The research by Margaret and Harry Harlow demonstrated a need for in young rhesus monkeys?

Harlow took newborn baby monkey from their mothers. He then gave them he option to be with a plastic cloth covered monkey, with a light bulb for heat or a cold wire monkey with a bottle of milk attached. They choose the warm, comforting monkey each time and only went to the wire monkey when they where hungry, returning to the cloth monkey straight after they have fed. This had bad socialisation affects on the monkeys, as they where brought up with no love or care, the monkeys became scared and confused.