This equalization was done because a great body of research indicated that differences in intelligence; emotional intelligence ; and personality factors are reflected in brain activity. The respondents were selected from a sample of 1225 individuals who were tested with the WAIS-R, MSCEIT and BFQ tests. From this group, 233 individuals (152 females and 81 males) with an average score on all three tests (±.5 SD), were selected and randomly allocated to the four groups.