When talking on the phone with his grandpa, 3-year-old ben nodded when asked if his mom was at home. ben is exhibiting what piaget referred to as egocentrism.
Egocentrism, in psychology, the cognitive deficit underlying the inability of both children and adults to acknowledge the idiosyncratic nature of their own knowledge or the internal nature of their own perceptions.
Jean Piaget, a swiss psychologist and biologist developed the scientific study of egocentrism. He tracked children's cognitive development as they emerged from a state of high egocentrism and realized that other people (and other minds) had other perspectives.
In the context of stage-based cognitive developmental theories, sensorimotor infants are highly egocentric. During the first two years of development, the infant is unaware that there are alternative perceptual, emotional, and conceptual perspectives.
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