Gaze behaviour when monitoring pain faces: An eye-tracking study

BackgroundThe vigilance-(attentional) avoidance hypothesis (VAH) developed for explaining phobic reactions describes an early attentional bias towards a feared stimulus followed by attentional avoidance of this stimulus. Such a pattern of attentional shifts might also be found when processing of pain-related stimuli is required. The purpose of the present study was to test the VAH for pain-associated stimuli, i.e., faces displaying pain, using the method of eye-tracking in a pain-free sample. MethodsForty-eight healthy participants observed pictures of faces displaying pain and other emotions (anger, joy), presented concurrently with neutral faces, while their gaze behaviours were recorded continuously. ResultsAnalysis of the time course of fixation durations revealed a distinct pattern for pain faces. Participants gazed at pain faces longer than at neutral faces at the beginning (up to 1000ms) but reduced preference for pain faces increasingly thereafter (up to 2000ms); this decline in vigilance did not occur for anger and joy faces. Strong fear of pain (Fear of Pain Questionnaire) tended to increase attentional preference for negative faces (pain, anger), a finding, which however did not reach significance. ConclusionsWe assume that initial vigilance for pain-associated stimuli might reflect an adaptive reaction to detect a potentially harmful stimulus. Subsequently, the pain-associated stimulus might be less attended for the purpose of mood regulation when all clear is given in this situation.