[moffkalast]

> Were they actually imagining more but were unable to put it into words? Were they underestimating the vividness of what they were imagining? Or were they accurately describing what was in their minds?

I suppose some people may imagine a "default apple" when given the prompt which would already have some parameters while others might try recreating an arbitrary apple from scratch in their head which wouldn't be very detailed. The object is only as detailed as you make it in your mind, which might take some creativity if you're not thinking about a specific one you've seen before. If you don't give it colour or smell it won't have any, it'll just be like a generic shape.