The wire mother experiment

giving two rhesus monkeys a choice between two mothers

They removed monkeys from their mothers hours after birth.

Fear, security and attachment.

Put monkeys in a room with or without surrogate mother and monitored behaviour.

Monkeys with the mother would use her as a base, when mothers removed monkeys would freeze up, crouch , rock , scream and  cry.

Showed love Is vital for child development.

The study involved observing children between the ages of 12-18 months responding to a situation in which they were left alone and then reunited with their mother. Based on these observations, Ainsworth concluded that there were three major styles of attachment: secure, ambivalent-insecure, and avoidant-insecure. (source: http://psychology.about.com/od/loveandattraction/ss/attachmentstyle2.htm   

Young children separated from their mothers experience a range of emotions including sadness and aggression

The provision of a positive caring environment can mitigatealmost all adverse reactions to separation

Rutter argued against Bowlby's theory any saying that it was normal for children to form multiple attachments rather than just a selective attachment with just one person.

He did not believe in Bowlby's theory that early experiences affected later life. Rutter found that adopted children could bond with their adopted parents even if they are adopted in the early initial month after birth.

He set up the social, genetic and developmental psychiatric unit which links together 'nature' (genetics) and 'nurture' (environment) as they interact with the development of complex human behaviour (e.g. depression).