▁five ▁different ▁domains ▁of ▁the ▁Five ▁F actor ▁Model . ▁The ▁volume ▁of ▁the ▁med ial ▁orbit of ront al ▁cor tex , ▁which ▁is ▁responsible ▁for ▁coding ▁reward ▁values , ▁was ▁posit ively ▁associated ▁with ▁Ext ra version . ▁Ne uro t ic ism ▁was ▁related ▁to ▁reduced ▁d ors omed ial ▁pre front al ▁cor tex ▁and ▁posterior ▁hi pp oc amp us ▁volume ▁and ▁increased ▁mid - cing ulate ▁g yrus ▁volume , ▁which ▁are ▁areas ▁sensitive ▁to ▁threat ▁and ▁pun ishment ▁and ▁associated ▁with ▁negative ▁em otion ▁and ▁emot ional ▁d ys reg ulation . ▁Red u ced ▁posterior ▁left ▁superior ▁temporal ▁sul cus ▁and ▁increased ▁posterior ▁c ing ulate ▁cor tex ▁and ▁fus iform ▁g yrus ▁volume ▁were ▁associated ▁with ▁Ag ree ab len ess ▁and ▁have ▁been ▁shown ▁to ▁be ▁involved ▁in ▁interpretation ▁of ▁others ' ▁mot ives ▁and ▁belief s . ▁In cre ased ▁volume ▁in ▁the ▁middle ▁front al ▁g yrus ▁in ▁the ▁left ▁later al ▁pre front al ▁cor tex , ▁an ▁area ▁responsible ▁for ▁maintain ing ▁and ▁executing ▁information ▁and ▁planned ▁action , ▁was ▁posit ively ▁correl ated ▁with ▁Cons cient ious ness . ▁Op enn ess / Int el lect ▁( Op enn ess ▁to ▁Exper ience ) ▁was ▁the ▁only ▁member ▁of ▁the ▁Big ▁Five ▁lack ing ▁a ▁significant ▁relationship ▁to ▁brain ▁structure ▁volume . ▁However , ▁other ▁research ▁by ▁De You ng ▁et ▁al . ▁( 2 0 0 9 ) ▁has ▁shown ▁that ▁Op enn ess / Int el