There is evidence that DHA plays a big role in the intellectual development of humans. In one study, doctors measured the DHA levels of mothers at the time they ＿＿（56）＿＿. Their children were then tested at 12 and 18 months of age to see how well they ＿＿（57）＿＿ things around them. The research team compiled data on ＿＿（58）＿＿ each child focused on a toy. The toddlers ＿＿（59）＿＿ mothers had the highest DHA levels at birth showed the greatest attention spans. These children focused for longer periods and spent much less time simply ＿＿（60）＿＿, unfocused.