Abstract
The purpose of this study was to compare preschoolers' performance on linear and row-column scanning selection techniques. Twelve typically developing children between 2 and 4 years of age participated in an identity matching task in which each child was asked to select black and white line-drawn symbols from linear and row-column scanning arrays displayed on the Sentient Systems DynaVox®electronic communication device. Overall errors emitted by participants in linear scanning and row-column scanning were not significantly different. However, substantial differences in errors emitted were noted with regard to (a) number of cursor movements necessary to access the desired symbol and (b) number of passes of the cursor across the symbol display.
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