Chapter 4 – Experimental learning 129 Table 2. Group means and standard deviations for the magnitude of nocebo responses after induction and attenuation, as well as for the reduction of nocebo hyperalgesia after attenuation. Phase 1 Phase 2 Induction group Nocebo magnitude Attenuation group Nocebo magnitude Nocebo reduction Induction - Attenuation group Nocebo magnitude Nocebo reduction Mean SD Mean SD Mean SD Mean SD Mean SD PRF 0.9 1.0 CC -0.6 1.2 1.8 1.7 PRF - CC -0.2 1.1 1.2 1.8 PRF PRF - Ext 0.3 0.6 0.6 1.0 CRF 1.5 1.1 Extinction 0.3 0.6 0.9 1.1 CRF - CC -1.0 1.2 2.3 1.6 CRF CRF - Ext 0.3 0.6 1.3 1.1 Sham -0.02 0.2 Note: Scores are reported on a 0-10 pain numeric rating scale.
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