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Halford, Graeme S. – 1985
Cognitive development proceeds through a series of four levels. The first is the single-class level, attained by infants at approximately 1 year of age. At the single-class level, concepts are based on element similarity or convention (for example, images and words for common objects). The second level is the relational level, attained by toddlers…
Descriptors: Age Differences, Child Development, Cognitive Ability, Cognitive Development
