The nature of love

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During the first half of the 20th century, many psychologists believed that showing affection towards children was merely a sentimental gesture that served no real purpose. Behaviorist John B. Watson once even went so far as to warn parents, "When you are tempted to pet your child, remember that mother love is a dangerous instrument." According to many thinkers of the day, affection would only spread diseases and lead to adult psychological problems. During this time, psychologists were motivated to prove their field as a rigorous science. The behaviorist movement dominated psychology and urged researchers to study only observable and measurable behaviors. An American psychologist named Harry Harlow, however, became interested in studying a topic that was not so easy to quantify and ...