Abstract
Right-handed children aged 5, 7 and 11 years were asked to enumerate collections of 2, 3, 4, 5 or 6 dots presented briefly in their left or right visual hemifield. Analysis of variance revealed an overall left visual hemifield superiority for accuracy, interpreted as indicating superiority of the right cerebral hemisphere. Boys showed a greater degree of visual hemifield asymmetry for accuracy than girls. Reaction times for correct enumerations recorded via a voice key were significantly faster to left visual hemifield presentations. Accuracy was found to increase with increasing age, but no developmental trends in laterality were evident with either accuracy or vocal reaction time measures.
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