Two groups of children took part in this longitudinal study of eidetic imagery (EI). The New Haven sample consisted of 12 elementary school children, and the Rochester sample consisted of 23 children (aged 7 to 11 years at the beginning of the study). The study was designed to find out some of the qualities of EI and its relationship to memory. An eidetic image was defined as a long-lasting visual image of a figure localized in space in front of the subject, positive in color, and usually on the place where the original figure was shown. The image persists after the stimulus is gone. Subjects were shown pictures one at a time for a brief period and asked to comment on each picture once it had been removed. Study results suggest that eidetic imagery is a stable perceptual ability, without developmental trends as the subject grows older. The amount of information reported on a picture in eidetic imagery differed little from that of normal memory. Study conclusions indicate that EI i s a visual phenomena, not merely a report of vivid memory. Additional research is needed to relate EI to perceptual and developmental theories. (MS)