un related ▁individuals . ▁This ▁study ▁provides ▁evidence ▁of ▁the ▁gen etic ▁influence ▁of ▁the ▁brain ▁structure ▁and ▁size , ▁which ▁are ▁believed ▁to ▁both ▁influence ▁intelligence ▁in ▁some ▁way . ▁ ▁Another ▁study ▁in ▁ 2 0 0 6 ▁exam ined ▁ 1 0 0 ▁post mort em ▁bra ins , ▁seeking ▁a ▁relationship ▁between ▁an ▁individual ’ s ▁Full ▁Sc ale ▁We chs ler ▁Ad ult ▁Int elligence ▁Sc ale ▁score ▁and ▁the ▁volume ▁of ▁their ▁brain ▁regions . ▁Prior ▁to ▁death , ▁the ▁subjects ▁had ▁completed ▁the ▁W A IS ▁test , ▁which ▁measures ▁ver bal ▁and ▁vis u osp atial ▁ab ilities . ▁The ▁factors ▁considered ▁important ▁to ▁the ▁relationship ▁between ▁brain ▁size ▁and ▁intelligence ▁were ▁age , ▁sex ▁and ▁hem is pher ic ▁functional ▁later al ization . ▁They ▁found ▁that ▁general ▁ver bal ▁ability ▁was ▁correl ated ▁with ▁c ere br al ▁volume ▁in ▁women ▁and ▁right - hand ed ▁men . ▁It ▁was ▁not ▁possible ▁to ▁find ▁a ▁relationship ▁between ▁ability ▁and ▁volume ▁in ▁with ▁every ▁group , ▁however . ▁ ▁Ne ural ▁condu ction ▁speed ▁N erve ▁condu ction ▁velocity ▁( N CV ) ▁has ▁been ▁studied , ▁giving ▁varying ▁results . ▁Some ▁have ▁hypoth es ized ▁that ▁" high er ▁intelligence ▁is ▁associated ▁with ▁better ▁' ne ural ▁efficiency .' " ▁A ▁few ▁studies ▁suggested ▁an ▁association ▁between ▁n erve ▁condu ction ▁velocity ▁and ▁scores ▁on ▁the ▁Mult id im ensional ▁A pt itude ▁B atter y ▁( MA B ). ▁However , ▁other