Fig. 2From: Cerebral and neural regulation of cardiovascular activity during mental stressGrand-mean results (n = 34) of time–frequency related PS of RRI (MWT based). a The normalized LF, b HF, c the sympathetic-vagal balance(LF/HF). The nLF is shown by percentage. The baseline is depicted with dotted line and the MA is depicted with solid line Back to article page