Abstract
This study examines the perception of the property of weight in infants’ early manipulation. What is the baby’s reaction when facing visually identical objects differentiable only by hand manipulation ? Will babies use the property of weight in a functional way ? We presented to 8, 11 and 14 month-old infants four closed egg cups, three light (30g) and a heavy one (160g), during four minutes of free play. Total duration of looking at the objects, total time of manipulation, contact time with each object, exploratory actions and objects’ arrangements in space were scored. Results indicated that the heavy object (called the ‘trap object’) was more watched, more manipulated and more lifted than the light ones as early as 8 months. Objects’ arrangements in space revealed an evolution with age and are in favour of an integration of this tactilo-kineasthetic object property into free manipulation.
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