Heart Rate Variability Modulates Task Performance on Identifying Negative Words Superimposed on Racially in-Group Faces.

We presented positive or negative words superimposed on either racially out-group or in-group faces. White participants were less accurate in trials where negative words were superimposed on in-group faces. However, people with higher cardiac vagal tone were more accurate in trials where negative words were superimposed on in-group faces.