Gesell test objects, United States, 1911-1939
Arnold Gesell (1880-1961) pioneered the study of normal child development. Gesell took ‘normal’ to be healthy children, based on comparison with other children. Gesell put children from newborns to six year-olds through filmed tests using these objects at his Yale clinic for Child Development in the United States. He established behaviour patterns using the observed results. For example, at 15 months a ‘normal’ child will build a tower of two blocks; at four years, a tower of ten.
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Glossary: child development test object
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Glossary: bell - idiophone
Percussion vessel consisting of a hollow object, usually of metal but in some cultures of hard clay, wood, or glass, which when struck emits a sound by the vibration of most of its mass; they are held in position at their vertex, the point farthest from their rim, and their zone of maximum vibration is towards the rim.