Now we will how environmental factors result in individual difiérences. We know that the environment of a child aliécts his upbnnging and Howewer we need to understand that environment does not simply objects child. psychologically. it objects which as stimuli and directly affect a Child'S physical and mental growth While growing up. Thus t wo Children born in the same iämily may have very different environment depending on treatment and expectations ot- parent, Studies have shown that even pre-natal environment which includes diet the mother hxs taken her mental status etc. influence the development 01 child in mother's womb. Environment and Individual Differences Several studies and experiments have been done to find out how environment causes individual differences. Among these. the studies done on identical twins are most significant. This is because in case of identical twins genetic factors are ruled out because both the twins get same set or genes from the parents. Research by Newman, Freeman and Holzinger ( 1937) on identical twins brought up