Can imaginative powers be increased? Has there been any research on the subject? Say I spend an hour every day with my eyes closed in a state of deep concentration and building mind palaces, will it have any positive effect? I have a very strong inner voice and can easily reproduce songs, recordings, human voices, and other noises, but my mind eye is lacking. All I can picture are murky dark shapes, complex structures or faces tend to only flicker before falling apart.