Abstract
We report an experiment investigating the mechanisms responsible for short-term memory span and its development by examining the relationship between memory span and speech rate for words and nonwords of differing spoken lengths. Linear functions related memory span to speech rate for both words and nonwords in children of different ages. The functions for nonwords had equivalent slopes (interpreted as reflecting a contribution from a speech-based process) but lower intercepts (interpreted as reflecting a contribution from a long-term memory component) than the functions for words. Children in both age groups studied showed evidence of a relationship between speech rate and memory span and part of the difference in memory span between age groups appears to reflect a difference in speech rate. However, there is also evidence that the long-term memory component of memory span shows greater efficiency in older children.
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