Hm. But if people really see things in their mind like that, how come so many apparently struggle to draw a bicycle, even though they've both seen and used one? If I ask one of those people to picture a bicycle in their mind, what exactly do they see? Do they see their own distorted version of a bike? When I "picture" something in my mind, I can't really see anything, it's more feelings and words and abstract ideas.…
Visualising an image (of a memory, or an ideal) is a bit like tricking yourself into seeing something. There is no actual bike in your brain, just memories of what parts of a bike look like.
The trick is your brain putting those parts together and presenting that composite as 'a bike'. So i can understand how - some people - can 'see' what they think a bike looks like but then draw a mechanical mess.
Of course there are people with perfect recall, and others who design bikes for a living and so on. I'm really just describing how it could happen for some group of people.