Fig. 1. Changes in FEV₁ from baseline values in suggestible and nonsuggestible subjects after the inhalation of saline as a sham bronchoconstrictor (A) and sham bronchodilator (B). C, Change in FEV₁ after the inhalation of saline as part of the methacholine test in suggestible (open circles) and nonsuggestible (open triangles) subjects.