Instructed faking of the HEXACO reduces facet reliability and involves more Gc than Gf

Research on the role of intelligence in the capacity to fake personality tests tends to use the Big Five and g-factor models of personality and intelligence. The current study (N = 185 university students) examines instructed faking on the HEXACO and separately considers the role of fluid intelligence (Gf) and crystallized intelligence (Gc). Results demonstrate that: (a) participants can fake the HEXACO domains and facets to about the same extent as the Big Five; (b) faking has little effect on domain reliability but reduces facet reliability; and (c) faking involves Gc to a much greater degree than Gf. Results are discussed in terms of practical applications of facet scores, and process models of faking.