A pilot study on changes of cardiac vagal tone in individuals with low trait positive affect: The effect of positive psychotherapy

The association between changes of trait affect and changes of vagal tone was investigated in the present study. Basal physiological data were collected from 70 college students of high (n = 33) and low trait positive affect (n = 37) (HPA vs. LPA) groups selected by Positive and Negative Affect Schedule (PANAS). Then the final LPA participants (n = 34) were randomly assigned to either a four month Positive Psychotherapy (PPT) group (n = 16) or a...