“…Notably, studies of personality in humans and chimpanzees ( Pan troglodytes ), who shared a common ancestor approximately six million years age (Glazko & Nei, 2003), have demonstrated that this period of time is long enough for differences in how personality traits are organized into dimensions to emerge (King & Figueredo, 1997). Human personality structure is largely seen to consist of five broad, universal dimensions labeled Neuroticism, Extraversion, Openness to Experience, Agreeableness, and Conscientiousness (Digman, 1990; McCrae, Terracciano, & 78 Members of the Personality Profiles of Cultures Project, 2005; Schmitt et al, 2007), though this view is not shared by all researchers (see, e.g., Gurven, von Rueden, Massenkoff, Kaplan, & Lero Vie, 2013; Saucier et al, 2013). Chimpanzee personality, on the other hand, is organized around five similar dimensions plus a sixth dimension, Dominance, that reflects a combination of assertiveness, low fear, competence, and intelligence (King & Figueredo, 1997).…”