1 Department of Psychology, Faculty of Social Sciences, Aarhus University, Aarhus University2 Department of Psychology and Behavioural Sciences, Aarhus BSS, Aarhus University3 Department of Psychology and Behavioural Sciences, Aarhus BSS, Aarhus University
Object individuation refers to the task of diciding the number of distinct objects present in a given scenario. A central issue within the field of object individuation concerns the kind of information infants rely on when they individuate objects successfully. By means of the violation-of-expectation strategy, the present study reports a comparison of 8.0-, 6.5-, and 5.0-month-old infants' use of featural and spatiotemporal information in an event monitoring design. Using a mirror setup the memory demands was minimized, because all apparent changes in the unexpected test events took place in full view of the infants. The results indicate that while 8.0-, and 6.5-month-old infants individuated objects successfully regardless of whether they were provided with featural or spatiotemporal information, only the 5-month-old infants provided with spatiotemporal information succeeded. The results are discussed in relation to the relevant litterature.