Fig. 3.

Brain activity for the retreat minus approach contrast. (A) An example of how approach/retreat was quantified. BOLD signal was taken from, for example, compartment three depending on whether the tarantula had moved forward or backward from a previous compartment. Independent of any distance effects, the (B) amygdala (14, −2, −16; P < 0.024, svc) and BNST (right, 12, 0, −4; P < 0.027, svc; left, −12, 4, −4; P < 0.014, svc) were differentially more active for approach versus retreat of the tarantula.