.
Here is an experiment to try. I assume everyone has had the experience of a “song going through your head”. I would be curious as to how many have not had that experience. But, for those who do: Who is doing the singing? I am doing the singing, but I have found about an even split. Two questions
1) Is whether you hear the singer or do the singing depend on whether you hear or speak your inner voice?
2) What do those who think in images experience?