 However, it was found that CON2's effects on IQ remained substantial even after eliminating bilateral temporal surface area, right frontal lobe surface area and total grey matter volume as factors.A portion of CON2's association with IQ, however, was through its effects on bilateral temporal surface area.Notably, this contribution to IQ was larger than that of its effects on right frontal lobe surface area, despite the fact that it increased this area the most.