## 2 Analysis of VRET Tools Used for the PTSD Treatment
### Studies Comparing VRET to Other Conditions  
Most of the studies comparing VRET to traditional exposure and other treatment conditions have highlighted the inadequacies of the latter and championed the former, leading to a necessary reconsideration of how VRET for PTSD is approached [57; 58; 59; 60; 61]. Nevertheless, although in one case, VRET was found to be superior to traditional exposure [62], other studies have demonstrated no significant differences in results between VRET and standard exposure therapy [63; 64; 60]. Furthermore, two comparative studies reported the superiority of traditional exposure over VRET [59; 65]. It is also crucial to note that in these comparative studies, abandonment cases were more visible in the VRET groups than in traditional exposure therapy [61; 65]. \begin{table}
\begin{tabular}{l l l l l l l l} \hline \hline
**Paper** & **VR System** & **Technological Devices Used** & **Sensorial Input** & **Motor Activity** \\ \hline
[7] & Virtual World Trade Center & \(\bullet\) & An HMD for visual exploration & \(\bullet\) & Visual & \(\bullet\) & Not specified \\  & & & & \(\bullet\) & Auditory & & \\ \hline
[8] & BusWorld & \(\bullet\) & An HMD for visual exploration & \(\bullet\) & Visual & \(\bullet\) & Not specified \\  & & & & \(\bullet\) & Auditory & & \\ \hline
[53] & VR system for treating victims of violent & \(\bullet\) & HMD for visual exploration & \(\bullet\) & Visual & \(\bullet\) & Navigation (device not specified) \\  & assault & \(\bullet\) & Headphones and speakers to transmit sounds & \(\bullet\) & Auditory & & \\  & & & & \(\bullet\) & Auditory & & \\ \hline
[1] & Virtual Vietnam & \(\bullet\) & An HMD for visual exploration & \(\bullet\) & Visual & & \\  & & & \(\bullet\) & Avoider to simulate vibrations & \(\bullet\) & Auditory & \\  & & & \(\bullet\) & Headphones & \(\bullet\) & Tactile & \(\bullet\) & Navigation with a joystick \\  & & & \(\bullet\) & A joystick to navigate & & & \\ \hline
[51] & Virtual System for treating victims of African & \(\bullet\) & A translucent screen and Sony XGA projector to & \(\bullet\) & Visual & & \\  & & visualize the virtual world & \(\bullet\) & Auditory & & \\  & & & \(\bullet\) & Anura twin bassed to simulate vibrations & \(\bullet\) & Tactile & & \\ \hline
[51] & Virtual Iraq & \(\bullet\) & A gamepad to navigate & \(\bullet\) & Visual & & \\  & & & \(\bullet\) & An HMD for visual exploration & \(\bullet\) & Auditory & \\  & & & \(\bullet\) & A scent palette to distill smells & \(\bullet\) & Tactile & \(\bullet\) & Navigation with a gamepad \\  & & & Sound transducer to simulate vibrations & \(\bullet\) & Olfactory & & \\ \hline
[6] & BRAVEMIND & \(\bullet\) & A gamepad to navigate & \(\bullet\) & Visual & & \\  & & & \(\bullet\) & An HMD for visual exploration & \(\bullet\) & Auditory & \\  & & & \(\bullet\) & A scent palette to distill smells & \(\bullet\) & Tactile & \(\bullet\) & Navigation with a gamepad \\  & & & \(\bullet\) & Sound transducer to simulate vibrations & \(\bullet\) & Olfactory & \\ \hline
[34] & BRAVEMIND-MST & \(\bullet\) & The same as in BRAVEMIND & \(\bullet\) & The same as in BRAVEMIND & \(\bullet\) & The same as in BRAVEMIND \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Summary of the review of virtual reality tools exploited in the treatment of post-traumatic stress disorder.