In the 1950s, [ Select ] conducted a series of experiments on monkeys. He [ Select ] newborn monkeys from their [ Select ] . Each monkey was presented with [ Select ] surrogate mothers. One surrogate monkey was made out of [ Select ] mesh, and she could dispense milk. The other monkey was softer and made from [ Select ] : This monkey did not dispense milk. Research shows that the monkeys preferred the soft, cuddly cloth monkey, even though she did not provide any [ Select ]