Motivation graph

In many researches, it has been found that attention in class starts high, then it diminishes in the middle of the class time and finally attention raises again close to the end of the class.
This can help teachers to organise a more effective class creating some warm-up to introduce the topic (quite calm), making more dynamic activities in the middle of the session to keep students' attention and finally, implementing a cool-down to relax before finishing the class