The disastrous effects of six or twelve months of social isolation were so devastating and debilitating that we had assumed initially that twelve months of isolation would not produce any additional decrement. This assumption proved to be false.

Psychologists
Harry Harlow
U.S. psychologist (1905-81). His 1958 surrogate-mother work showed infant monkeys prefer contact comfort to feeding, grounding Bowlby's attachment theory. Later isolation studies helped spark U.S. animal liberation.
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Harry Harlow's Other Quotes
Love is a wondrous state, deep, tender, and rewarding. Because of its intimate and personal nature it is regarded by some as an improper topic for experimental research.
In our study of psychopathology, we began as sadists trying to produce abnormality. Today, we are psychiatrists trying to achieve normality and equanimity.
The only thing I care about is whether the monkeys will turn out a property I can publish. I don't have any love for them. Never have. I really don't like animals.
Contact comfort is a variable of overwhelming importance in the development of affectional responses, whereas lactation is a variable of negligible importance.