…complexity, distractor number, speed, and interobject distance have been shown to affect capacity (Alvarez & Franconeri, 2007; Bettencourt & Somers, 2009; Franconeri, Alvarez, & Enns, 2007; Horowitz et al., 2007; Tombu & Seiffert, 2011; Vogel et al., 2005; Xu & Chun, 2006; Zanto & Gazzaley, 2009).