Abstract
Infants between 3 and 4 months of age habituated either to repeated presentations of a shape undergoing, successively, one of two rigid motions, or, to repeated presentations of rigid motion while two shapes were varied successively. A comparable habituation response was obtained for both visual fixation duration and a cardiac measure, change in inter-beat interval. Generally, the results indicated that infants of this age can detect change of shape in a moving object and similarly they can detect change in a particular motion transformation when shape is held constant. Although there was some discrepancy between the results obtained between the visual and cardiac responses during the dishabituation trials the data suggested that infants were responding to change between stimulus events. The notion that infants were able to respond to properties of a stimulus, gained as invariant information from the motion transformation they under-went, was not supported.
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