Pain is a problem that has a significant effect on the quality of life, both personal and social, and in the knowledge of the authors. To date, there is no practical device or method that allows us to generate a quantitative pain index. In recent years, studies related to pain and its measurement have been reported, which have used brain activity as a biological marker of pain based on various methodologies. Therefore, the purpose of this survey article is to concentrate the tools and methods that use brain activity to study two types of physical pain: 1) chronic, as a result of a clinical condition; and, 2) acute physical induced by a painful stimulus. The survey analyzes the elements involved in evaluating these types of pain, considering the number of subjects, the EEG setting, the stimulus applied, the pain perception test used, the software for analysis and processing, and additional resources. The results present a systematic classification of the information; it contains the techniques and technologies that have been used for the study of pain. Finally, the article concludes identifying opportunity areas as quantitative pain measurement tools based on brain activity analysis to understand, adapt, or monitor the treatment responses.INDEX TERMS EEG pain, pain measurement, brain activity, chronic pain, acute pain.

The objective of this article is to present the results that can be obtained by performing brain mapping from the Emotiv EPOC + brain computer interface in conjunction with the Emotiv 3D Brain Activity Map tool. The methodology is composed of: materials used, application of tests and analysis of results. The application of tests includes the assembly and connection of the equipment, relaxation tests and physical movement tests to visualize the activation of the different areas of the brain. Likewise, the graphical interface of the program, the visualization tools and information analysis, which it provides, is presented. The results present the brain mappings obtained through the software and an analysis of the information obtained. The contribution of this applied research is to evaluate the tools that this type of commercial technology is able to provide for the incorporation of brain activity in engineering areas such as robotic rehabilitation instead of using specialized equipment that is not commonly operable by any researcher and that It can make research more expensive.