Some people have inner dialogues. Some authors are literally writing down what characters are saying in their head, and sometimes what they see them "do" as well.
replyMe here, inner dialogue frequently, inner monologue never (self-directed speech like "okay now I need to pick up the ...")
replyMy inner dialogues almost always come with full fidelity, visual, audio, tactile, I can still smell the Marlboros on my dad's flannel even though he stopped smoking 20+ years ago.