Purpose/Objective: The objective of the study was to examine the BIS-BAS model of chronic pain. This model posits that 2 neurophysiological systems-the behavioral inhibition system (BIS) sensitized to and activated by punishment cues and the behavioral activation system (BAS) sensitized to and activated by reward cues-make independent and concurrent contributions to 2 domains of pain-related function: pain interference and positive function despite pain. The study additionally hypothesized that BIS and BAS sensitivity would have different associations with these 2 different aspects of pain-related function. BIS activation would be more strongly correlated with pain interference and BAS would be more strongly correlated with positive function despite pain. Research Method/Design: This was a cohort study consisting of the baseline assessments of 328 veterans enrolled in a large clinical trial examining 3 psychosocial interventions for chronic pain. Results: In multivariable regression adjusting for demographic factors and pain intensity, BIS was associated with greater pain interference and less positive function despite pain. BAS was associated with greater positive function despite pain but to a lesser degree than BIS. Conclusions: As hypothesized, BIS and BAS both contributed to pain-related function; however, BIS displayed stronger associations with both pain interference and positive function despite pain. Thus, the hypothesis that BIS-BAS relationships would differ based on the nature of the functional outcome (BIS resulting in poorer function because of pain and BAS better function despite pain) was only partially supported. Findings of the current study suggest the role of BIS in chronic pain may be more pervasive across functional outcomes.
Impact and ImplicationsThis study provides support for the BIS-BAS model of chronic pain and suggests that behavioral inhibition and behavioral activation systems may make important, and unique, contributions to the functional impact of chronic pain. Results have practical implications for the development of pain-related treatments and the matching of specific treatment components to individual patient characteristics. Understanding the mutually reinforcing interaction of behaviors, cognitions, and emotions associated with each BIS and BAS system could result in interventions with treatment targets that are more specific, efficient, and ultimately effective.