Event related potential correlates of intelligence

EEG was recorded at Fz, Cz and Pz while 35 participants either listened passively totones or completed an oddball task. Significant positive and negative correlations were foundbetween the ERP string length measure and WAIS-R Performance IQ and Verbal IQ. The mostimportant factors influencing the sign and magnitude of string length by IQ correlations were theexperimental task and the region of the ERP trace used for calculating string length. Othercontributing factors were the electrode site and whether or not the ERP trace was scaled beforecalculating string length. The formula used to calculate string length had little effect. Significantnegative correlations were found between the ERP variance measure and WAIS-R Verbal IQ andFull Scale IQ.