(A) Mean levels of resting baseline physiology are shown for each of the diagnostic groups. (B) Multiple regression analyses (controlling for age, sex, and diagnosis) found that lower baseline RSA was associated lower consolation and greater disengagement and that faster baseline respiration rates were associated with greater empathic concern as well as greater disengagement and impatience (scatters not shown). AD= Alzheimer’s disease, bvFTD= behavioral variant frontotemporal dementia, HC= healthy controls, lnRSA= natural log of respiratory sinus arrhythmia, RSA= respiratory sinus arrhythmia, SCL= skin conductance level.