Figure 2From: Dyspnea affective response: comparing COPD patients with healthy volunteers and laboratory model with activities of daily living Plot of ‘unpleasantness’ (A 1 ) as a function of air hunger intensity for two groups of subjects, COPD patients (open circles, dashed line) and healthy controls (closed circles, solid line). Both groups were exposed to moderate and high stimuli. There was no difference between the groups. The A1 scale of unpleasantness ranged from ‘neutral’ to ‘unbearable’; the air hunger scale ranged from zero (‘none’) to ‘as intense as I can imagine’.Back to article page