“…Early research on the behav ioral genetic origins of v ariation in humor focused on humor appreciation, w hich assessed the extent to w hich participants perceiv ed target material as being funny (Vernon, Martin, Schermer, Cherkas, & Spector, 2008a). Results from these studies indicated that indiv idual differences in humor Europe's Journal of Psychology 14 appreciation w ere primarily attributable to shared and non-shared env ironmental factors (e.g., Cherkas, Hochberg, MacGregor, Snieder, & Spector, 2000;Nias & Wilson, 1977;Wilson, Rust, & Kasriel, 1977). Later assessments of humor, how ev er, noted that the construct of humor appreciation, though legitimate, w as not related to one's ability to produce or to engage in humor, and w as therefore not a v alid representation of sense of humor or humor style (Köhler & Ruch, 1996).…”