Keeping an eye on pain: investigating visual attention biases in individuals with chronic pain using eye-tracking methodology

Samantha R Fashler, Joel Katz Department of Psychology, York University, Toronto, Ontario, Canada Abstract: Attentional biases to painful stimuli are evident in individuals with chronic pain, although the directional tendency of these biases (ie, toward or away from threat-related stimuli) remains unclear. This study used eye-tracking technology, a measure of visual attention, to evaluate the attentional patterns of individuals with and without chronic pain during exposure to injury-related and neutral pictures. Individuals with (N=51) and without chronic pain (N=62) completed a dot-probe task using injury-related and neutral pictures while their eye movements were recorded. Mixed-design analysis of variance evaluated the interaction between group (chronic pain, pain-free) and picture type (injury-related, neutral). Reaction time results showed that regardless of chronic pain status, participants responded faster to trials with neutral stimuli in comparison to trials that included injury-related pictures. Eye-tracking measures showed within-group differences whereby injury-related pictures received more frequent fixations and visits, as well as longer average visit durations. Between-group differences showed that individuals with chronic pain had fewer fixations and shorter average visit durations for all stimuli. An examination of how biases change over the time-course of stimulus presentation showed that during the late phase of attention, individuals with chronic pain had longer average gaze durations on injury pictures relative to pain-free individuals. The results show the advantage of incorporating eye-tracking methodology when examining attentional biases, and suggest future avenues of research. Keywords: attentional biases, chronic pain, avoidance, hypervigilance, dot prob

Sensitivity to Pain Traumatization Scale: development, validation, and preliminary findings

Joel Katz,1,2 Samantha R Fashler,1 Claire Wicks,1 M Gabrielle Pagé,3 Kaley M Roosen,1 Valery Kleiman,1 Hance Clarke2 1Department of Psychology, York University, 2Department of Anesthesia and Pain Management, Toronto General Hospital, Toronto, ON, 3Centre de recherche du Centre hospitalier de l’Université de Montréal (CRCHUM), Montreal, QC, Canada Background: This article reports three studies describing the development and validation of the 12-item Sensitivity to Pain Traumatization Scale (SPTS-12). SPT refers to the anxiety-related cognitive, emotional, and behavioral reactions to pain that resemble the features of a traumatic stress reaction.Methods: In Study 1, a preliminary set of 79 items was administered to 116 participants. The data were analyzed by using combined nonparametric and parametric item response theory resulting in a 12-item scale with a one-factor structure and good preliminary psychometric properties. Studies 2 and 3 assessed the factor structure and psychometric properties of the SPTS-12 in a community sample of 823 participants (268 with chronic pain and 555 pain-free) and a clinical sample of 345 patients (126 with chronic post-surgical pain, 92 with other nonsurgical chronic pain, and 127 with no chronic pain) at least 6 months after undergoing coronary artery bypass graft surgery, respectively. Results: The final SPTS-12 derived from Study 1 comprised 12 items that discriminated between individuals with different levels of SPT, with the overall scale showing good to very good reliability and validity. The results from Studies 2 and 3 revealed a one-factor structure for chronic pain and pain-free samples, excellent reliability and concurrent validity, and moderate convergent and discriminant validity. Conclusion: The results of the three studies provide preliminary evidence for the validity and reliability of the SPTS-12. Keywords: chronic pain, chronic post-surgical pain, trauma, psychology, scale development, measurement, item response theory analysis, factor analysi

The Toronto General Hospital Transitional Pain Service: development and implementation of a multidisciplinary program to prevent chronic postsurgical pain

