some psychologists, including kosslyn, have argued that such results occur because of interference in the brain between distinct systems in the brain that process the visual and motor mental imagery. subsequent neuroimaging studies showed that the interference between the motor and visual imagery system could be induced by having participants physically handle actual 3d blocks glued together to form objects similar to those depicted in the line-drawings. amorim et al. have shown that, when a cylindrical "head" was added to shepard and metzler's line drawings of 3d block figures, participants were quicker and more accurate at solving mental rotation problems. they argue that motoric embodiment is not just "interference" that inhibits visual mental imagery but is capable of facilitating mental imagery.