Harlow followed the monkeys into adult hood to see if the effects of not having a real mother, being maternally deprived had any permanent effects. The researchers found sever consequences. The monkeys reared by only the wire mother were the most dysfunctional even those reared with the cloth mother did not develop normal social behaviour. They were more aggressive less sociable and bred less often than other monkeys (as they were unskilled at mating). As mothers the deprived monkeys neglected their children and sometimes attacked their children even killing them