Fig. 5.

Effects of trait sensitivity to positive feedback on motivational, hedonic and affective correlates of depressive symptoms in rats. a Appetitive motivation of animals classified as insensitive (open bars) and sensitive (filled bars) to positive feedback expressed as a break point in the progressive ratio schedule of reinforcement (PRSR) paradigm. b Hedonic status expressed as preference to sweet sucrose solution in the sucrose preference (SP) test. c Horizontal activity expressed by distance travelled in the open field (OF) test. d, e Vertical activities in the OF test expressed as the duration and number of rearings, respectively. f, g The level of anxiety measured in the LDB test and expressed by the latency to leave the safe/dark zone and proportion of time spent in the light zone, respectively. Data are presented as the mean ± SEM. N = 10 rats per group