Volitional vasomotor lability and vasomotor control.

This experiment tested the hypothesis that skin temperature variability during instructions to attempt skin temperature self-control without feedback (volitional vasomotor lability) predicts the acquisition of vasomotor control through biofeedback training. Skin temperature was recorded from the hands of 232 volunteers during a screening session. Twenty-three labile and 17 stabile subjects were chosen to participate in a 16-session training program under double blind conditions. Visual and auditory feedback were used to train subjects to produce temperature differences between the two hands in a specified direction. Comparisons between the labile and stabile groups revealed statistically significant differences in the predicted direction on measures of performance and learning. These findings provide preliminary support for the hypothesized positive relationship between volitional temperature variability and voluntary vasomotor control. Fruitful directions for future research are suggested.