This advanced undergraduate textbook structures and integrates research on imagery under four headings: imagery as a personal or phenomenal experience; imagery as a mental representation; imagery as a property or attribute of materials; and imagery as a cognitive process that is under strategic control. A major part of the discussion under each of these headings concerns the ways in which the structures, mechanisms, and processes in the brain mediate our subjective experience of imagery and our observable behaviour when we make use of it in cognitive tasks.