Fig. 6.

Effects of amphetamine on the performance of TDRT in socials and isolates (intra-group comparisons). a Isolates had a compressed sensitivity range than socials to amphetamine in the choice preference to delay but large reward (upper panels). b Nose poke during delay reductions were more evident in isolates at higher dose of amphetamine (lower panels). The vertical bar represents the standard error for the difference between means (SED) taken from the error terms for the interaction between factors. See legend of Fig. 1 for detail