The video discusses the experiments conducted by Harry Harlow, a psychologist who studied the emotional behavior of monkeys in the 1960s. Harlow separated baby monkeys from their mothers and placed them in cages with two dolls- one made of wire with milk, and the other covered with fabric but without any food. He wanted to study if the baby monkeys would prefer the doll covered in fabric or the one with the bottle. The results showed the baby monkeys preferred the soft toy with no milk, showing they valued comfort over sustenance, and would cling to it even when starving. However, Harlow's methods were considered unethical as the monkeys suffered from extreme separation and were subjected to sexual violations by a machine he created.