“The effects of 6 months of total social isolation were so devastating and debilitating that we had assumed initially that 12 months of isolation would not produce any additional decrement. This assumption proved to be false; 12 months of isolation almost obliterated the animals socially.”

—  Harry Harlow

"Total social isolation in monkeys," from the Proceedings of the National Academy of Science of the United States of America, 1965.

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Harry Harlow 9
American psychologist 1905–1981

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