Author response image 1. Activation maps with and without including individual heart rate and respiratory volume as covariates in the 2^nd GLM.

(a) Main effect of interoceptive attention (interoceptive task vs. exteroceptive task). (b) Interaction between attention type and breath-curve feedback condition ([delayed – non-delayed]_{interoceptive task} – [delayed – non-delayed]_{exteroceptive task}).