Chronometric studies of imagery researchers have concerns of self-report: why participants are not asked to describe images, instead things are put objectively to examine how fast judgements are (chronometric=time measuring, mode of presentation is important, ex. When describing a cat prominent and distinctive features will come up such as whiskers, pointy ears, etc. When depicting (drawing) a cat, size and proportions are more prominent: descriptive=verbal, kosslyn study: participants asked to imagine cats responded to questions quicker about the head than the claws. Photographic which is referred to as eidetic imagery: often found in people with autism, very little is known about this type of imagery. Dual coding advantage of retrieving images if you can code a visual image and a verbal one: you have 2 different types of memories: ones that have content of symbolic materials and ones that represent imagery-based materials.