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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

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More quotes by Harry Harlow

Because that's how it feels when you're depressed.

In our study of psychopathology, we began as sadists trying to produce abnormality. Today, we are psychiatrists trying to achieve normality and equanimity.

The little we know about love does not transcend simple observation, and the little we write about it has been written better by poets and novelists.

In the first place I have an enormous regard for common sense. Any time we discover some great thing and it contradicts common sense, we better go back to the laboratory and check it.

Not even in our most devious dreams could we have designed a surrogate as evil as these real monkey mothers were.

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Quote text and notes from Wikiquote: Harry Harlow (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.