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Concordance of visual and manipulative responsiveness to novel and familiar stimuli: a function of test procedures or of prior experience?

Concordance of differential visual and manipulative responsiveness to novel stimuli at 6 months of age was found when differential attractiveness and familiarity of the stimuli were controlled. This finding corroborates the findings of an earlier study in which the same object was used as the familiarization object for all subjects. The data indicate that concordance at 6 months of age is not an artifact of the test procedure. A hypothesis suggested by the comparison of these findings with others in the literature is that the opportunity to manipulate a wide variety of objects in the natural environment may contribute to the concordance of visual and manipulative responsiveness to novel stimuli at this age.