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Virtual Reality TherapyPost-Traumatic Stress Disorder (PTSD) is reported to be caused by traumatic events that are outside the range of usual human experiences including (but not limited to) military combat, violent personal assault, being kidnapped or taken hostage and terrorist attacks. Initial data suggests that 1 out of 6 Iraq War veterans are exhibiting symptoms of depression, anxiety and PTSD.

Virtual Reality (VR) exposure treatment has been used in previous treatments of PTSD patients with reports of positive outcomes. The aim of the current paper is to briefly describe the rationale, design and development of an Iraq War PTSD VR therapy application created from assets that were initially developed for a combat tactical training simulation, which then served as the inspiration for the X-Box game entitled Full Spectrum Warrior.

Full Spectrum WarriorPsycho-therapeutic approaches to PTSD

In 1997, researchers at Georgia Tech released the first version of the Virtual Vietnam VR scenario for use as a graduated exposure therapy treatment for PTSD with Vietnam veterans. This occurred over 20 years following the end of the Vietnam War. During that interval, in spite of valiant efforts to develop and apply traditional psycho-therapeutic approaches to PTSD, the progression of the disorder in some veterans severely impaired their functional abilities and quality of life, as well as that of their family members and friends.

ptsd-disability

PTSD is the biggest contributor to the growth of a disability system in which payments have more than doubled to $49 billion since 2002.

The tragic nature of this disorder also had significant ramifications for the Veteran’s Administration healthcare delivery system often leading to designations of lifelong service connected disability status. Just recently, the first systematic study of mental health problems due to the Iraq conflict revealed that “… The percentage of study subjects whose responses met the screening criteria for major depression, generalized anxiety, or PTSD was significantly higher after duty in Iraq (15.6 to 17.1 percent) than after duty in Afghanistan (11.2 percent) or before deployment to Iraq (9.3 percent).”

With this history in mind, the USC Institute for Creative Technologies (ICT) has initiated a project that is creating an immersive virtual environment (VE) system for the treatment of Iraq War veterans diagnosed with combat-related PTSD. The treatment environment is based on a creative approach to recycling virtual assets that were initially built for a combat tactical simulation scenario entitled Full Spectrum Command, and later inspired the creation of the commercially available Xbox game, Full Spectrum Warrior.

POST TRAUMATIC STRESS DISORDER

PTSD6According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), PTSD is caused by traumatic events that are outside the range of usual human experiences such as military combat, violent personal assault, being kidnapped or taken hostage, terrorist attack, torture, incarceration as a prisoner of war, natural or man-made disasters, automobile accidents, or being diagnosed with a life-threatening illness. The disorder also appears to be more severe and longer lasting when the event is caused by human means and design (bombings, shootings, combat, etc.). Such incidents would be distressing to almost anyone, and is usually experienced with intense fear, terror, and helplessness. Typically, the initiating event involves actual or threatened death or serious injury, or other threat to one’s physical integrity; or witnessing an event that involves death, injury, or a threat to the physical integrity of another person.

Symptoms of PTSD are often intensified when the person is exposed to stimulus cues that resemble or symbolize the original trauma in a non-therapeutic setting. Such uncontrolled cue exposure may lead the person to react with a survival mentality and mode of response that could put the patient and others at considerable risk. The essential feature of PTSD is the development of characteristic symptoms that may include:

● Intrusive thoughts and flashbacks
● Anger
● Isolation
● Emotional numbing and constriction
● Anxiety
● Depression
● Substance abuse
● Survivor guilt
● Hyper-alertness
● Suicidal feelings and thoughts
● Alienation
● Negative self-image
● Memory impairment
● Problems with intimate relationships
● Emotional distance from family and others
● Denial of social problems

Imaginal Exposure Using Virtual Reality for Treating PTSD

Prior to the availability of VR therapy applications, the existing standard of care for PTSD was imaginal exposure therapy. Such treatment typically involves the graded and repeated imaginal reliving of the traumatic event within the therapeutic setting. This approach is believed to provide a low-threat context where the patient can begin to therapeutically process the emotions that are relevant to the traumatic event as well as decondition the learning cycle of the disorder via a habituation/extinction process. While the efficacy of imaginal exposure has been established in multiple studies with diverse trauma populations, many patients are unwilling or unable to effectively visualize the traumatic event. In fact, avoidance of reminders of the trauma is inherent in PTSD and is a defining symptom of the disorder.

The use and value of Virtual Reality for the treatment of cognitive, psychological and physical disorders has been well specified. The first use of VR for a Vietnam veteran with PTSD was reported in a case study of a 50-year-old, Caucasian male veteran meeting DSM-IV criteria for PTSD. Results indicated post treatment improvement on all measures of PTSD and maintenance of these gains at a 6-month follow-up. This case study was followed by an open clinical trial of VR for Vietnam veterans. In this study, 16 male PTSD patients were exposed to two Head Mounted Display (HMD)-delivered VEs, a virtual clearing surrounded by jungle scenery and a virtual Huey helicopter, in which the therapist controlled various visual and auditory effects (e.g. rockets, explosions, day/night, yelling).

After an average of 13 exposure therapy sessions over 5-7 weeks, there was a significant reduction in PTSD and related symptoms. Similar positive results have also recently been reported for VR applied to PTSD resulting from the bombing of the World Trade Center. This initial evidence suggests that VR may be a promising component of a comprehensive treatment approach for combat-related PTSD.

FULL SPECTRUM VR PTSD SCENARIO

FULL SPECTRUM VR PTSD SCENARIO

The program uses sights, sounds, even smells to evoke, and subdue, painful memories.

The aim of the current project is to use the already existing Institute for Creative Technologies (ICT) Full Spectrum Warrior graphic assets as the basis for creating a clinical VR application for the treatment of PTSD in returning Iraq War military service personnel. Thus far, a prototype VE has been created which was designed resemble a middle eastern city, and outlying village and desert areas.

The scenario will also support a variety of user perspectives including, walking alone or within a patrol, and from the vantage point of being inside a vehicle (i.e., HUMVEE, helicopter, etc.). This VE will be used initially for user testing to gather feedback to further refine the scenario. A prototype of a “wizard of oz” type clinical interface (Fig. 5) has also been created.

This interface is a key element for the application in that it will provide the clinician with the capacity to monitor a patient’s behavior and customize the therapy experience to their individual needs by placing them in VE locations that resemble the setting in which the traumatic events initially occurred. The interface also allows for the gradual introduction and control of “trigger” stimuli in the VE in real time that is required to foster the anxiety modulation needed for therapeutic habituation.

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Related:

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