Renee Baillargeon Experiment Summary

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Summary of the Experiment
Renee Baillargeon (1985) who, using the solidity principle, concluded that “infants’ understanding of the principle that a solid object cannot move through the space occupied by another solid object” (p.195) would indicate an understanding of object permanence, the idea that objects continue to exist even when out of sight. This theory was brought to life using an experiment in which a screen was lifted in front of a box in two ways: a possible event in which the screen was lifted until it hit the box before returning to its previous position and an impossible event, in which the screen traveled a 180-degree arc, seemingly going through the box to lie flat on the floor again. Five-month-old infants were subjected to …show more content…

One strength was that Baillargeon necessitated that the experiment not rely on “the extension or reproduction of an action, or (2) knowledge about superficial properties of object disappearances,” (Baillargeon, 1985, p.195) meaning the baby’s emotions and reactions were the evidence of object permanence, eliminating the errors of previous experiments. Furthermore, habituating the infants to the movement of the screen a 180-degree arc prevented infant shock in the real experiment from simply seeing the screen move, ensuring genuine reactions during the experiment. One weakness was that Baillargeon (1985) relied on the “assumption that infants react to novel or surprising events with prolonged attention” (p. 196). Staring, however, is frequent and common-place for infants thus invalidating it as an accurate measure of surprise. Furthermore, pro-longed attention indicating surprise in infants is only an assumption and its unknown whether this phenomenon has been proven true. Lastly all the families in the experiment were contacted by phone, meaning that each family was of a certain socio-economic status. Higher income families have more resources to care of their children and could therefore introduce their children to stimuli that better inhibit their understanding of object

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