@seeingwithsound That is interesting that cue-induced imagery is different from self-induced one. I would have thought they would both be similarly top-down. It seems the authors state that the "vividness" of the imagery is higher for cue-induced, meaning that the bit of visual cortex involvement in cue-induced imagery is helping with the vividness.
@hkl Well, yes, although I could imagine that one of the two mental imagery "flavors" originates from the temporal lobe (or parietal cortex) and the other from frontal cortex; wished we could see in which direction activation flows.