Figure 3. Mean pain-expectancy judgments for the CS+ and CS− both for the pain-free control group (n = 30) and persistent neck pain group (n = 30) during the familiarization phase (FAM), the four blocks of acquisition (ACQ1-4), and the five blocks of extinction (EXT1-5), separately per block.

Vertical bars represent 95% confidence intervals. CS+, conditioned stimulus paired with “PAIN” in 75% of the trials; CS−, conditioned stimulus always paired with “NO PAIN”.