Abstract: The experiment was designed to investigate whether the accuracy ofsize discrimination differs when the discrimination is made in only one sense(Sight or Touch) from those made across two senses of sight and touch inpreschool children.80 preschool children aged 3—6 years old acted assubjects in this experiment.There were four percepual conditions to beinvestigated for variations in degree of accuracy,such as (a) "Sight-Sight"(b) "Touch-Touch" (c) "Sight-Touch"and (d) "Touch-Sight".The resultsindicate that,there was a significant difference between these fourconditions.The most accurate condition of size discrimination was found in"Sight-Sight"condition,the next was "Touch-Touch".The least accuratewas found in the cross modal condition,"Touch-Sight"and "Sight-Touch".The accuracy of discrimination for "Sight-Sight"and "Touch-Touch"increases with age in preschool children,and the peak accuracy ofdiscrimination in the cross modal condition was found in 5 year old children.

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