Figure 5.

Controls for the multiple association learning assay. Replacing the second training trial by either the aversive mechanical shock stimulus only (grey bars) or a second odour-pairing alone (white bars) did not affect the performance on the first training for both rover and sitter strains (treatment, for^s2: F_2,32 = 0.11, p = 0.89; for^s: F_2,32 = 0.55, p = 0.58; for^R: F_2,32 = 0.29, p = 0.75). Error bars represent ±s.e.m. (n = 12 for each bar; black bars, control; grey bars, shock only; white bars, odour only).