“…Vartanian and Goel (2004) included 10 women and 2 men, Kawabata and Zeki (2004) included 5 men and 5 women, while Cela-Conde et al (2004) included 8 women. This seems to be a relevant issue, in the light of studies that have found gender differences in aesthetic preference (Bernard, 1972;Burges Cruz, 2000;Eysenck and Castle, 1971;Furnham and Walker, 2001;Johnson and Knapp, 1963;Neperud, 1986;Polzella, 2000), and the increasing evidence of sex differences in the neural correlates of several cognitive (Bell et al, 2006;Boghi et al, 2006;Georgopoulos et al, 2001;Haier et al, 2006) and affective tasks (Azim et al, 2005;Kemp et al, 2004;Mackiewicz et al, 2006;Piefke et al, 2005;Tranel et al, 2005). Thus, it is not known how confounding it is to jointly analyze men and women's results, or how limiting it is to only include participants from one of the sexes.…”