“…It is worth noting that the g -factor, despite being touted as the “holy grail” of human abilities (see McGrew 2009 ), may fail to meet such expectations in the context of the studies included in this review. For example, in the study by Rowe ( 2019 ), 85 participants completed the ICAR-16, an IQ test containing four subtests (matrix reasoning, letter-number reasoning, verbal reasoning, and 3D rotation), and established as a part of a broader open-science project by the International Cognitive Ability Resource (ICAR) team (Condon and Revelle 2014 ; Dworak et al 2020 ). The resulting single-factor model (i.e., the g -factor model) obtained from the CFA displayed excellent model fit ( χ 2 (2) = 0.932, CFI = 1.0, TLI = 1.11, RMSEA = .00, p = .628) and yet the AVE was 30% which, as is the case with the AVE values obtained from the c -factor analyses in Table 2 , falls well below the 50% recommended cutoff.…”