Table 1.

Explanation of each of the measures calculated from the breathing-related interoception task and the two attention tasks.

Term	Explanation
Filter detection task:
Number of filters (sensitivity)	The number of filters required for a participant to detect the presence of a resistance with 70% accuracy
Decision bias	A propensity to answer ‘yes’ (resistance present) or ‘no’ (no resistance present
Average confidence	Average confidence in perceptual decisions (i.e. metacognitive bias)
Metacognitive sensitivity (logMratio)	Correspondence between confidence scores and perceptual accuracy
Attention network task:
Alerting score	The effect of the presence of an attention cue on changes in reaction time
Orienting score	The effect of a spatially-orienting cue on changes in reaction time
Executive score	The effect of incongruent cues (compared to congruent cues) on changes in reaction time
Visual Dot Probe Task:
Breathlessness interference score	The effect of threatening asthma words compared to neutral asthma words on reaction time