Abstract
A study of 16- and 24-month-old infants' performance on an invisible displacements task examined age differences in infants' search patterns in relation to developing comprehensive search skills. The study focused on problems that involved displacements among three locations within either a three- or a five-location space. Three major classes of comprehensive search skills were found at both ages: (1) persistence—continuing to search until the object is found; (2) nonredundancy—not searching a location more than once; and (3) systematic ordering—utilizing either the spatial arrangement of the locations or their temporal ordering in the displacement sequence to order successive searches among them. The principal developmental change was in the ordering of infants' searches, which corresponded increasingly to the temporal ordering of locations in the displacement sequence.
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