Entwisle, D. R. & Huggins, W. H. (1973). Iconic memory in children. Child Development, 44, 392-394.

In an experiment with first-grade children, 40 slides of landscapes or cityscapes were shown in rapid succession. Later these slides of unremarkable scenes, all unfamiliar to the children, were recognized with surprising accuracy after periods of time varying from a few hours to 1 week. Further observations of second-grade children suggest that children are considerably less proficient in recognizing verbal materials describing the scenes depicted in the slides.