## 3 Results
### Summary of the Selected Articles
#### 3.1.5 Entertainment  
AR in the industry of entertainment (ARE) can be applied in almost any area; it can be seen mostly in games, music, sports, and videos, among others. The great part of ARE is that the user is not the observer anymore but the principal actor, which is why ARE is such an engaging feature that can become an added value component in any entertainment area. Even though AR has been proven in many fields of entertainment, in the last open access articles found, there is material dedicated to sports, educational games, and games for medical purposes, the last one being successfully applied mostly for disabilities. The mixed reality head-mounted (MRHM) game was made for attention deficit hyperactivity disorder (ADHD) in children not older than 10 years old. ADHD is a cause of poor motivation and low self-esteem, among other cognitive problems in small children [59]. In this case, the AR game was made for face recognition based on the theory that ADHD children elude eye contact, which is necessary for face recognition [60]. The AR game was demonstrated to be useful as a treatment to improve attention and impulsivity [61]. Another similar AR game was applied for children to enhance the visual perception that caused a delay in their normal development as children. In this study, 60 children between the ages of 6 and 10 were evaluated with an AR game based on kinesthetic activities that allowed children to follow different and systematic activities. This was useful for children to improve their adaptative behaviors and abilities that had to do with visual perception. The important element of the game was that the therapist could adapt the AR application according to the necessities and context of the child [62]. A third example of AR entertainment used for medical treatment purposes is in improving motor problems in patients that suffer from Parkinson's or a stroke. In this study, the potential of AR was explored to assess the speed and goal orientation of movements within the individually determined interaction space, the adaptation of hand opening to objects of different sizes, and obstacle avoidance. In the study, healthy individuals participated (N = 10) as well as individuals suffering from two highly prevalent neurological conditions (N = 10 Parkinson's disease patients and N = 10 stroke patients). Three games were successfully tested for AR assessment, where Parkinson's disease patients moved more slowly than controls and needed more time to complete the task, meanwhile, there were no differences found between stroke patients and controls. The usability of the AR system was successful, with a natural interaction adapted to the patient [63]. AR in music entertainment can be represented in an AR game adapted for dance training. In this study, there was a comparison between AR and VR-based games where there was a 3D character named [PERSON] who danced Latin music and helped users to practice their Latin dance steps. Both games (VR and AR) were tested for 18 adult participants and some characteristics considered were performance, accuracy, usability, effort used, user frustration, and how demanding was the game. The results were that VR was more successfully applied in performance, accuracy, and responsiveness, while AR had some defects in visualization and orientation [64]. In another study, there was an AR project to analyze the effects of gamified AR in public places through an application called ARQuiz, which consisted of a questionnaire displayed with question marks in AR in a museum. The study was conducted through a survey and face-to-face interviews with 231 volunteers, the analysis variables were the usefulness and enjoyment of the application, the satisfaction with the presentation, and the test. The friendliness perception and user behavior on the ride were also examined before and after exposure. The results were gratifying, improving user appreciation and understanding. However, the application intrusiveness had to be reduced [65].