The development of intersensory integration had been studied previously in children between 3 and 13 yr. in terms of several spatial dimensions. This research extends the study of intersensory integration across visual and haptic systems with a sample of adults. Four conditions of length estimation were administered, and, for two of them, careful observations were made of Ss' haptic perceptual activity while engaged in perceiving length. Findings indicated a convergence in levels of accuracy for three of the four intersensory conditions by age 18 yr. Haptic perceptual activity was not substantially different at ages 13 and 18 yr.
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