Bars represent the mean for (A) coo vocalizations, (B) freezing, (C) hostile, and (D) motorstereotypies during the Alone, Profile, and Stare conditions for animals with wild-type controls (open bars & open shapes represent individuals) and HD monkeys (black bars & grey shapes represent individuals). Coo vocalizations and hostile behavior expression was transformed (LN x + 1) for data analysis, and nontransformed data are graphed. * indicates significant group differences (p < 0.05).