Abstract
Two competing hypotheses concerning the nature of inter-modal development are outlined. The first sees the development proceeding from a state of discrete, independent sensory systems towards integration and synthesis between modalities. This is contrasted with a second viewpoint in which the early responsiveness of the organism is seen as a-modal and the developmental sequence as one of increasing sensory differentiation. A number of studies which have investigated auditory-visual co-ordination in young human infants, are reviewed. It is concluded that the data support the notion of ontogenetic development being a process of integration between sensory systems that are initially relatively independent.
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