Interhemispheric integration of visual concepts in infancy

Kimberly ScottMassachusetts Institute of Technology, Cambridge, MA, United States
Laura SchulzMassachusetts Institute of Technology, Cambridge, MA, United States

Abstract

Abstraction often requires appropriate integration of more concrete representations. During development, the more specific or localized representations may arise first. Here we study the special case of integration of visual representations from the left and right hemispheres during infancy. We present failures of interhemispheric integration in two domains, form perception and approximate number, in infants ranging from 8 to 18 months of age. In Experiment 1, infants succeeded in representing equality of two shapes only when both shapes were presented in the same visual hemifield. In Experiment 2, infants represented 16 when shown 16 dots in one hemifield but not when shown 8 dots in each hemifield. We argue that interhemispheric integration poses a particular and unusually late-resolved challenge in infant vision.

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