Correlation: novelty-seeking, anxiety-related behavior, and immobility. Duration of immobility during acquisition, extinction, and recovery, in relation to novelty-seeking in the activity box (A–A’’) and anxiety-like behavior in the elevated plus maze (B–B’’). Depicted are SERT+/+ (black diamond), SERT+/− (black-white diamond), and SERT−/− (white diamond) rats. N = 29 SERT+/+ (15 female, 14 male), 30 SERT+/− (15 female, 15 male), 28 SERT−/− (14 female, 14 male) rats, except activity box (see materials and methods for details). Data are presented as individual values and correlation coefficients. Statistical significance (p < 0.05) of correlation coefficient is indicated in bold and italic.