TY - JOUR
AU1 - Luciano, M.
AU2 - Wright, M.
AU3 - Smith, G.
AU4 - Geffen, G.
AU5 - Geffen, L.
AU6 - Martin, N.
AB - The genetic relationship between lower (information processing speed), intermediate (working memory), and higher levels (complex cognitive processes as indexed by IQ) of mental ability was studied in a classical twin design comprising 166 monozygotic and 190 dizygotic twin pairs. Processing speed was measured by a choice reaction time (RT) task (2-, 4-, and 8-choice), working memory by a visual-spatial delayed response task, and IQ by the Multidimensional Aptitude Battery. Multivariate analysis, adjusted for test-retest reliability, showed the presence of a genetic factor influencing all variables and a genetic factor influencing 4- and 8-choice RTs, working memory, and IQ. There were also genetic factors specific to 8-choice RT, working memory, and IQ. The results confirmed a strong relationship between choice RT and IQ (phenotypic correlations: −0.31 to −0.53 in females, −0.32 to −0.56 in males; genotypic correlations: −0.45 to −0.70) and a weaker but significant association between working memory and IQ (phenotypic: 0.26 in females, 0.13 in males; genotypic: 0.34). A significant part of the genetic variance (43%) in IQ was not related to either choice RT or delayed response performance, and may represent higher order cognitive processes.
TI - Genetic Covariance Among Measures of Information Processing Speed, Working Memory, and IQ
JF - Behavior Genetics
DO - 10.1023/A:1013397428612
DA - 2004-10-23
UR - https://www.deepdyve.com/lp/springer-journals/genetic-covariance-among-measures-of-information-processing-speed-CdyGSoXuS5
SP - 581
EP - 592
VL - 31
IS - 6
DP - DeepDyve
ER -