Developmental psychologists generally focus their study on the unusual individuals in order to learn about the extremes of human development.

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Developmental psychologists usually focus on typical individuals, because they hope to better understand developmental processes that are common to nearly all normal individuals. Psychologists interested in the study of abnormal psychology or individual differences would be more likely to study unusual individuals as a method of understanding deviation.
The Nature of Human Development

Developmental Psychologists Generally Focus Their Study on the Unusual Individuals