Abstract
In evolutionary perspective, pleasant and unpleasant emotions designed to influence our behavior should be reflected in physiological responses. In this study, pleasant and unpleasant emotional s-IgA responses to olfactory stimuli were investigated. The results revealed that an increase in s-IgA concentration was induced by pleasant olfactory stimuli, while unpleasant olfactory stimuli did not change in s-IgA concentration. These data support the hypothesis that pleasant emotional state may enhance the beneficial effects on immune system. Therefore, s-IgA measurement could offer new insights for the understanding of emotional influence.