Joel Katz,1–3 Aliza Weinrib,1,2 Samantha R Fashler,2 Rita Katznelzon,1,3 Bansi R Shah,1 Salima SJ Ladak,1 Jiao Jiang,1 Qing Li,1 Kayla McMillan,1 Daniel Santa Mina,5,6 Kirsten Wentlandt,7 Karen McRae,1,3 Diana Tamir,1,3 Sheldon Lyn,1,3 Marc de Perrot,8 Vivek Rao,9 David Grant,10 Graham Roche-Nagle,11 Sean P Cleary,12 Stefan OP Hofer,13 Ralph Gilbert,14 Duminda Wijeysundera,1,3 Paul Ritvo,15 Tahir Janmohamed,16 Gerald O’Leary,1,3 Hance Clarke1,3 1Department of Anesthesia and Pain Management, Toronto General Hospital, University Health Network, University of Toronto, 2Department of Psychology, York University, 3Department of Anesthesia, University of Toronto, 4Palliative Care, University Health Network, University of Toronto, 5Princess Margaret Cancer Centre, University Health Network, University of Toronto, 6Faculty of Kinesiology and Physical Education, University of Toronto, 7Department of Family and Community Medicine, University of Toronto, 8Division of Thoracic Surgery, Toronto General Hospital, 9Division of Cardiovascular Surgery, Toronto General Hospital, 10Multiorgan Transplant Program, Toronto General Hospital, 11Division of Vascular Surgery, Toronto General Hospital, 12Division of General Surgery, Toronto General Hospital, 13Division of Plastic Surgery, Toronto General Hospital, 14Division of Otolaryngology – Head and Neck Surgery, Toronto General Hospital, 15Department of Kinesiology and Health Science, York University, 16ManagingLife, Toronto, ON, CanadaAbstract: Chronic postsurgical pain (CPSP), an often unanticipated result of necessary and even life-saving procedures, develops in 5–10% of patients one-year after major surgery. Substantial advances have been made in identifying patients at elevated risk of developing CPSP based on perioperative pain, opioid use, and negative affect, including depression, anxiety, pain catastrophizing, and posttraumatic stress disorder-like symptoms. The Transitional Pain Service (TPS) at Toronto General Hospital (TGH) is the first to comprehensively address the problem of CPSP at three stages: 1) preoperatively, 2) postoperatively in hospital, and 3) postoperatively in an outpatient setting for up to 6 months after surgery. Patients at high risk for CPSP are identified early and offered coordinated and comprehensive care by the multidisciplinary team consisting of pain physicians, advanced practice nurses, psychologists, and physiotherapists. Access to expert intervention through the Transitional Pain Service bypasses typically long wait times for surgical patients to be referred and seen in chronic pain clinics. This affords the opportunity to impact patients' pain trajectories, preventing the transition from acute to chronic pain, and reducing suffering, disability, and health care costs. In this report, we describe the workings of the Transitional Pain Service at Toronto General Hospital, including the clinical algorithm used to identify patients, and clinical services offered to patients as they transition through the stages of surgical recovery. We describe the role of the psychological treatment, which draws on innovations in Acceptance and Commitment Therapy that allow for brief and effective behavioral interventions to be applied transdiagnostically and preventatively. Finally, we describe our vision for future growth. Keywords: Transitional Pain Service, chronic postsurgical pain, transition to chronic pain, opioid use, multidisciplinary treatmen

What does your gaze reveal about you? On the privacy implications of eye tracking

Technologies to measure gaze direction and pupil reactivity have become efficient, cheap, and compact and are finding increasing use in many fields, including gaming, marketing, driver safety, military, and healthcare. Besides offering numerous useful applications, the rapidly expanding technology raises serious privacy concerns. Through the lens of advanced data analytics, gaze patterns can reveal much more information than a user wishes and expects to give away. Drawing from a broad range of scientific disciplines, this paper provides a structured overview of personal data that can be inferred from recorded eye activities. Our analysis of the literature shows that eye tracking data may implicitly contain information about a user's biometric identity, gender, age, ethnicity, body weight, personality traits, drug consumption habits, emotional state, skills and abilities, fears, interests, and sexual preferences. Certain eye tracking measures may even reveal specific cognitive processes and can be used to diagnose various physical and mental health conditions. By portraying the richness and sensitivity of gaze data, this paper provides an important basis for consumer education, privacy impact assessments, and further research into the societal implications of eye tracking