''Does nature or nurture form our psychological makeup ? ''
Both, an ancient Roman or Greek had much the same genetic makeup as a modern person but a different outlook on life and the world. A mistreated child is not psychologically the same as one who is shown love, etc.
There was a lot of experimentation on behavour and environment done with chimps in the sixties and seventies.
''Much of Harlow's scientific career was spent studying maternal bonding, what he described as the "nature of love". These experiments involved rearing newborn "total isolates" and monkeys with surrogate mothers, ranging from toweling-covered cones to a machine that modeled abusive mothers by assaulting the baby monkeys with cold air or spikes.[5] The point of the experiments was to pinpoint the basis of the mother-child relationship, namely whether the infant primarily sought food or affection. Harlow concluded it was the latter.''
