(261) Does Anger Inhibition Alter Pain Modulation?

The tendency to inhibit anger (anger-in) is associated with increased pain. This relationship may be explained by the negative affectivity hypothesis such that those with high anger-in experience increased negative affectivity and thus increased pain (because negative affect enhances pain). Alternatively, this relationship may be explained by the cognitive resource hypothesis such that anger-in limits attentional resources normally available for pain modulation. The present study examined these competing hypotheses in healthy, pain-free participants using a well-validated picture viewing paradigm (ie, Emotional Controls of Nociception, ECON). ECON is a paradigm in which painful, electrocutaneous stimulations are delivered during and in between pictures of emotional content (mutilation, neutral, and erotica). Pain ratings were assessed in response to electric stimuli. This allows for the assessment of emotional modulation of pain by comparing pain evoked during mutilation and erotic pictures to pain evoked during neutral pictures. Additionally, ECON allows for the assessment of attentional modulation of pain by comparing pain evoked during neutral pictures (distraction) to pain evoked in the absence of pictures (control). Prior to ECON, participants filled out the Anger Expression Inventory to assess their tendency to inhibit anger and 2 groups were formed (high anger-in, N = 71 and low anger-in, N = 27) from their responses (ie, +/- 1SD from the normative mean of anger-in). Results found that both groups demonstrated similar emotional modulation of pain. By contrast, persons in the low anger-in group displayed attentional modulation of pain, whereas persons in the high anger-in group failed to attentionally modulate pain. These findings suggest that cognitive resource deficits in high anger-in individuals may contribute to increased pain risk.