Cowan, et al. (1999) conducted an example of the ________ of research. They investigated developmental changes in short-term memory for single-digit numbers. Their participants were groups of first graders, fourth graders, and young adults.

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Cowan et al. (1999) used the cross-sectional method, which involves comparing different groups (first graders, fourth graders, and young adults) at a single point in time to investigate developmental changes.

Cowan, Et Al