Fig. (1) Mean +/- SEM of subjective stress ratings are presented. Compared to neutral pictures all tasks induced more stress.neutr: neutral affective pictures; pos: positive affective pictures;sing: singing task; neg: negative affective pictures; CWT: Color-Word interference test; talk: hold a talk; calc: mental arithmetic;*: p < 0.05 vs neutr; **: p < 0.01 vs neutr.