Wilson JTL, Scott JH & Power KG (1987) Developmental differences in the span of visual memory for pattern. British Journal of Developmental Psychology, 5 (3), pp. 249-255. https://doi.org/10.1111/j.2044-835X.1987.tb01060.x
A procedure is described which gives a measure of memory span for patterns. Results are presented from a study of four age groups: 5+, 7+, 11+, and adults. Pattern span increases rapidly between the ages of 5 and 11, by which time it is at the adult level. Span is decreased by an interpolated interfering task, and there is memory decay over a 10 second unfilled interval. The results are interpreted as evidence for a system for representing patterns which is shared by short- and long-term visual memory, but which is distinct from systems for verbal representation.
British Journal of Developmental Psychology: Volume 5, Issue 3