Fig. 2. Successful task completion when stimuli are paired or presented alone.

(A) Success at 45°C is not significantly increased by pairing with non-noxious cold stimuli as compared to when it is presented alone (n = 29; F _{3, 62} = 2.457, p = 0.103). (B) Success ratios at the cold stimuli (10, 18, 24°C) are significantly decreased when paired with 45°C (10°C: t₅₁ = 12.264, for single stimulus, n = 41; 18°C: t₁₇ = 6.633, n = 12; 24°C: t₂₂ = 3.866, n = 14). (C) Success ratio at 48°C is significantly reduced when paired with −4 and 10°C, but not significantly different when paired with 18 or 24°C as compared to when it is presented alone (n = 28). (D) Success ratio is significantly decreased at −4 and 10°C when paired with 48°C (−4°C t₁₃ = 2.708; 10°C: t₁₀₅ = 2.706), significantly increased at 18°C (t₁₁ = −2.486), and not significantly increased at 24°C (t₉ = −1.46). * indicates p<0.05 for success alone versus paired, (for success ratios with hot stimuli significance was determined by ANOVA and Tukey's test post-hoc, and by t tests for success ratios with cold stimuli). All data are mean ± SEM.