Emotional Deprivation in Infancy. 1948 Study comparing orphans to home babies.

You may also be interested in books by Rene Spitz that were written on his influential research: https://amzn.to/3aL7D8x #ad
Silent. Compares children raised by families, to those in orphanages. Part of Rene Spitz's pioneering study which showed what catastrophic effects sensory and social deprivation at certain critical periods in early childhood can have on children's subsequent development

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