5 types of brain waves

I started to look for the meaning of theta state relating to mediation and the trance state, then in order to understand what the theta state refers to, I get myself educated on the different types of brain waves.  As living human beings, we all have brain waves, otherwise they would have declared us dead! There are mainly 5 types of brain waves, here is the list from the highest frequency to the lowest: Gamma, Beta, Alpha, Theta and Delta. 

THis is a very long English word, right? haha. As I like to simply and get the structure out of things that seem complcated, I like to write the word by grouping its meaningful syllable Electro-Encephalo-Graph. It's just a tool to measure brain waves and of course, to see if you are dead or alive at crucial times! 

Our ability to transition from different brain wave frequencies plays an important role in our daily lives, whether it's about stress management, sleep quality or concentration level in work, study, sport perfomance, etc. For example, people who have (ADHD Attention Deficit Hyperactivity Disorder) demonstrate an unhealthy dominant brain waves.