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The effects of 3 weeks of social (control), postural, or object-oriented experiences on 9- to 21-week-old infants' (N = 42) reaching, exploration, and means-end behaviors were assessed. Coders recorded object contacts, mouthing, fingering, attention, and affect from video. Postural and object-oriented experiences advanced reaching, haptic exploration of objects, and developing means-end behavior compared to social experience. Object-oriented experience best-advanced means-end behavior. The results suggest that the development of novel behaviors is dependent on multiple subsystems and can be similarly advanced by addressing a variety of these subsystems. They also suggest that past experiences with active object exploration can facilitate early information processing and the development of early knowledge.
Lobo et al. (Sat,) studied this question.