There is evidence that virtual reality (VR) pain distraction is effective at improving pain-related outcomes. However, more research is needed to investigate VR environments with other pain-related goals. The main aim of this study was to compare the differential effects of two VR environments on a set of pain-related and cognitive variables during a cold pressor experiment. One of these environments aimed to distract attention away from pain (VRD), whereas the other was designed to enhance pain control (VRC). Participants were 77 psychology students, who were randomly assigned to one of the following three conditions during the cold pressor experiment: (a) VRD, (b) VRC, or (c) Non-VR (control condition). Data were collected regarding both pain-related variables (intensity, tolerance, threshold, time perception, and pain sensitivity range) and cognitive variables (self-efficacy and catastrophizing). Results showed that in comparison with the control condition, the VRC intervention significantly increased pain tolerance, the pain sensitivity range, and the degree of time underestimation. It also increased self-efficacy in tolerating pain and led to a reduction in reported helplessness. The VRD intervention significantly increased the pain threshold and pain tolerance in comparison with the control condition, but it did not affect any of the cognitive variables. Overall, the intervention designed to enhance control seems to have a greater effect on the cognitive variables assessed. Although these results need to be replicated in further studies, the findings suggest that the VRC intervention has considerable potential in terms of increasing self-efficacy and modifying the negative thoughts that commonly accompany pain problems.

These results provide preliminary support for the use of our VR intervention to gain control over pain.

IntroductionCognitive strategies have received considerable attention in the field of pain management, together with more traditional approaches based on physical interventions and behavior modification. Distraction is a technique that lately has been often studied.Distraction is based on an individual's limited attention capacity; it diminishes attention aimed to a painful stimulus with a subsequent pain reduction (Wismeijer & Vingerhoets, 2005).ObjectiveTo study the effect of VR as a distraction technique in an experimental pain task.Method37 healthy participants were induced pain through two consecutive immersions using the cold-pressor test. All participants went through two experimental conditions: VR and black screen. The order of conditions was counterbalanced and a design of repetitive measures was used.A virtual environment “Surreal World” was developed based on distraction techniques designed to surprise participants. The effect of VR as a distraction technique was evaluated using objective measures of pain (threshold, tolerance, pain intensity and time estimation) and other cognitive measures (self-efficacy and catastrophic thinking in vivo).ResultsVR significantly decreased tolerance and pain intensity, influenced participants to underestimate the length of immersion. A higher self-efficacy in VR and a lower rumination and helplessness were registered in the pain experience. Thus, VR may help improve the efficacy of cognitive strategies.PerspectivesThe study shows the relevance of VR as an adjunctive method in the treatment of acute pain and allows studying its efficacy in patients with chronic pain.

IntroductionAttention plays an important rol in pain perception. Focusing attention in pain intensifies the painful experience whereas distraction may decrease its subjective sensation (Eccleston & Crombez, 1999).The purpose of the two studies is to establish the efficacy of distraction by means of VR in the control and reduction of pain using the cold-pressor test. In both studies threshold, tolerance, perceived pain intensity and time estimation were measured.Study 137 healthy participants were induced pain in two consecutive immersions using the cold-pressor test. The experiment was counterbalanced and all participants went through two experimental conditions: VR (stereoscopic screen) and black screen. A virtual environment “Surreal World” was designed based on distraction of attention techniques. Results showed that VR significantly increased threshold and tolerance, diminished pain intensity and perception of time.Study 235 healthy participants underwent two consecutive immersions using cold pressor: VR (using the updated version of Surreal World and 3D laptops) and black screen. VR significantly increased the threshold and tolerance, whereas variations in the estimation of time were barely significant.Differences in the results of the two studies could be accounted for by the immersive effect of the stereoscopic screen. Findings are discussed in relation to previous studies on VR and pain. Results support VR as an adjunctive method in pain treatment and allow proving its efficacy in patients with chronic pain.