In order to verify claims made by Genevan researchers that linguistic production but not comprehension capabilities distinguish seriators from nonseriators, three tasks were administered to children between the ages of four and eight. Subjects were asked to arrange in order objects varying in size, to describe how the objects differed from each other, and to display comprehension of affirmative and negative comparative and equative constructions. Results failed to support Genevan conclusions. When age differences were minimized, seriators did not differ from nonseriators in the use of absolute or relational terms. However, seriators did display superior linguistic comprehension capabilities. (Author)