Chapter 5 – Experimental fear 169 Extinction of nocebo hyperalgesia The mean magnitudes of nocebo responses at the end of extinction are presented in Table 2. Figures 5a and 5b illustrate the reduction of nocebo hyperalgesia and the residual magnitudes of nocebo responses at the end of extinction, respectively. Figure 6 displays the time-course of extinction for all three groups. High-pain group The analysis showed that there was no significant interaction between group (High-pain vs. Control) and time (nocebo magnitude at the start vs. at the end of extinction) (F (1,46) = 0.58, P = 0.45, ηp 2 = 0.01). High-threat group The analysis showed that there was no significant interaction between groups (High-threat vs. Control) and time (nocebo magnitude at the start vs. at the end of extinction), (F (1,46) = 0.04, P = 0.84, ηp 2 = 0.001) (5a).
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