One experiment conducted by this psychologist asked participants to count the number of objects in two rows, noting that those who count correctly despite the spacing of gaps between the objects demonstrate the idea of conservation of number.  
One experiment conducted by this psychologist asked participants to count the number of objects in two rows, noting that those who count correctly despite the spacing of gaps between the objects demonstrate the idea of conservation of number.  After having worked under Alfred (*) Binet, this man theorized that intelligence was a form of adaptation consisting of the steps of taking in material from the environment and then changing one's mind to account for that material, steps he termed assimilation and accommodation.  He borrowed Kant's idea of schemas to classify the clusters of thoughts in a certain group of people; he also theorized that members of that group develop the capacity to realize that items that are not sensed still exist, known as object permanence, at the end of the sensorimotor stage.  For 10 points, name this Swiss child psychologist.
One experiment conducted by this psychologist asked participants to count the number of objects in two rows, noting that those who count correctly despite the spacing of gaps between the objects demonstrate the idea of conservation of number.  
Jean Piaget